diff --git a/MODULE.bazel b/MODULE.bazel
index 2b5d85490f..8260788c5c 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -2,7 +2,7 @@ module(
     name = "grpc-java",
     compatibility_level = 0,
     repo_name = "io_grpc_grpc_java",
-    version = "1.67.0-SNAPSHOT",  # CURRENT_GRPC_VERSION
+    version = "1.66.0-SNAPSHOT",  # CURRENT_GRPC_VERSION
 )
 
 # GRPC_DEPS_START
@@ -22,20 +22,20 @@ IO_GRPC_GRPC_JAVA_ARTIFACTS = [
     "com.google.truth:truth:1.4.2",
     "com.squareup.okhttp:okhttp:2.7.5",
     "com.squareup.okio:okio:2.10.0",  # 3.0+ needs swapping to -jvm; need work to avoid flag-day
-    "io.netty:netty-buffer:4.1.100.Final",
-    "io.netty:netty-codec-http2:4.1.100.Final",
-    "io.netty:netty-codec-http:4.1.100.Final",
-    "io.netty:netty-codec-socks:4.1.100.Final",
-    "io.netty:netty-codec:4.1.100.Final",
-    "io.netty:netty-common:4.1.100.Final",
-    "io.netty:netty-handler-proxy:4.1.100.Final",
-    "io.netty:netty-handler:4.1.100.Final",
-    "io.netty:netty-resolver:4.1.100.Final",
-    "io.netty:netty-tcnative-boringssl-static:2.0.61.Final",
-    "io.netty:netty-tcnative-classes:2.0.61.Final",
-    "io.netty:netty-transport-native-epoll:jar:linux-x86_64:4.1.100.Final",
-    "io.netty:netty-transport-native-unix-common:4.1.100.Final",
-    "io.netty:netty-transport:4.1.100.Final",
+    "io.netty:netty-buffer:4.1.110.Final",
+    "io.netty:netty-codec-http2:4.1.110.Final",
+    "io.netty:netty-codec-http:4.1.110.Final",
+    "io.netty:netty-codec-socks:4.1.110.Final",
+    "io.netty:netty-codec:4.1.110.Final",
+    "io.netty:netty-common:4.1.110.Final",
+    "io.netty:netty-handler-proxy:4.1.110.Final",
+    "io.netty:netty-handler:4.1.110.Final",
+    "io.netty:netty-resolver:4.1.110.Final",
+    "io.netty:netty-tcnative-boringssl-static:2.0.65.Final",
+    "io.netty:netty-tcnative-classes:2.0.65.Final",
+    "io.netty:netty-transport-native-epoll:jar:linux-x86_64:4.1.110.Final",
+    "io.netty:netty-transport-native-unix-common:4.1.110.Final",
+    "io.netty:netty-transport:4.1.110.Final",
     "io.opencensus:opencensus-api:0.31.0",
     "io.opencensus:opencensus-contrib-grpc-metrics:0.31.0",
     "io.perfmark:perfmark-api:0.27.0",
diff --git a/README.md b/README.md
index fef37c1c3b..cb38ad6639 100644
--- a/README.md
+++ b/README.md
@@ -44,8 +44,8 @@ For a guided tour, take a look at the [quick start
 guide](https://grpc.io/docs/languages/java/quickstart) or the more explanatory [gRPC
 basics](https://grpc.io/docs/languages/java/basics).
 
-The [examples](https://github.com/grpc/grpc-java/tree/v1.65.0/examples) and the
-[Android example](https://github.com/grpc/grpc-java/tree/v1.65.0/examples/android)
+The [examples](https://github.com/grpc/grpc-java/tree/v1.66.0/examples) and the
+[Android example](https://github.com/grpc/grpc-java/tree/v1.66.0/examples/android)
 are standalone projects that showcase the usage of gRPC.
 
 Download
@@ -56,18 +56,18 @@ Download [the JARs][]. Or for Maven with non-Android, add to your `pom.xml`:
 <dependency>
   <groupId>io.grpc</groupId>
   <artifactId>grpc-netty-shaded</artifactId>
-  <version>1.65.0</version>
+  <version>1.66.0</version>
   <scope>runtime</scope>
 </dependency>
 <dependency>
   <groupId>io.grpc</groupId>
   <artifactId>grpc-protobuf</artifactId>
-  <version>1.65.0</version>
+  <version>1.66.0</version>
 </dependency>
 <dependency>
   <groupId>io.grpc</groupId>
   <artifactId>grpc-stub</artifactId>
-  <version>1.65.0</version>
+  <version>1.66.0</version>
 </dependency>
 <dependency> <!-- necessary for Java 9+ -->
   <groupId>org.apache.tomcat</groupId>
@@ -79,18 +79,18 @@ Download [the JARs][]. Or for Maven with non-Android, add to your `pom.xml`:
 
 Or for Gradle with non-Android, add to your dependencies:
 ```gradle
-runtimeOnly 'io.grpc:grpc-netty-shaded:1.65.0'
-implementation 'io.grpc:grpc-protobuf:1.65.0'
-implementation 'io.grpc:grpc-stub:1.65.0'
+runtimeOnly 'io.grpc:grpc-netty-shaded:1.66.0'
+implementation 'io.grpc:grpc-protobuf:1.66.0'
+implementation 'io.grpc:grpc-stub:1.66.0'
 compileOnly 'org.apache.tomcat:annotations-api:6.0.53' // necessary for Java 9+
 ```
 
 For Android client, use `grpc-okhttp` instead of `grpc-netty-shaded` and
 `grpc-protobuf-lite` instead of `grpc-protobuf`:
 ```gradle
-implementation 'io.grpc:grpc-okhttp:1.65.0'
-implementation 'io.grpc:grpc-protobuf-lite:1.65.0'
-implementation 'io.grpc:grpc-stub:1.65.0'
+implementation 'io.grpc:grpc-okhttp:1.66.0'
+implementation 'io.grpc:grpc-protobuf-lite:1.66.0'
+implementation 'io.grpc:grpc-stub:1.66.0'
 compileOnly 'org.apache.tomcat:annotations-api:6.0.53' // necessary for Java 9+
 ```
 
@@ -99,7 +99,7 @@ For [Bazel](https://bazel.build), you can either
 (with the GAVs from above), or use `@io_grpc_grpc_java//api` et al (see below).
 
 [the JARs]:
-https://search.maven.org/search?q=g:io.grpc%20AND%20v:1.65.0
+https://search.maven.org/search?q=g:io.grpc%20AND%20v:1.66.0
 
 Development snapshots are available in [Sonatypes's snapshot
 repository](https://oss.sonatype.org/content/repositories/snapshots/).
@@ -129,9 +129,9 @@ For protobuf-based codegen integrated with the Maven build system, you can use
       <artifactId>protobuf-maven-plugin</artifactId>
       <version>0.6.1</version>
       <configuration>
-        <protocArtifact>com.google.protobuf:protoc:3.25.1:exe:${os.detected.classifier}</protocArtifact>
+        <protocArtifact>com.google.protobuf:protoc:3.25.3:exe:${os.detected.classifier}</protocArtifact>
         <pluginId>grpc-java</pluginId>
-        <pluginArtifact>io.grpc:protoc-gen-grpc-java:1.65.0:exe:${os.detected.classifier}</pluginArtifact>
+        <pluginArtifact>io.grpc:protoc-gen-grpc-java:1.66.0:exe:${os.detected.classifier}</pluginArtifact>
       </configuration>
       <executions>
         <execution>
@@ -157,11 +157,11 @@ plugins {
 
 protobuf {
   protoc {
-    artifact = "com.google.protobuf:protoc:3.25.1"
+    artifact = "com.google.protobuf:protoc:3.25.3"
   }
   plugins {
     grpc {
-      artifact = 'io.grpc:protoc-gen-grpc-java:1.65.0'
+      artifact = 'io.grpc:protoc-gen-grpc-java:1.66.0'
     }
   }
   generateProtoTasks {
@@ -190,11 +190,11 @@ plugins {
 
 protobuf {
   protoc {
-    artifact = "com.google.protobuf:protoc:3.25.1"
+    artifact = "com.google.protobuf:protoc:3.25.3"
   }
   plugins {
     grpc {
-      artifact = 'io.grpc:protoc-gen-grpc-java:1.65.0'
+      artifact = 'io.grpc:protoc-gen-grpc-java:1.66.0'
     }
   }
   generateProtoTasks {
diff --git a/SECURITY.md b/SECURITY.md
index 774579bf68..47b54f1ef4 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -398,7 +398,8 @@ grpc-netty version | netty-handler version | netty-tcnative-boringssl-static ver
 1.56.x             | 4.1.87.Final          | 2.0.61.Final
 1.57.x-1.58.x      | 4.1.93.Final          | 2.0.61.Final
 1.59.x             | 4.1.97.Final          | 2.0.61.Final
-1.60.x-            | 4.1.100.Final         | 2.0.61.Final
+1.60.x-1.65.x      | 4.1.100.Final         | 2.0.61.Final
+1.66.x-            | 4.1.110.Final         | 2.0.65.Final
 
 _(grpc-netty-shaded avoids issues with keeping these versions in sync.)_
 
diff --git a/build.gradle b/build.gradle
index 74cfacb800..76449ec010 100644
--- a/build.gradle
+++ b/build.gradle
@@ -21,7 +21,7 @@ subprojects {
     apply plugin: "net.ltgt.errorprone"
 
     group = "io.grpc"
-    version = "1.67.0-SNAPSHOT" // CURRENT_GRPC_VERSION
+    version = "1.66.0-SNAPSHOT" // CURRENT_GRPC_VERSION
 
     repositories {
         maven { // The google mirror is less flaky than mavenCentral()
diff --git a/compiler/src/test/golden/TestDeprecatedService.java.txt b/compiler/src/test/golden/TestDeprecatedService.java.txt
index 75e9e0b47e..5666abe8fd 100644
--- a/compiler/src/test/golden/TestDeprecatedService.java.txt
+++ b/compiler/src/test/golden/TestDeprecatedService.java.txt
@@ -8,7 +8,7 @@ import static io.grpc.MethodDescriptor.generateFullMethodName;
  * </pre>
  */
 @javax.annotation.Generated(
-    value = "by gRPC proto compiler (version 1.67.0-SNAPSHOT)",
+    value = "by gRPC proto compiler (version 1.66.0-SNAPSHOT)",
     comments = "Source: grpc/testing/compiler/test.proto")
 @io.grpc.stub.annotations.GrpcGenerated
 @java.lang.Deprecated
diff --git a/compiler/src/test/golden/TestService.java.txt b/compiler/src/test/golden/TestService.java.txt
index 3852b6ee54..52e2a77241 100644
--- a/compiler/src/test/golden/TestService.java.txt
+++ b/compiler/src/test/golden/TestService.java.txt
@@ -8,7 +8,7 @@ import static io.grpc.MethodDescriptor.generateFullMethodName;
  * </pre>
  */
 @javax.annotation.Generated(
-    value = "by gRPC proto compiler (version 1.67.0-SNAPSHOT)",
+    value = "by gRPC proto compiler (version 1.66.0-SNAPSHOT)",
     comments = "Source: grpc/testing/compiler/test.proto")
 @io.grpc.stub.annotations.GrpcGenerated
 public final class TestServiceGrpc {
diff --git a/core/src/main/java/io/grpc/internal/GrpcUtil.java b/core/src/main/java/io/grpc/internal/GrpcUtil.java
index 593bdbce13..fa488f30ef 100644
--- a/core/src/main/java/io/grpc/internal/GrpcUtil.java
+++ b/core/src/main/java/io/grpc/internal/GrpcUtil.java
@@ -219,7 +219,7 @@ public final class GrpcUtil {
 
   public static final Splitter ACCEPT_ENCODING_SPLITTER = Splitter.on(',').trimResults();
 
-  public static final String IMPLEMENTATION_VERSION = "1.67.0-SNAPSHOT"; // CURRENT_GRPC_VERSION
+  public static final String IMPLEMENTATION_VERSION = "1.66.0-SNAPSHOT"; // CURRENT_GRPC_VERSION
 
   /**
    * The default timeout in nanos for a keepalive ping request.
diff --git a/examples/android/clientcache/app/build.gradle b/examples/android/clientcache/app/build.gradle
index 0ca032fb0e..64e95de473 100644
--- a/examples/android/clientcache/app/build.gradle
+++ b/examples/android/clientcache/app/build.gradle
@@ -34,7 +34,7 @@ android {
 protobuf {
     protoc { artifact = 'com.google.protobuf:protoc:3.25.1' }
     plugins {
-        grpc { artifact = 'io.grpc:protoc-gen-grpc-java:1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+        grpc { artifact = 'io.grpc:protoc-gen-grpc-java:1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
         }
     }
     generateProtoTasks {
@@ -54,12 +54,12 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.0.0'
 
     // You need to build grpc-java to obtain these libraries below.
-    implementation 'io.grpc:grpc-okhttp:1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
-    implementation 'io.grpc:grpc-protobuf-lite:1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
-    implementation 'io.grpc:grpc-stub:1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+    implementation 'io.grpc:grpc-okhttp:1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+    implementation 'io.grpc:grpc-protobuf-lite:1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+    implementation 'io.grpc:grpc-stub:1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
     implementation 'org.apache.tomcat:annotations-api:6.0.53'
 
     testImplementation 'junit:junit:4.13.2'
     testImplementation 'com.google.truth:truth:1.1.5'
-    testImplementation 'io.grpc:grpc-testing:1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+    testImplementation 'io.grpc:grpc-testing:1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
 }
diff --git a/examples/android/helloworld/app/build.gradle b/examples/android/helloworld/app/build.gradle
index 0f1e8b4047..f9433f1401 100644
--- a/examples/android/helloworld/app/build.gradle
+++ b/examples/android/helloworld/app/build.gradle
@@ -32,7 +32,7 @@ android {
 protobuf {
     protoc { artifact = 'com.google.protobuf:protoc:3.25.1' }
     plugins {
-        grpc { artifact = 'io.grpc:protoc-gen-grpc-java:1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+        grpc { artifact = 'io.grpc:protoc-gen-grpc-java:1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
         }
     }
     generateProtoTasks {
@@ -52,8 +52,8 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.0.0'
 
     // You need to build grpc-java to obtain these libraries below.
-    implementation 'io.grpc:grpc-okhttp:1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
-    implementation 'io.grpc:grpc-protobuf-lite:1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
-    implementation 'io.grpc:grpc-stub:1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+    implementation 'io.grpc:grpc-okhttp:1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+    implementation 'io.grpc:grpc-protobuf-lite:1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+    implementation 'io.grpc:grpc-stub:1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
     implementation 'org.apache.tomcat:annotations-api:6.0.53'
 }
diff --git a/examples/android/routeguide/app/build.gradle b/examples/android/routeguide/app/build.gradle
index c33135233e..2431b473f2 100644
--- a/examples/android/routeguide/app/build.gradle
+++ b/examples/android/routeguide/app/build.gradle
@@ -32,7 +32,7 @@ android {
 protobuf {
     protoc { artifact = 'com.google.protobuf:protoc:3.25.1' }
     plugins {
-        grpc { artifact = 'io.grpc:protoc-gen-grpc-java:1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+        grpc { artifact = 'io.grpc:protoc-gen-grpc-java:1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
         }
     }
     generateProtoTasks {
@@ -52,8 +52,8 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.0.0'
 
     // You need to build grpc-java to obtain these libraries below.
-    implementation 'io.grpc:grpc-okhttp:1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
-    implementation 'io.grpc:grpc-protobuf-lite:1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
-    implementation 'io.grpc:grpc-stub:1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+    implementation 'io.grpc:grpc-okhttp:1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+    implementation 'io.grpc:grpc-protobuf-lite:1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+    implementation 'io.grpc:grpc-stub:1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
     implementation 'org.apache.tomcat:annotations-api:6.0.53'
 }
diff --git a/examples/android/strictmode/app/build.gradle b/examples/android/strictmode/app/build.gradle
index e8e2e8cac2..699c8dd9d6 100644
--- a/examples/android/strictmode/app/build.gradle
+++ b/examples/android/strictmode/app/build.gradle
@@ -33,7 +33,7 @@ android {
 protobuf {
     protoc { artifact = 'com.google.protobuf:protoc:3.25.1' }
     plugins {
-        grpc { artifact = 'io.grpc:protoc-gen-grpc-java:1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+        grpc { artifact = 'io.grpc:protoc-gen-grpc-java:1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
         }
     }
     generateProtoTasks {
@@ -53,8 +53,8 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.0.0'
 
     // You need to build grpc-java to obtain these libraries below.
-    implementation 'io.grpc:grpc-okhttp:1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
-    implementation 'io.grpc:grpc-protobuf-lite:1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
-    implementation 'io.grpc:grpc-stub:1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+    implementation 'io.grpc:grpc-okhttp:1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+    implementation 'io.grpc:grpc-protobuf-lite:1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+    implementation 'io.grpc:grpc-stub:1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
     implementation 'org.apache.tomcat:annotations-api:6.0.53'
 }
diff --git a/examples/build.gradle b/examples/build.gradle
index 076e0c4a25..c9213cc6a2 100644
--- a/examples/build.gradle
+++ b/examples/build.gradle
@@ -23,7 +23,7 @@ java {
 
 // Feel free to delete the comment at the next line. It is just for safely
 // updating the version in our release process.
-def grpcVersion = '1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+def grpcVersion = '1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
 def protobufVersion = '3.25.3'
 def protocVersion = protobufVersion
 
diff --git a/examples/example-alts/build.gradle b/examples/example-alts/build.gradle
index 3c998586bb..06b7ac501d 100644
--- a/examples/example-alts/build.gradle
+++ b/examples/example-alts/build.gradle
@@ -24,7 +24,7 @@ java {
 
 // Feel free to delete the comment at the next line. It is just for safely
 // updating the version in our release process.
-def grpcVersion = '1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+def grpcVersion = '1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
 def protocVersion = '3.25.3'
 
 dependencies {
diff --git a/examples/example-debug/build.gradle b/examples/example-debug/build.gradle
index ca151a13c1..624483f663 100644
--- a/examples/example-debug/build.gradle
+++ b/examples/example-debug/build.gradle
@@ -25,7 +25,7 @@ java {
 
 // Feel free to delete the comment at the next line. It is just for safely
 // updating the version in our release process.
-def grpcVersion = '1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+def grpcVersion = '1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
 def protobufVersion = '3.25.3'
 
 dependencies {
diff --git a/examples/example-debug/pom.xml b/examples/example-debug/pom.xml
index 10ccf834d8..5aa8065ad3 100644
--- a/examples/example-debug/pom.xml
+++ b/examples/example-debug/pom.xml
@@ -6,13 +6,13 @@
   <packaging>jar</packaging>
   <!-- Feel free to delete the comment at the end of these lines. It is just
        for safely updating the version in our release process. -->
-  <version>1.67.0-SNAPSHOT</version><!-- CURRENT_GRPC_VERSION -->
+  <version>1.66.0-SNAPSHOT</version><!-- CURRENT_GRPC_VERSION -->
   <name>example-debug</name>
   <url>https://github.com/grpc/grpc-java</url>
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <grpc.version>1.67.0-SNAPSHOT</grpc.version><!-- CURRENT_GRPC_VERSION -->
+    <grpc.version>1.66.0-SNAPSHOT</grpc.version><!-- CURRENT_GRPC_VERSION -->
     <protoc.version>3.25.3</protoc.version>
     <!-- required for jdk9 -->
     <maven.compiler.source>1.8</maven.compiler.source>
diff --git a/examples/example-gauth/build.gradle b/examples/example-gauth/build.gradle
index 40e72afad8..c43443c386 100644
--- a/examples/example-gauth/build.gradle
+++ b/examples/example-gauth/build.gradle
@@ -24,7 +24,7 @@ java {
 
 // Feel free to delete the comment at the next line. It is just for safely
 // updating the version in our release process.
-def grpcVersion = '1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+def grpcVersion = '1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
 def protobufVersion = '3.25.3'
 def protocVersion = protobufVersion
 
diff --git a/examples/example-gauth/pom.xml b/examples/example-gauth/pom.xml
index 1e58e21e97..d91eeb15de 100644
--- a/examples/example-gauth/pom.xml
+++ b/examples/example-gauth/pom.xml
@@ -6,13 +6,13 @@
   <packaging>jar</packaging>
   <!-- Feel free to delete the comment at the end of these lines. It is just
        for safely updating the version in our release process. -->
-  <version>1.67.0-SNAPSHOT</version><!-- CURRENT_GRPC_VERSION -->
+  <version>1.66.0-SNAPSHOT</version><!-- CURRENT_GRPC_VERSION -->
   <name>example-gauth</name>
   <url>https://github.com/grpc/grpc-java</url>
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <grpc.version>1.67.0-SNAPSHOT</grpc.version><!-- CURRENT_GRPC_VERSION -->
+    <grpc.version>1.66.0-SNAPSHOT</grpc.version><!-- CURRENT_GRPC_VERSION -->
     <protobuf.version>3.25.3</protobuf.version>
     <!-- required for jdk9 -->
     <maven.compiler.source>1.8</maven.compiler.source>
diff --git a/examples/example-gcp-csm-observability/build.gradle b/examples/example-gcp-csm-observability/build.gradle
index 5de2b1995e..a24490918b 100644
--- a/examples/example-gcp-csm-observability/build.gradle
+++ b/examples/example-gcp-csm-observability/build.gradle
@@ -25,7 +25,7 @@ java {
 
 // Feel free to delete the comment at the next line. It is just for safely
 // updating the version in our release process.
-def grpcVersion = '1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+def grpcVersion = '1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
 def protocVersion = '3.25.3'
 def openTelemetryVersion = '1.40.0'
 def openTelemetryPrometheusVersion = '1.40.0-alpha'
diff --git a/examples/example-gcp-observability/build.gradle b/examples/example-gcp-observability/build.gradle
index 0462c987f5..d6dd1aedc6 100644
--- a/examples/example-gcp-observability/build.gradle
+++ b/examples/example-gcp-observability/build.gradle
@@ -25,7 +25,7 @@ java {
 
 // Feel free to delete the comment at the next line. It is just for safely
 // updating the version in our release process.
-def grpcVersion = '1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+def grpcVersion = '1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
 def protocVersion = '3.25.3'
 
 dependencies {
diff --git a/examples/example-hostname/build.gradle b/examples/example-hostname/build.gradle
index ab45ee2dc5..ee5e5cf5c7 100644
--- a/examples/example-hostname/build.gradle
+++ b/examples/example-hostname/build.gradle
@@ -23,7 +23,7 @@ java {
 
 // Feel free to delete the comment at the next line. It is just for safely
 // updating the version in our release process.
-def grpcVersion = '1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+def grpcVersion = '1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
 def protobufVersion = '3.25.3'
 
 dependencies {
diff --git a/examples/example-hostname/pom.xml b/examples/example-hostname/pom.xml
index 19b5f8b3c2..05131b8997 100644
--- a/examples/example-hostname/pom.xml
+++ b/examples/example-hostname/pom.xml
@@ -6,13 +6,13 @@
   <packaging>jar</packaging>
   <!-- Feel free to delete the comment at the end of these lines. It is just
        for safely updating the version in our release process. -->
-  <version>1.67.0-SNAPSHOT</version><!-- CURRENT_GRPC_VERSION -->
+  <version>1.66.0-SNAPSHOT</version><!-- CURRENT_GRPC_VERSION -->
   <name>example-hostname</name>
   <url>https://github.com/grpc/grpc-java</url>
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <grpc.version>1.67.0-SNAPSHOT</grpc.version><!-- CURRENT_GRPC_VERSION -->
+    <grpc.version>1.66.0-SNAPSHOT</grpc.version><!-- CURRENT_GRPC_VERSION -->
     <protoc.version>3.25.3</protoc.version>
     <!-- required for jdk9 -->
     <maven.compiler.source>1.8</maven.compiler.source>
diff --git a/examples/example-jwt-auth/build.gradle b/examples/example-jwt-auth/build.gradle
index 6fdd4498c7..2ad3c91f19 100644
--- a/examples/example-jwt-auth/build.gradle
+++ b/examples/example-jwt-auth/build.gradle
@@ -23,7 +23,7 @@ java {
 
 // Feel free to delete the comment at the next line. It is just for safely
 // updating the version in our release process.
-def grpcVersion = '1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+def grpcVersion = '1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
 def protobufVersion = '3.25.3'
 def protocVersion = protobufVersion
 
diff --git a/examples/example-jwt-auth/pom.xml b/examples/example-jwt-auth/pom.xml
index ad530e33aa..01cf0edce2 100644
--- a/examples/example-jwt-auth/pom.xml
+++ b/examples/example-jwt-auth/pom.xml
@@ -7,13 +7,13 @@
   <packaging>jar</packaging>
   <!-- Feel free to delete the comment at the end of these lines. It is just
        for safely updating the version in our release process. -->
-  <version>1.67.0-SNAPSHOT</version><!-- CURRENT_GRPC_VERSION -->
+  <version>1.66.0-SNAPSHOT</version><!-- CURRENT_GRPC_VERSION -->
   <name>example-jwt-auth</name>
   <url>https://github.com/grpc/grpc-java</url>
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <grpc.version>1.67.0-SNAPSHOT</grpc.version><!-- CURRENT_GRPC_VERSION -->
+    <grpc.version>1.66.0-SNAPSHOT</grpc.version><!-- CURRENT_GRPC_VERSION -->
     <protobuf.version>3.25.3</protobuf.version>
     <protoc.version>3.25.3</protoc.version>
     <!-- required for jdk9 -->
diff --git a/examples/example-oauth/build.gradle b/examples/example-oauth/build.gradle
index 255633b4f9..23a6633e26 100644
--- a/examples/example-oauth/build.gradle
+++ b/examples/example-oauth/build.gradle
@@ -23,7 +23,7 @@ java {
 
 // Feel free to delete the comment at the next line. It is just for safely
 // updating the version in our release process.
-def grpcVersion = '1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+def grpcVersion = '1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
 def protobufVersion = '3.25.3'
 def protocVersion = protobufVersion
 
diff --git a/examples/example-oauth/pom.xml b/examples/example-oauth/pom.xml
index 2c38a05b3e..afd45aecd3 100644
--- a/examples/example-oauth/pom.xml
+++ b/examples/example-oauth/pom.xml
@@ -7,13 +7,13 @@
   <packaging>jar</packaging>
   <!-- Feel free to delete the comment at the end of these lines. It is just
        for safely updating the version in our release process. -->
-  <version>1.67.0-SNAPSHOT</version><!-- CURRENT_GRPC_VERSION -->
+  <version>1.66.0-SNAPSHOT</version><!-- CURRENT_GRPC_VERSION -->
   <name>example-oauth</name>
   <url>https://github.com/grpc/grpc-java</url>
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <grpc.version>1.67.0-SNAPSHOT</grpc.version><!-- CURRENT_GRPC_VERSION -->
+    <grpc.version>1.66.0-SNAPSHOT</grpc.version><!-- CURRENT_GRPC_VERSION -->
     <protobuf.version>3.25.3</protobuf.version>
     <protoc.version>3.25.3</protoc.version>
     <!-- required for jdk9 -->
diff --git a/examples/example-opentelemetry/build.gradle b/examples/example-opentelemetry/build.gradle
index 00f7dc101b..55d6685d77 100644
--- a/examples/example-opentelemetry/build.gradle
+++ b/examples/example-opentelemetry/build.gradle
@@ -24,7 +24,7 @@ java {
 
 // Feel free to delete the comment at the next line. It is just for safely
 // updating the version in our release process.
-def grpcVersion = '1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+def grpcVersion = '1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
 def protocVersion = '3.25.3'
 def openTelemetryVersion = '1.40.0'
 def openTelemetryPrometheusVersion = '1.40.0-alpha'
diff --git a/examples/example-orca/build.gradle b/examples/example-orca/build.gradle
index 22feb8cae4..f3eae10ace 100644
--- a/examples/example-orca/build.gradle
+++ b/examples/example-orca/build.gradle
@@ -18,7 +18,7 @@ java {
     targetCompatibility = JavaVersion.VERSION_1_8
 }
 
-def grpcVersion = '1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+def grpcVersion = '1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
 def protocVersion = '3.25.3'
 
 dependencies {
diff --git a/examples/example-reflection/build.gradle b/examples/example-reflection/build.gradle
index 7882139191..0b5c99898e 100644
--- a/examples/example-reflection/build.gradle
+++ b/examples/example-reflection/build.gradle
@@ -18,7 +18,7 @@ java {
     targetCompatibility = JavaVersion.VERSION_1_8
 }
 
-def grpcVersion = '1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+def grpcVersion = '1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
 def protocVersion = '3.25.3'
 
 dependencies {
diff --git a/examples/example-servlet/build.gradle b/examples/example-servlet/build.gradle
index 9542ba0277..b73d21fbc4 100644
--- a/examples/example-servlet/build.gradle
+++ b/examples/example-servlet/build.gradle
@@ -16,7 +16,7 @@ java {
     targetCompatibility = JavaVersion.VERSION_1_8
 }
 
-def grpcVersion = '1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+def grpcVersion = '1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
 def protocVersion = '3.25.3'
 
 dependencies {
diff --git a/examples/example-tls/build.gradle b/examples/example-tls/build.gradle
index 94257af475..3791cc0327 100644
--- a/examples/example-tls/build.gradle
+++ b/examples/example-tls/build.gradle
@@ -24,7 +24,7 @@ java {
 
 // Feel free to delete the comment at the next line. It is just for safely
 // updating the version in our release process.
-def grpcVersion = '1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+def grpcVersion = '1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
 def protocVersion = '3.25.3'
 
 dependencies {
diff --git a/examples/example-tls/pom.xml b/examples/example-tls/pom.xml
index bc9c0a7a8e..1263b34703 100644
--- a/examples/example-tls/pom.xml
+++ b/examples/example-tls/pom.xml
@@ -6,13 +6,13 @@
   <packaging>jar</packaging>
   <!-- Feel free to delete the comment at the end of these lines. It is just
        for safely updating the version in our release process. -->
-  <version>1.67.0-SNAPSHOT</version><!-- CURRENT_GRPC_VERSION -->
+  <version>1.66.0-SNAPSHOT</version><!-- CURRENT_GRPC_VERSION -->
   <name>example-tls</name>
   <url>https://github.com/grpc/grpc-java</url>
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <grpc.version>1.67.0-SNAPSHOT</grpc.version><!-- CURRENT_GRPC_VERSION -->
+    <grpc.version>1.66.0-SNAPSHOT</grpc.version><!-- CURRENT_GRPC_VERSION -->
     <protoc.version>3.25.3</protoc.version>
     <!-- required for jdk9 -->
     <maven.compiler.source>1.8</maven.compiler.source>
diff --git a/examples/example-xds/build.gradle b/examples/example-xds/build.gradle
index 2554adb003..9807b1f8b7 100644
--- a/examples/example-xds/build.gradle
+++ b/examples/example-xds/build.gradle
@@ -23,7 +23,7 @@ java {
 
 // Feel free to delete the comment at the next line. It is just for safely
 // updating the version in our release process.
-def grpcVersion = '1.67.0-SNAPSHOT' // CURRENT_GRPC_VERSION
+def grpcVersion = '1.66.0-SNAPSHOT' // CURRENT_GRPC_VERSION
 def protocVersion = '3.25.3'
 
 dependencies {
diff --git a/examples/pom.xml b/examples/pom.xml
index 2b25d13b50..a71e9d449c 100644
--- a/examples/pom.xml
+++ b/examples/pom.xml
@@ -6,13 +6,13 @@
   <packaging>jar</packaging>
   <!-- Feel free to delete the comment at the end of these lines. It is just
        for safely updating the version in our release process. -->
-  <version>1.67.0-SNAPSHOT</version><!-- CURRENT_GRPC_VERSION -->
+  <version>1.66.0-SNAPSHOT</version><!-- CURRENT_GRPC_VERSION -->
   <name>examples</name>
   <url>https://github.com/grpc/grpc-java</url>
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <grpc.version>1.67.0-SNAPSHOT</grpc.version><!-- CURRENT_GRPC_VERSION -->
+    <grpc.version>1.66.0-SNAPSHOT</grpc.version><!-- CURRENT_GRPC_VERSION -->
     <protobuf.version>3.25.3</protobuf.version>
     <protoc.version>3.25.3</protoc.version>
     <!-- required for JDK 8 -->
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 78550e9c95..4eee9a6018 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,8 +1,9 @@
 [versions]
-netty = '4.1.100.Final'
+googleauth = "1.22.0"
+netty = '4.1.110.Final'
 # Keep the following references of tcnative version in sync whenever it's updated:
 #   SECURITY.md
-nettytcnative = '2.0.61.Final'
+nettytcnative = '2.0.65.Final'
 opencensus = "0.31.1"
 # Not upgrading to 4.x as it is not yet ABI compatible.
 # https://github.com/protocolbuffers/protobuf/issues/17247
diff --git a/netty/shaded/src/testShadow/java/io/grpc/netty/shaded/ShadingTest.java b/netty/shaded/src/testShadow/java/io/grpc/netty/shaded/ShadingTest.java
index 7a5e4b43c8..8980399892 100644
--- a/netty/shaded/src/testShadow/java/io/grpc/netty/shaded/ShadingTest.java
+++ b/netty/shaded/src/testShadow/java/io/grpc/netty/shaded/ShadingTest.java
@@ -79,7 +79,7 @@ public final class ShadingTest {
     InputStream inputStream = NettyChannelBuilder.class.getClassLoader()
         .getResourceAsStream(
             "META-INF/native-image/io.grpc.netty.shaded.io.netty/netty-transport/"
-                + "reflection-config.json");
+                + "reflect-config.json");
     assertThat(inputStream).isNotNull();
 
     Scanner s = new Scanner(inputStream, StandardCharsets.UTF_8.name()).useDelimiter("\\A");
diff --git a/repositories.bzl b/repositories.bzl
index af3acc8ddc..455e9dcf3c 100644
--- a/repositories.bzl
+++ b/repositories.bzl
@@ -26,20 +26,20 @@ IO_GRPC_GRPC_JAVA_ARTIFACTS = [
     "com.google.truth:truth:1.4.2",
     "com.squareup.okhttp:okhttp:2.7.5",
     "com.squareup.okio:okio:2.10.0",  # 3.0+ needs swapping to -jvm; need work to avoid flag-day
-    "io.netty:netty-buffer:4.1.100.Final",
-    "io.netty:netty-codec-http2:4.1.100.Final",
-    "io.netty:netty-codec-http:4.1.100.Final",
-    "io.netty:netty-codec-socks:4.1.100.Final",
-    "io.netty:netty-codec:4.1.100.Final",
-    "io.netty:netty-common:4.1.100.Final",
-    "io.netty:netty-handler-proxy:4.1.100.Final",
-    "io.netty:netty-handler:4.1.100.Final",
-    "io.netty:netty-resolver:4.1.100.Final",
-    "io.netty:netty-tcnative-boringssl-static:2.0.61.Final",
-    "io.netty:netty-tcnative-classes:2.0.61.Final",
-    "io.netty:netty-transport-native-epoll:jar:linux-x86_64:4.1.100.Final",
-    "io.netty:netty-transport-native-unix-common:4.1.100.Final",
-    "io.netty:netty-transport:4.1.100.Final",
+    "io.netty:netty-buffer:4.1.110.Final",
+    "io.netty:netty-codec-http2:4.1.110.Final",
+    "io.netty:netty-codec-http:4.1.110.Final",
+    "io.netty:netty-codec-socks:4.1.110.Final",
+    "io.netty:netty-codec:4.1.110.Final",
+    "io.netty:netty-common:4.1.110.Final",
+    "io.netty:netty-handler-proxy:4.1.110.Final",
+    "io.netty:netty-handler:4.1.110.Final",
+    "io.netty:netty-resolver:4.1.110.Final",
+    "io.netty:netty-tcnative-boringssl-static:2.0.65.Final",
+    "io.netty:netty-tcnative-classes:2.0.65.Final",
+    "io.netty:netty-transport-native-epoll:jar:linux-x86_64:4.1.110.Final",
+    "io.netty:netty-transport-native-unix-common:4.1.110.Final",
+    "io.netty:netty-transport:4.1.110.Final",
     "io.opencensus:opencensus-api:0.31.0",
     "io.opencensus:opencensus-contrib-grpc-metrics:0.31.0",
     "io.perfmark:perfmark-api:0.27.0",