diff --git a/instrumentation/ratpack-1.4/ratpack-1.4.gradle b/instrumentation/ratpack-1.5/ratpack-1.5.gradle
similarity index 73%
rename from instrumentation/ratpack-1.4/ratpack-1.4.gradle
rename to instrumentation/ratpack-1.5/ratpack-1.5.gradle
index c669a26494..f9adf743af 100644
--- a/instrumentation/ratpack-1.4/ratpack-1.4.gradle
+++ b/instrumentation/ratpack-1.5/ratpack-1.5.gradle
@@ -11,13 +11,9 @@ muzzle {
   pass {
     group = "io.ratpack"
     module = 'ratpack-core'
-    versions = "[1.4.0,)"
-  }
-  // Some maven dependencies are missing for pre 1.0 ratpack, so we can't assertInverse.
-  fail {
-    group = "io.ratpack"
-    module = 'ratpack-core'
-    versions = "[1.0,1.4.0)"
+    versions = "[1.5.0,)"
+    skipVersions += ["0.9.12", "0.9.13", "0.9.14",]
+    assertInverse = true
   }
 }
 
@@ -28,9 +24,9 @@ testSets {
 }
 
 dependencies {
-  main_java8CompileOnly group: 'io.ratpack', name: 'ratpack-core', version: '1.4.0'
+  main_java8CompileOnly group: 'io.ratpack', name: 'ratpack-core', version: '1.5.0'
 
   testCompile project(':instrumentation:netty:netty-4.1')
-  testCompile group: 'io.ratpack', name: 'ratpack-groovy-test', version: '1.4.0'
+  testCompile group: 'io.ratpack', name: 'ratpack-groovy-test', version: '1.5.0'
   latestDepTestCompile group: 'io.ratpack', name: 'ratpack-groovy-test', version: '+'
 }
diff --git a/instrumentation/ratpack-1.4/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/ContinuationInstrumentation.java b/instrumentation/ratpack-1.5/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/ContinuationInstrumentation.java
similarity index 92%
rename from instrumentation/ratpack-1.4/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/ContinuationInstrumentation.java
rename to instrumentation/ratpack-1.5/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/ContinuationInstrumentation.java
index fbbf54f6fc..6c79174d57 100644
--- a/instrumentation/ratpack-1.4/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/ContinuationInstrumentation.java
+++ b/instrumentation/ratpack-1.5/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/ContinuationInstrumentation.java
@@ -23,6 +23,7 @@ import static net.bytebuddy.matcher.ElementMatchers.named;
 import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
 
 import com.google.auto.service.AutoService;
+import com.google.common.net.HostAndPort;
 import io.opentelemetry.auto.tooling.Instrumenter;
 import java.util.Map;
 import net.bytebuddy.asm.Advice;
@@ -70,9 +71,12 @@ public final class ContinuationInstrumentation extends Instrumenter.Default {
       block = BlockWrapper.wrapIfNeeded(block);
     }
 
-    public void muzzleCheck(final PathBinding binding) {
+    public void muzzleCheck(final PathBinding binding, final HostAndPort host) {
       // This was added in 1.4.  Added here to ensure consistency with other instrumentation.
       binding.getDescription();
+
+      // This is available in Guava 20 which was required starting in 1.5
+      host.getHost();
     }
   }
 }
diff --git a/instrumentation/ratpack-1.4/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/DefaultExecutionInstrumentation.java b/instrumentation/ratpack-1.5/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/DefaultExecutionInstrumentation.java
similarity index 92%
rename from instrumentation/ratpack-1.4/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/DefaultExecutionInstrumentation.java
rename to instrumentation/ratpack-1.5/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/DefaultExecutionInstrumentation.java
index fa2a8f9770..3fe5ed16de 100644
--- a/instrumentation/ratpack-1.4/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/DefaultExecutionInstrumentation.java
+++ b/instrumentation/ratpack-1.5/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/DefaultExecutionInstrumentation.java
@@ -21,6 +21,7 @@ import static net.bytebuddy.matcher.ElementMatchers.named;
 import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
 
 import com.google.auto.service.AutoService;
+import com.google.common.net.HostAndPort;
 import io.opentelemetry.auto.tooling.Instrumenter;
 import java.util.Map;
 import net.bytebuddy.asm.Advice;
@@ -67,9 +68,12 @@ public final class DefaultExecutionInstrumentation extends Instrumenter.Default
       segment = ActionWrapper.wrapIfNeeded(segment);
     }
 
-    public void muzzleCheck(final PathBinding binding) {
+    public void muzzleCheck(final PathBinding binding, final HostAndPort host) {
       // This was added in 1.4.  Added here to ensure consistency with other instrumentation.
       binding.getDescription();
+
+      // This is available in Guava 20 which was required starting in 1.5
+      host.getHost();
     }
   }
 }
diff --git a/instrumentation/ratpack-1.4/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/ServerErrorHandlerInstrumentation.java b/instrumentation/ratpack-1.5/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/ServerErrorHandlerInstrumentation.java
similarity index 100%
rename from instrumentation/ratpack-1.4/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/ServerErrorHandlerInstrumentation.java
rename to instrumentation/ratpack-1.5/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/ServerErrorHandlerInstrumentation.java
diff --git a/instrumentation/ratpack-1.4/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/ServerRegistryInstrumentation.java b/instrumentation/ratpack-1.5/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/ServerRegistryInstrumentation.java
similarity index 100%
rename from instrumentation/ratpack-1.4/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/ServerRegistryInstrumentation.java
rename to instrumentation/ratpack-1.5/src/main/java/io/opentelemetry/auto/instrumentation/ratpack/ServerRegistryInstrumentation.java
diff --git a/instrumentation/ratpack-1.4/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/ActionWrapper.java b/instrumentation/ratpack-1.5/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/ActionWrapper.java
similarity index 100%
rename from instrumentation/ratpack-1.4/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/ActionWrapper.java
rename to instrumentation/ratpack-1.5/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/ActionWrapper.java
diff --git a/instrumentation/ratpack-1.4/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/BlockWrapper.java b/instrumentation/ratpack-1.5/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/BlockWrapper.java
similarity index 100%
rename from instrumentation/ratpack-1.4/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/BlockWrapper.java
rename to instrumentation/ratpack-1.5/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/BlockWrapper.java
diff --git a/instrumentation/ratpack-1.4/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/ErrorHandlerAdvice.java b/instrumentation/ratpack-1.5/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/ErrorHandlerAdvice.java
similarity index 100%
rename from instrumentation/ratpack-1.4/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/ErrorHandlerAdvice.java
rename to instrumentation/ratpack-1.5/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/ErrorHandlerAdvice.java
diff --git a/instrumentation/ratpack-1.4/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/RatpackServerDecorator.java b/instrumentation/ratpack-1.5/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/RatpackServerDecorator.java
similarity index 98%
rename from instrumentation/ratpack-1.4/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/RatpackServerDecorator.java
rename to instrumentation/ratpack-1.5/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/RatpackServerDecorator.java
index 297622d930..a98dfa8a0c 100644
--- a/instrumentation/ratpack-1.4/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/RatpackServerDecorator.java
+++ b/instrumentation/ratpack-1.5/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/RatpackServerDecorator.java
@@ -54,7 +54,7 @@ public class RatpackServerDecorator extends HttpServerDecorator<Request, Request
 
   @Override
   protected String peerHostIP(final Request request) {
-    return request.getRemoteAddress().getHostText();
+    return request.getRemoteAddress().getHost();
   }
 
   @Override
diff --git a/instrumentation/ratpack-1.4/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/ServerRegistryAdvice.java b/instrumentation/ratpack-1.5/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/ServerRegistryAdvice.java
similarity index 100%
rename from instrumentation/ratpack-1.4/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/ServerRegistryAdvice.java
rename to instrumentation/ratpack-1.5/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/ServerRegistryAdvice.java
diff --git a/instrumentation/ratpack-1.4/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/TracingHandler.java b/instrumentation/ratpack-1.5/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/TracingHandler.java
similarity index 100%
rename from instrumentation/ratpack-1.4/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/TracingHandler.java
rename to instrumentation/ratpack-1.5/src/main/java8/io/opentelemetry/auto/instrumentation/ratpack/TracingHandler.java
diff --git a/instrumentation/ratpack-1.4/src/test/groovy/RatpackOtherTest.groovy b/instrumentation/ratpack-1.5/src/test/groovy/RatpackOtherTest.groovy
similarity index 100%
rename from instrumentation/ratpack-1.4/src/test/groovy/RatpackOtherTest.groovy
rename to instrumentation/ratpack-1.5/src/test/groovy/RatpackOtherTest.groovy
diff --git a/instrumentation/ratpack-1.4/src/test/groovy/client/RatpackForkedHttpClientTest.groovy b/instrumentation/ratpack-1.5/src/test/groovy/client/RatpackForkedHttpClientTest.groovy
similarity index 100%
rename from instrumentation/ratpack-1.4/src/test/groovy/client/RatpackForkedHttpClientTest.groovy
rename to instrumentation/ratpack-1.5/src/test/groovy/client/RatpackForkedHttpClientTest.groovy
diff --git a/instrumentation/ratpack-1.4/src/test/groovy/client/RatpackHttpClientTest.groovy b/instrumentation/ratpack-1.5/src/test/groovy/client/RatpackHttpClientTest.groovy
similarity index 100%
rename from instrumentation/ratpack-1.4/src/test/groovy/client/RatpackHttpClientTest.groovy
rename to instrumentation/ratpack-1.5/src/test/groovy/client/RatpackHttpClientTest.groovy
diff --git a/instrumentation/ratpack-1.4/src/test/groovy/server/NettyServerTestInstrumentation.java b/instrumentation/ratpack-1.5/src/test/groovy/server/NettyServerTestInstrumentation.java
similarity index 100%
rename from instrumentation/ratpack-1.4/src/test/groovy/server/NettyServerTestInstrumentation.java
rename to instrumentation/ratpack-1.5/src/test/groovy/server/NettyServerTestInstrumentation.java
diff --git a/instrumentation/ratpack-1.4/src/test/groovy/server/RatpackAsyncHttpServerTest.groovy b/instrumentation/ratpack-1.5/src/test/groovy/server/RatpackAsyncHttpServerTest.groovy
similarity index 100%
rename from instrumentation/ratpack-1.4/src/test/groovy/server/RatpackAsyncHttpServerTest.groovy
rename to instrumentation/ratpack-1.5/src/test/groovy/server/RatpackAsyncHttpServerTest.groovy
diff --git a/instrumentation/ratpack-1.4/src/test/groovy/server/RatpackForkedHttpServerTest.groovy b/instrumentation/ratpack-1.5/src/test/groovy/server/RatpackForkedHttpServerTest.groovy
similarity index 100%
rename from instrumentation/ratpack-1.4/src/test/groovy/server/RatpackForkedHttpServerTest.groovy
rename to instrumentation/ratpack-1.5/src/test/groovy/server/RatpackForkedHttpServerTest.groovy
diff --git a/instrumentation/ratpack-1.4/src/test/groovy/server/RatpackHttpServerTest.groovy b/instrumentation/ratpack-1.5/src/test/groovy/server/RatpackHttpServerTest.groovy
similarity index 100%
rename from instrumentation/ratpack-1.4/src/test/groovy/server/RatpackHttpServerTest.groovy
rename to instrumentation/ratpack-1.5/src/test/groovy/server/RatpackHttpServerTest.groovy
diff --git a/settings.gradle b/settings.gradle
index 690fee0392..733ee9b9ef 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -120,7 +120,7 @@ include ':instrumentation:play-ws:play-ws-2.0'
 include ':instrumentation:play-ws:play-ws-2.1'
 include ':instrumentation:play-ws:play-ws-common'
 include ':instrumentation:rabbitmq-amqp-2.7'
-include ':instrumentation:ratpack-1.4'
+include ':instrumentation:ratpack-1.5'
 include ':instrumentation:reactor-3.1'
 include ':instrumentation:rmi'
 include ':instrumentation:rxjava-1.0'