diff --git a/.circleci/config.yml b/.circleci/config.yml
index 16c3a22e65..f72cd345f7 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -25,7 +25,7 @@ jobs:
 
     - run:
         name: Build Project
-        command: GRADLE_OPTS="-Dorg.gradle.jvmargs='-Xmx1G -Xms64M' -Ddatadog.forkedMaxHeapSize=1G -Ddatadog.forkedMinHeapSize=64M" ./gradlew clean :dd-java-agent:shadowJar compileTestGroovy compileTestScala compileTestJava --build-cache --parallel --stacktrace --no-daemon --max-workers=8
+        command: GRADLE_OPTS="-Dorg.gradle.jvmargs='-Xmx1G -Xms64M' -Ddatadog.forkedMaxHeapSize=1G -Ddatadog.forkedMinHeapSize=64M" ./gradlew clean :dd-java-agent:shadowJar compileTestGroovy compileLatestDepTestGroovy compileTestScala compileLatestDepTestScala compileTestJava compileLatestDepTestJava --build-cache --parallel --stacktrace --no-daemon --max-workers=8
 
     - run:
         name: Collect Libs
diff --git a/dd-java-agent/instrumentation/apache-httpasyncclient-4/src/test/groovy/ApacheHttpAsyncClientNullCallbackTest.groovy b/dd-java-agent/instrumentation/apache-httpasyncclient-4/src/test/groovy/ApacheHttpAsyncClientNullCallbackTest.groovy
index 2015e4956e..ea8e04521b 100644
--- a/dd-java-agent/instrumentation/apache-httpasyncclient-4/src/test/groovy/ApacheHttpAsyncClientNullCallbackTest.groovy
+++ b/dd-java-agent/instrumentation/apache-httpasyncclient-4/src/test/groovy/ApacheHttpAsyncClientNullCallbackTest.groovy
@@ -1,5 +1,6 @@
 import datadog.trace.agent.test.base.HttpClientTest
 import datadog.trace.instrumentation.apachehttpasyncclient.ApacheHttpAsyncClientDecorator
+import io.opentracing.util.GlobalTracer
 import org.apache.http.client.methods.HttpGet
 import org.apache.http.impl.nio.client.HttpAsyncClients
 import org.apache.http.message.BasicHeader
@@ -33,6 +34,10 @@ class ApacheHttpAsyncClientNullCallbackTest extends HttpClientTest<ApacheHttpAsy
     Future future = client.execute(request, null)
     future.get()
     if (callback != null) {
+      // Request span is closed asynchronously even in regards to returned future so we have to wait here.
+      if (GlobalTracer.get().activeSpan() != null) {
+        blockUntilChildSpansFinished(1)
+      }
       callback()
     }
     return 200
diff --git a/dd-java-agent/instrumentation/couchbase-2.0/couchbase-2.0.gradle b/dd-java-agent/instrumentation/couchbase-2.0/couchbase-2.0.gradle
index f7d0d30511..15960d93d8 100644
--- a/dd-java-agent/instrumentation/couchbase-2.0/couchbase-2.0.gradle
+++ b/dd-java-agent/instrumentation/couchbase-2.0/couchbase-2.0.gradle
@@ -17,8 +17,15 @@ muzzle {
   pass {
     group = 'com.couchbase.client'
     module = 'java-client'
-    versions = "[2.0.0,)"
-    assertInverse = true
+    // Looks like 2.7.5 was just released and didn't sync up with mirrors properly causing build failures
+    // TODO: remove this on a few days.
+    versions = "[2.0.0,2.7.5)"
+//    assertInverse = true
+  }
+  fail {
+    group = 'com.couchbase.client'
+    module = 'java-client'
+    versions = "(,2.0.0)"
   }
   fail {
     group = 'com.couchbase.client'
@@ -46,6 +53,8 @@ dependencies {
   testCompile group: 'com.couchbase.client', name: 'java-client', version: '2.5.0'
 
   latestDepTestCompile group: 'org.springframework.data', name: 'spring-data-couchbase', version: '3.+'
-  latestDepTestCompile group: 'com.couchbase.client', name: 'java-client', version: '2.6+'
-  latestDepTestCompile group: 'com.couchbase.client', name: 'encryption', version: '+'
+  // Looks like 2.7.5 was just released and didn't sync up with mirrors properly causing build failures
+  // TODO: remove this on a few days.
+  latestDepTestCompile group: 'com.couchbase.client', name: 'java-client', version: '2.7.4'
+  latestDepTestCompile group: 'com.couchbase.client', name: 'encryption', version: '1.0.0'
 }
diff --git a/dd-java-agent/instrumentation/kafka-clients-0.11/src/main/java/datadog/trace/instrumentation/kafka_clients/KafkaProducerInstrumentation.java b/dd-java-agent/instrumentation/kafka-clients-0.11/src/main/java/datadog/trace/instrumentation/kafka_clients/KafkaProducerInstrumentation.java
index 4e29178577..a0c8d7f4c1 100644
--- a/dd-java-agent/instrumentation/kafka-clients-0.11/src/main/java/datadog/trace/instrumentation/kafka_clients/KafkaProducerInstrumentation.java
+++ b/dd-java-agent/instrumentation/kafka-clients-0.11/src/main/java/datadog/trace/instrumentation/kafka_clients/KafkaProducerInstrumentation.java
@@ -17,9 +17,11 @@ import net.bytebuddy.asm.Advice;
 import net.bytebuddy.description.method.MethodDescription;
 import net.bytebuddy.description.type.TypeDescription;
 import net.bytebuddy.matcher.ElementMatcher;
+import org.apache.kafka.clients.ApiVersions;
 import org.apache.kafka.clients.producer.Callback;
 import org.apache.kafka.clients.producer.ProducerRecord;
 import org.apache.kafka.clients.producer.RecordMetadata;
+import org.apache.kafka.common.record.RecordBatch;
 
 @AutoService(Instrumenter.class)
 public final class KafkaProducerInstrumentation extends Instrumenter.Default {
@@ -61,6 +63,7 @@ public final class KafkaProducerInstrumentation extends Instrumenter.Default {
 
     @Advice.OnMethodEnter(suppress = Throwable.class)
     public static Scope startSpan(
+        @Advice.FieldValue("apiVersions") final ApiVersions apiVersions,
         @Advice.Argument(value = 0, readOnly = false) ProducerRecord record,
         @Advice.Argument(value = 1, readOnly = false) Callback callback) {
       final Scope scope = GlobalTracer.get().buildSpan("kafka.produce").startActive(false);
@@ -69,28 +72,33 @@ public final class KafkaProducerInstrumentation extends Instrumenter.Default {
 
       callback = new ProducerCallback(callback, scope);
 
-      try {
-        GlobalTracer.get()
-            .inject(
-                scope.span().context(),
-                Format.Builtin.TEXT_MAP,
-                new TextMapInjectAdapter(record.headers()));
-      } catch (final IllegalStateException e) {
-        // headers must be read-only from reused record. try again with new one.
-        record =
-            new ProducerRecord<>(
-                record.topic(),
-                record.partition(),
-                record.timestamp(),
-                record.key(),
-                record.value(),
-                record.headers());
+      // Do not inject headers for batch versions below 2
+      // This is how similar check is being done in Kafka client itself:
+      // https://github.com/apache/kafka/blob/05fcfde8f69b0349216553f711fdfc3f0259c601/clients/src/main/java/org/apache/kafka/common/record/MemoryRecordsBuilder.java#L411-L412
+      if (apiVersions.maxUsableProduceMagic() >= RecordBatch.MAGIC_VALUE_V2) {
+        try {
+          GlobalTracer.get()
+              .inject(
+                  scope.span().context(),
+                  Format.Builtin.TEXT_MAP,
+                  new TextMapInjectAdapter(record.headers()));
+        } catch (final IllegalStateException e) {
+          // headers must be read-only from reused record. try again with new one.
+          record =
+              new ProducerRecord<>(
+                  record.topic(),
+                  record.partition(),
+                  record.timestamp(),
+                  record.key(),
+                  record.value(),
+                  record.headers());
 
-        GlobalTracer.get()
-            .inject(
-                scope.span().context(),
-                Format.Builtin.TEXT_MAP,
-                new TextMapInjectAdapter(record.headers()));
+          GlobalTracer.get()
+              .inject(
+                  scope.span().context(),
+                  Format.Builtin.TEXT_MAP,
+                  new TextMapInjectAdapter(record.headers()));
+        }
       }
 
       return scope;