diff --git a/CHANGELOG.md b/CHANGELOG.md
index 95154f66f..ea9f61ccf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 # Change Log
 
+## [1.2.51](https://github.com/ably/ably-java/tree/v1.2.51)
+
+[Full Changelog](https://github.com/ably/ably-java/compare/v1.2.50...v1.2.51)
+
+**Implemented enhancements:**
+
+- Made query params URL-encoded in the request API by default [\#1075](https://github.com/ably/ably-java/issues/1075)
+- Implemented RTN11d spec point [\#1074](https://github.com/ably/ably-java/issues/1074)
+
 ## [1.2.50](https://github.com/ably/ably-java/tree/v1.2.50)
 
 [Full Changelog](https://github.com/ably/ably-java/compare/v1.2.49...v1.2.50)
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index a65faaf8e..e845d3bc3 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -215,7 +215,7 @@ You may wish to make changes to Ably Java or Ably Android, and test it immediate
 - Open the directory printed from the output of that command. Inside that folder, get the `ably-android-x.y.z.aar`, and place it your Android project's `libs/` directory. Create this directory if it doesn't exist.
 - Add an `implementation` dependency on the `.aar`:
 ```groovy
-implementation files('libs/ably-android-1.2.50.aar')
+implementation files('libs/ably-android-1.2.51.aar')
 ```
 - Add the `implementation` (not `testImplementation`) dependencies found in `dependencies.gradle` to your project. This is because the `.aar` does not contain dependencies.
 - Build/run your application.
diff --git a/README.md b/README.md
index 666351ccd..fcb623531 100644
--- a/README.md
+++ b/README.md
@@ -20,13 +20,13 @@ Include the library by adding an `implementation` reference to `dependencies` bl
 For [Java](https://mvnrepository.com/artifact/io.ably/ably-java/latest):
 
 ```groovy
-implementation 'io.ably:ably-java:1.2.50'
+implementation 'io.ably:ably-java:1.2.51'
 ```
 
 For [Android](https://mvnrepository.com/artifact/io.ably/ably-android/latest):
 
 ```groovy
-implementation 'io.ably:ably-android:1.2.50'
+implementation 'io.ably:ably-android:1.2.51'
 ```
 
 The library is hosted on [Maven Central](https://mvnrepository.com/repos/central), so you need to ensure that the repository is referenced also; IDEs will typically include this by default:
@@ -512,7 +512,7 @@ Add the following dependency to your `build.gradle` file:
 
 ```groovy
 dependencies {
-    runtimeOnly("io.ably:network-client-okhttp:1.2.50")
+    runtimeOnly("io.ably:network-client-okhttp:1.2.51")
 }
 ```
 
diff --git a/gradle.properties b/gradle.properties
index 42052c5de..ce3a70bc2 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,5 +1,5 @@
 GROUP=io.ably
-VERSION_NAME=1.2.50
+VERSION_NAME=1.2.51
 POM_INCEPTION_YEAR=2015
 POM_URL=https://github.com/ably/ably-java
 POM_SCM_URL=https://github.com/ably/ably-java/
diff --git a/lib/src/test/java/io/ably/lib/test/realtime/RealtimeHttpHeaderTest.java b/lib/src/test/java/io/ably/lib/test/realtime/RealtimeHttpHeaderTest.java
index 8f672ff28..915b36251 100644
--- a/lib/src/test/java/io/ably/lib/test/realtime/RealtimeHttpHeaderTest.java
+++ b/lib/src/test/java/io/ably/lib/test/realtime/RealtimeHttpHeaderTest.java
@@ -88,7 +88,7 @@ public void realtime_websocket_param_test() {
              * Defaults.ABLY_AGENT_PARAM, as ultimately the request param has been derived from those values.
              */
             assertEquals("Verify correct lib version", requestParameters.get("agent"),
-                    Collections.singletonList("ably-java/1.2.50 jre/" + System.getProperty("java.version")));
+                    Collections.singletonList("ably-java/1.2.51 jre/" + System.getProperty("java.version")));
 
             /* Spec RTN2a */
             assertEquals("Verify correct format", requestParameters.get("format"),