diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 061f355bf3a..24b1176fb1d 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.55.0"
+  ".": "1.56.0"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 44d0903fdea..011172819c1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [1.56.0](https://github.com/googleapis/java-genai/compare/v1.55.0...v1.56.0) (2026-05-22)
+
+
+### Features
+
+* Support Reinforcement Tuning in GenAI SDK ([c0248fb](https://github.com/googleapis/java-genai/commit/c0248fb0c957457f9bdedc2695dd8177eaa8a514))
+
 ## [1.55.0](https://github.com/googleapis/java-genai/compare/v1.54.0...v1.55.0) (2026-05-21)
 
 
diff --git a/README.md b/README.md
index 1a99d00d9e5..e83e8b1f641 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ If you're using Maven, add the following to your dependencies:
   <dependency>
     <groupId>com.google.genai</groupId>
     <artifactId>google-genai</artifactId>
-    <version>1.55.0</version>
+    <version>1.56.0</version>
   </dependency>
 </dependencies>
 ```
diff --git a/examples/pom.xml b/examples/pom.xml
index 0982fcb2c7e..62e1c30932c 100644
--- a/examples/pom.xml
+++ b/examples/pom.xml
@@ -5,7 +5,7 @@
 
   <groupId>com.google.genai.examples</groupId>
   <artifactId>google-genai-examples</artifactId>
-  <version>1.56.0-SNAPSHOT</version><!-- {x-version-update:google-genai:current} -->
+  <version>1.56.0</version><!-- {x-version-update:google-genai:current} -->
   <name>google-genai-examples</name>
 
   <properties>
@@ -13,7 +13,7 @@
     <maven.compiler.source>1.8</maven.compiler.source>
     <maven.compiler.target>1.8</maven.compiler.target>
     <!-- {x-version-update-start:google-genai:current} -->
-    <google-genai.version>1.56.0-SNAPSHOT</google-genai.version>
+    <google-genai.version>1.56.0</google-genai.version>
     <!-- {x-version-update-end} -->
   </properties>
   <build>
diff --git a/pom.xml b/pom.xml
index 8660941721e..3b1088773e2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
   <groupId>com.google.genai</groupId>
   <artifactId>google-genai</artifactId>
   <name>google-genai</name>
-  <version>1.56.0-SNAPSHOT</version><!-- {x-version-update:google-genai:current} -->
+  <version>1.56.0</version><!-- {x-version-update:google-genai:current} -->
   <packaging>jar</packaging>
   <description>
     Java idiomatic SDK for the Gemini Developer APIs and Vertex AI APIs.
diff --git a/src/main/java/com/google/genai/ApiClient.java b/src/main/java/com/google/genai/ApiClient.java
index f4506c492cb..1bdba99d11c 100644
--- a/src/main/java/com/google/genai/ApiClient.java
+++ b/src/main/java/com/google/genai/ApiClient.java
@@ -58,7 +58,7 @@
 public abstract class ApiClient implements AutoCloseable {
 
   // {x-version-update-start:google-genai:released}
-  private static final String SDK_VERSION = "1.55.0";
+  private static final String SDK_VERSION = "1.56.0";
   // {x-version-update-end:google-genai:released}
   private static final Logger logger = Logger.getLogger(ApiClient.class.getName());
 
@@ -656,9 +656,9 @@ private Optional<Map<String, String>> getTimeoutHeader(HttpOptions httpOptionsTo
    * Merges two user agent values, handling a special case for vertex-genai-modules.
    *
    * <p>Example:
-   * <li>val1 = google-genai-sdk/1.55.0 gl-java/22.0.2
-   * <li>val2 = vertex-genai-modules/1.55.0
-   * <li>Result: google-genai-sdk/1.55.0+vertex-genai-modules/1.2.3 gl-java/22.0.2
+   * <li>val1 = google-genai-sdk/1.56.0 gl-java/22.0.2
+   * <li>val2 = vertex-genai-modules/1.56.0
+   * <li>Result: google-genai-sdk/1.56.0+vertex-genai-modules/1.2.3 gl-java/22.0.2
    *
    * @param val1 The first value.
    * @param val2 The second value.
diff --git a/versions.txt b/versions.txt
index 1b51d42031a..aa8900b4e22 100644
--- a/versions.txt
+++ b/versions.txt
@@ -1,4 +1,4 @@
 # Format:
 # module:released-version:current-version
 
-google-genai:1.55.0:1.56.0-SNAPSHOT
\ No newline at end of file
+google-genai:1.56.0:1.56.0
\ No newline at end of file