diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index a1961ec9a..09a252282 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-    ".": "1.1.0"
+    ".": "1.2.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 43ffbbfae..616fe2f71 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,26 @@
 # Changelog
 
+## [1.2.0](https://github.com/google/adk-java/compare/v1.1.0...v1.2.0) (2026-04-23)
+
+
+### Features
+
+* Add telemetry headers ([4009905](https://github.com/google/adk-java/commit/40099057e2b59f34e868da4c34dcd9c1194b2fde))
+* Allowing McpAsycToolset Builder to take in a McpSessionManager ([78766c1](https://github.com/google/adk-java/commit/78766c179192ff8e560502e0365b45f87ecac433))
+* Forward state delta from all events to parent session instead of just the last event ([f4cd1b7](https://github.com/google/adk-java/commit/f4cd1b754b62fcbf82da22aabc695911d416e51a))
+* Implement BigQuery auto-schema upgrade and view creation ([14027d1](https://github.com/google/adk-java/commit/14027d1545237675a507706d792825356575f73c))
+* Make BigQueryAgentAnalyticsPlugin state per-invocation ([629c390](https://github.com/google/adk-java/commit/629c390de9ca0ec49cba18a0689d299f9261c1fa))
+* Support ChatCompletionChunk to LlmResponse conversion ([589328e](https://github.com/google/adk-java/commit/589328ea747ad4a994223af5789320e171ea2aa7))
+* Support plugins in Java AgentTool similar to Python's implementation ([02a08a1](https://github.com/google/adk-java/commit/02a08a10f087975491d55a29329d6011362925ce))
+
+
+### Bug Fixes
+
+* Allow BuiltInCodeExecutor for Gemini 3 models ([1a3dd61](https://github.com/google/adk-java/commit/1a3dd612217a05e2f8fff69720087ed1136a09ab))
+* Fix ADK Runner race condition for sequential tool execution ([69680bb](https://github.com/google/adk-java/commit/69680bbeae11578199eca4efcaf5ecddea2dd552))
+* Fix ADK Runner race condition for sequential tool execution ([9031cad](https://github.com/google/adk-java/commit/9031cadc0e53cad8e4fe141e1d9d2bb19a431a12))
+* Removing deprecated Optional methods ([8ef99f9](https://github.com/google/adk-java/commit/8ef99f999c11c1dbf3331563a0566e14188a68f2))
+
 ## [1.1.0](https://github.com/google/adk-java/compare/v1.0.0...v1.1.0) (2026-04-10)
 
 
diff --git a/README.md b/README.md
index a2337bf55..107a6967b 100644
--- a/README.md
+++ b/README.md
@@ -50,13 +50,13 @@ If you're using Maven, add the following to your dependencies:
 <dependency>
   <groupId>com.google.adk</groupId>
   <artifactId>google-adk</artifactId>
-  <version>1.1.0</version>
+  <version>1.2.0</version>
 </dependency>
 <!-- Dev UI -->
 <dependency>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-dev</artifactId>
-    <version>1.1.0</version>
+    <version>1.2.0</version>
 </dependency>
 ```
 
diff --git a/a2a/pom.xml b/a2a/pom.xml
index d4bbf6855..1d5cf5a90 100644
--- a/a2a/pom.xml
+++ b/a2a/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-parent</artifactId>
-    <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
   </parent>
 
   <artifactId>google-adk-a2a</artifactId>
diff --git a/contrib/firestore-session-service/pom.xml b/contrib/firestore-session-service/pom.xml
index d327032b8..5864a6d4f 100644
--- a/contrib/firestore-session-service/pom.xml
+++ b/contrib/firestore-session-service/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <groupId>com.google.adk</groupId>
         <artifactId>google-adk-parent</artifactId>
-        <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>../../pom.xml</relativePath>
     </parent>
 
diff --git a/contrib/langchain4j/pom.xml b/contrib/langchain4j/pom.xml
index eec1bf3de..d5cf4dc63 100644
--- a/contrib/langchain4j/pom.xml
+++ b/contrib/langchain4j/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <groupId>com.google.adk</groupId>
         <artifactId>google-adk-parent</artifactId>
-        <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>../../pom.xml</relativePath>
     </parent>
 
diff --git a/contrib/planners/pom.xml b/contrib/planners/pom.xml
index 64bef2249..50cb91bc9 100644
--- a/contrib/planners/pom.xml
+++ b/contrib/planners/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <groupId>com.google.adk</groupId>
         <artifactId>google-adk-parent</artifactId>
-        <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>../../pom.xml</relativePath>
     </parent>
 
diff --git a/contrib/samples/a2a_basic/pom.xml b/contrib/samples/a2a_basic/pom.xml
index 9484a5cc9..e12ca09a1 100644
--- a/contrib/samples/a2a_basic/pom.xml
+++ b/contrib/samples/a2a_basic/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-samples</artifactId>
-    <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
     <relativePath>..</relativePath>
   </parent>
 
diff --git a/contrib/samples/a2a_server/pom.xml b/contrib/samples/a2a_server/pom.xml
index 17489b57e..6a7e87ef4 100644
--- a/contrib/samples/a2a_server/pom.xml
+++ b/contrib/samples/a2a_server/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-samples</artifactId>
-    <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
     <relativePath>..</relativePath>
   </parent>
 
diff --git a/contrib/samples/configagent/pom.xml b/contrib/samples/configagent/pom.xml
index fa8e5872d..db7bde0c5 100644
--- a/contrib/samples/configagent/pom.xml
+++ b/contrib/samples/configagent/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <groupId>com.google.adk</groupId>
         <artifactId>google-adk-samples</artifactId>
-        <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>..</relativePath>
     </parent>
 
diff --git a/contrib/samples/helloworld/pom.xml b/contrib/samples/helloworld/pom.xml
index a65b669ca..1ff79260f 100644
--- a/contrib/samples/helloworld/pom.xml
+++ b/contrib/samples/helloworld/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <groupId>com.google.adk</groupId>
         <artifactId>google-adk-samples</artifactId>
-        <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>..</relativePath>
     </parent>
 
diff --git a/contrib/samples/mcpfilesystem/pom.xml b/contrib/samples/mcpfilesystem/pom.xml
index 0c5cb6de0..ce6c2afc8 100644
--- a/contrib/samples/mcpfilesystem/pom.xml
+++ b/contrib/samples/mcpfilesystem/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <groupId>com.google.adk</groupId>
         <artifactId>google-adk-parent</artifactId>
-        <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>../../..</relativePath>
     </parent>
 
diff --git a/contrib/samples/pom.xml b/contrib/samples/pom.xml
index aba48ed04..8978fa2c4 100644
--- a/contrib/samples/pom.xml
+++ b/contrib/samples/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-parent</artifactId>
-    <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
     <relativePath>../..</relativePath>
   </parent>
 
diff --git a/contrib/spring-ai/pom.xml b/contrib/spring-ai/pom.xml
index 687933860..a64c22793 100644
--- a/contrib/spring-ai/pom.xml
+++ b/contrib/spring-ai/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <groupId>com.google.adk</groupId>
         <artifactId>google-adk-parent</artifactId>
-        <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>../../pom.xml</relativePath>
     </parent>
 
diff --git a/core/pom.xml b/core/pom.xml
index 9bd42df81..30b8760a8 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-parent</artifactId>
-    <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
   </parent>
 
   <artifactId>google-adk</artifactId>
diff --git a/core/src/main/java/com/google/adk/Version.java b/core/src/main/java/com/google/adk/Version.java
index 4c5a6b1a9..2816d6763 100644
--- a/core/src/main/java/com/google/adk/Version.java
+++ b/core/src/main/java/com/google/adk/Version.java
@@ -22,7 +22,7 @@
  */
 public final class Version {
   // Don't touch this, release-please should keep it up to date.
-  public static final String JAVA_ADK_VERSION = "1.1.0"; // x-release-please-released-version
+  public static final String JAVA_ADK_VERSION = "1.2.0"; // x-release-please-released-version
 
   private Version() {}
 }
diff --git a/dev/pom.xml b/dev/pom.xml
index b1de29cf3..32cfa6441 100644
--- a/dev/pom.xml
+++ b/dev/pom.xml
@@ -18,7 +18,7 @@
   <parent>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-parent</artifactId>
-    <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
   </parent>
 
   <artifactId>google-adk-dev</artifactId>
diff --git a/maven_plugin/examples/custom_tools/pom.xml b/maven_plugin/examples/custom_tools/pom.xml
index 1d7cc2bce..910e74439 100644
--- a/maven_plugin/examples/custom_tools/pom.xml
+++ b/maven_plugin/examples/custom_tools/pom.xml
@@ -4,7 +4,7 @@
 
     <groupId>com.example</groupId>
     <artifactId>custom-tools-example</artifactId>
-    <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
     <packaging>jar</packaging>
 
     <name>ADK Custom Tools Example</name>
diff --git a/maven_plugin/examples/simple-agent/pom.xml b/maven_plugin/examples/simple-agent/pom.xml
index d1221bc75..17256f364 100644
--- a/maven_plugin/examples/simple-agent/pom.xml
+++ b/maven_plugin/examples/simple-agent/pom.xml
@@ -4,7 +4,7 @@
 
     <groupId>com.example</groupId>
     <artifactId>simple-adk-agent</artifactId>
-    <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
     <packaging>jar</packaging>
 
     <name>Simple ADK Agent Example</name>
diff --git a/maven_plugin/pom.xml b/maven_plugin/pom.xml
index 5adef5e38..3cf9bd7bd 100644
--- a/maven_plugin/pom.xml
+++ b/maven_plugin/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <groupId>com.google.adk</groupId>
         <artifactId>google-adk-parent</artifactId>
-        <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/pom.xml b/pom.xml
index 9a01ee252..4a20a5106 100644
--- a/pom.xml
+++ b/pom.xml
@@ -17,7 +17,7 @@
 
   <groupId>com.google.adk</groupId>
   <artifactId>google-adk-parent</artifactId>
-  <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+  <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
   <packaging>pom</packaging>
 
   <name>Google Agent Development Kit Maven Parent POM</name>
diff --git a/tutorials/city-time-weather/pom.xml b/tutorials/city-time-weather/pom.xml
index d0da1b3c9..8bcbb5887 100644
--- a/tutorials/city-time-weather/pom.xml
+++ b/tutorials/city-time-weather/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-parent</artifactId>
-    <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/tutorials/live-audio-single-agent/pom.xml b/tutorials/live-audio-single-agent/pom.xml
index 2d54c6bdf..463565e7c 100644
--- a/tutorials/live-audio-single-agent/pom.xml
+++ b/tutorials/live-audio-single-agent/pom.xml
@@ -20,7 +20,7 @@
   <parent>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-parent</artifactId>
-    <version>1.1.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
     <relativePath>../../pom.xml</relativePath>
   </parent>