diff --git a/a2a/pom.xml b/a2a/pom.xml
index c05ca3009..6d94243f8 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>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
   </parent>
 
   <artifactId>google-adk-a2a</artifactId>
diff --git a/a2a/webservice/pom.xml b/a2a/webservice/pom.xml
index 204b0fafa..43ec6d018 100644
--- a/a2a/webservice/pom.xml
+++ b/a2a/webservice/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-parent</artifactId>
-    <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
     <relativePath>../../pom.xml</relativePath>
   </parent>
 
diff --git a/contrib/firestore-session-service/pom.xml b/contrib/firestore-session-service/pom.xml
index 592555a0f..4b14fe9c7 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>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.2.1-SNAPSHOT</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 e5ec78842..e9995a06b 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>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.2.1-SNAPSHOT</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 e12ca09a1..1e7af90ae 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>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
     <relativePath>..</relativePath>
   </parent>
 
diff --git a/contrib/samples/a2a_remote/pom.xml b/contrib/samples/a2a_remote/pom.xml
index e82f8b2b2..99e7c9829 100644
--- a/contrib/samples/a2a_remote/pom.xml
+++ b/contrib/samples/a2a_remote/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <groupId>com.google.adk</groupId>
     <artifactId>google-adk-parent</artifactId>
-    <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
     <relativePath>../../../pom.xml</relativePath>
   </parent>
 
diff --git a/contrib/samples/configagent/pom.xml b/contrib/samples/configagent/pom.xml
index db7bde0c5..097323363 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>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.2.1-SNAPSHOT</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 d7d273b0b..64ef813bc 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>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.2.1-SNAPSHOT</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 656258ebf..7f59e3954 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>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.2.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>../../..</relativePath>
     </parent>
 
diff --git a/contrib/samples/pom.xml b/contrib/samples/pom.xml
index 043e6a104..9e90b7e27 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>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
     <relativePath>../..</relativePath>
   </parent>
 
diff --git a/contrib/sarvam-ai/pom.xml b/contrib/sarvam-ai/pom.xml
index 12eb49ac0..abb94167d 100644
--- a/contrib/sarvam-ai/pom.xml
+++ b/contrib/sarvam-ai/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <groupId>com.google.adk</groupId>
         <artifactId>google-adk-parent</artifactId>
-        <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.2.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>../../pom.xml</relativePath>
     </parent>
 
diff --git a/contrib/spring-ai/pom.xml b/contrib/spring-ai/pom.xml
index 01cf66b01..b663b06d5 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>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.2.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>../../pom.xml</relativePath>
     </parent>
 
diff --git a/core/pom.xml b/core/pom.xml
index 06330da65..b6d829cd6 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>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
   </parent>
 
   <artifactId>google-adk</artifactId>
diff --git a/dev/pom.xml b/dev/pom.xml
index 1d2e2f0c7..93817b7e4 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>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.1-SNAPSHOT</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 910e74439..38bc9b561 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>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.1-SNAPSHOT</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 17256f364..c713f525d 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>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.1-SNAPSHOT</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 3cf9bd7bd..f87df835d 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>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+        <version>1.2.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/pom.xml b/pom.xml
index 16ae4ad19..2d8ff1daf 100644
--- a/pom.xml
+++ b/pom.xml
@@ -17,7 +17,7 @@
 
   <groupId>com.google.adk</groupId>
   <artifactId>google-adk-parent</artifactId>
-  <version>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+  <version>1.2.1-SNAPSHOT</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 b1acf7c56..d0298b1e6 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>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.1-SNAPSHOT</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 463565e7c..3c4475b6a 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>1.2.0</version><!-- {x-version-update:google-adk:current} -->
+    <version>1.2.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
     <relativePath>../../pom.xml</relativePath>
   </parent>