diff --git a/History.md b/History.md
index 463d09b..1366aae 100644
--- a/History.md
+++ b/History.md
@@ -1,4 +1,13 @@
 
+2.1.2 / 2025-02-18
+==================
+
+### Bug Fixes
+
+- make acks thread safe ([4f45e3c](https://github.com/socketio/socket.io-client-java/commit/4f45e3c1271554da5b3457f447a6d6b060ef5ffd))
+
+
+
 2.1.1 / 2024-07-10
 ==================
 
diff --git a/pom.xml b/pom.xml
index 2e7a802..70ca5e4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -2,7 +2,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>io.socket</groupId>
   <artifactId>socket.io-client</artifactId>
-  <version>2.1.2-SNAPSHOT</version>
+  <version>2.1.2</version>
   <packaging>jar</packaging>
   <name>socket.io-client</name>
   <description>Socket.IO Client Library for Java</description>
@@ -30,7 +30,7 @@
     <url>https://github.com/socketio/socket.io-client-java</url>
     <connection>scm:git:https://github.com/socketio/socket.io-client-java.git</connection>
     <developerConnection>scm:git:https://github.com/socketio/socket.io-client-java.git</developerConnection>
-    <tag>HEAD</tag>
+    <tag>socket.io-client-2.1.2</tag>
   </scm>
 
   <developers>
diff --git a/src/site/markdown/changelog.md b/src/site/markdown/changelog.md
index 1939253..e671c86 100644
--- a/src/site/markdown/changelog.md
+++ b/src/site/markdown/changelog.md
@@ -2,6 +2,7 @@
 
 | Version                                                                                                      | Release date  |
 |--------------------------------------------------------------------------------------------------------------|---------------|
+| [2.1.2](#211-2025-02-18)                                                                                     | February 2025 |
 | [2.1.1](#211-2024-07-10)                                                                                     | July 2024     |
 | [1.0.2](#102-2022-07-11) (from the [1.x](https://github.com/socketio/socket.io-client-java/tree/1.x) branch) | July 2022     |
 | [2.1.0](#210-2022-07-10)                                                                                     | July 2022     |
@@ -12,6 +13,15 @@
 
 # Release notes
 
+## [2.1.2](https://github.com/socketio/socket.io-client-java/compare/socket.io-client-2.1.1...socket.io-client-2.1.2) (2025-02-18)
+
+
+### Bug Fixes
+
+* make acks thread safe ([4f45e3c](https://github.com/socketio/socket.io-client-java/commit/4f45e3c1271554da5b3457f447a6d6b060ef5ffd))
+
+
+
 ## [2.1.1](https://github.com/socketio/socket.io-client-java/compare/socket.io-client-2.1.0...socket.io-client-2.1.1) (2024-07-10)