diff --git a/ChangeLog b/ChangeLog
index 041fd7c4e..057a1c678 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,45 @@
+2020-08-04 [version 1.12.1]
+	* [FEATURE] asyncDeleteBulk
+	* [FEATURE] add maven plugin of checkstyle
+	* [FEATURE] apply checkstyle
+	* [CLEANUP] apply Indentation checkstyle
+	* [CLEANUP] apply LineLength checkstyle
+	* [CLEANUP] reduce line length in test sources
+	* [CLEANUP] reduce line length in client sources
+	* [CLEANUP] apply Import checkstyle
+	* [CLEANUP] replace tab charcter to space
+	* [CLEANUP] remove nested block
+	* [CLEANUP] prevent instantiation of utility classes
+	* [CLEANUP] remove duplicate code for parsing response of
+	            BTreeGetBulkOperation
+	* [CLEANUP] merged CollectionUpsertOperation to CollectionStoreOperation
+	* [CLEANUP] solve hash point collision with comparison socket address of
+	            node
+	* [CLEANUP] renamed store to insert of collection
+	* [CLEANUP] update comment for collection response format
+	* [CLEANUP] change some javadoc comments to use code tag
+	* [CLEANUP] don't occur switchover in sop exist operation.
+	* [CLEANUP] remove non-javadoc comments
+	* [CLEANUP] refactor asyncSetBulk, asyncDeleteBulk
+	* [CLEANUP] deprecate bulkService API
+	* [CLEANUP] refactored the constructor functions of KetamaNodeLocator.
+	* [CLEANUP] refactor the parts that use socketChannel API
+	* [CLEANUP] remove the authentication failure log when OperationException
+	            occurs
+	* [CLEANUP] refactored the handleNodeManageQueue() method
+	* [CLEANUP] refactored the attemptReconnects() method
+	* [CLEANUP] refactored the ENABLE_REPLICATION code tag
+	* [CLEANUP] refactered the updateConnections() method
+	* [CLEANUP] separated the updateReplConnections() from the
+	            updateConnections()
+	* [CLEANUP] moved the selector wakeup code into putMemcachedQueue()
+	* [FIX] Canceling the operations if input queue of node is full when moving
+	        operations
+	* [ENHANCE] destroy read queue of removed node
+	* [ENHANCE] do not cancel the operation twice when using authentication in
+	            setupResend of TCPMemcachedNodeImpl
+	* [TEST] refactor test codes related setUp and tearDown
+
 2020-03-16 [version 1.12.0]
 	* [FEATURE] change max element bytes
 	* [FIX] ConcurrentModificationException in foreach loop of
diff --git a/README.md b/README.md
index 281b764ba..796265029 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ To use it, add the following dependency to your pom.xml.
 	<dependency>
 		<groupId>com.navercorp.arcus</groupId>
 		<artifactId>arcus-java-client</artifactId>
-		<version>1.12.0</version>
+		<version>1.12.1</version>
 	</dependency>
 </dependencies>
 ```
diff --git a/docs/arcus-java-client-getting-started.md b/docs/arcus-java-client-getting-started.md
index 135192d79..d3ad07964 100644
--- a/docs/arcus-java-client-getting-started.md
+++ b/docs/arcus-java-client-getting-started.md
@@ -75,7 +75,7 @@ $ mvn eclipse:eclipse // 이클립스 IDE를 사용하는 경우 실행하여 
         <dependency>
             <groupId>com.navercorp.arcus</groupId>
             <artifactId>arcus-java-client</artifactId>
-            <version>1.12.0</version>
+            <version>1.12.1</version>
         </dependency>
         
         <!-- 로거 의존성을 추가합니다. -->
diff --git a/pom.xml b/pom.xml
index 0abbafe99..e0a9a1158 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.navercorp.arcus</groupId>
     <artifactId>arcus-java-client</artifactId>
-    <version>1.12.0</version>
+    <version>1.12.1</version>
     <name>Arcus Java Client</name>
     <description>Java client for Arcus memcached</description>
     <packaging>jar</packaging>