diff --git a/CHANGELOG.md b/CHANGELOG.md
index e04aacef9..7a8284a3e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,18 +1,31 @@
 ## LSP4J Change Log
 
-### v0.21.0 (TBD)
+### v0.22.0 (TBD)
+
+Fixed issues: <https://github.com/eclipse-lsp4j/lsp4j/milestone/29?closed=1>
+
+Breaking API changes:
+
+Nightly japicmp report: <https://download.eclipse.org/lsp4j/builds/main/japicmp-report/>
+
+### [v0.21.0 (May 2023)](https://github.com/eclipse-lsp4j/lsp4j/releases/tag/v0.21.0)
 
  * Implemented DAP version 1.60.0
+ * LSP4J's implementation of JSON-RPC 2.0 specification has been fixed regarding
+   de-structure the outermost array wrapper if it's a single array parameter.
+   * See [#553](https://github.com/eclipse-lsp4j/lsp4j/issues/553) for detailed discussion.
+ * xbase's `@Pure` and `ToStringBuilder` is no longer used by LSP4J
+   * See [#494](https://github.com/eclipse-lsp4j/lsp4j/issues/494) for detailed discussion.
 
 Fixed issues: <https://github.com/eclipse-lsp4j/lsp4j/milestone/28?closed=1>
 
 Breaking API changes:
 
  * LSP4J now requires Java 11 to build and run. This can be observed in the japicmp
-   report which says class file format version changed from  52.0 to 55.0.
+   report which says class file format version changed from 52.0 to 55.0.
    <https://github.com/eclipse-lsp4j/lsp4j/issues/547>.
 
-Nightly japicmp report: <https://download.eclipse.org/lsp4j/builds/main/japicmp-report/>
+japicmp report: <https://download.eclipse.org/lsp4j/updates/releases/0.21.0/japicmp-report/>
 
 ### [v0.20.1 (February 2023)](https://github.com/eclipse-lsp4j/lsp4j/releases/tag/v0.20.1)
 
diff --git a/README.md b/README.md
index 5d9a39668..8e2d0bf5f 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,8 @@ The Maven Repositories, p2 Update Sites, and the Snapshots contain _signed jars_
 
 ### Supported LSP Versions
 
- * LSP4J 0.21.&ast; _(Next release)_ &rarr; LSP 3.17.0
+ * LSP4J 0.22.&ast; _(Next release)_ &rarr; LSP 3.17.0
+ * LSP4J 0.21.&ast; &rarr; LSP 3.17.0
  * LSP4J 0.20.&ast; &rarr; LSP 3.17.0
  * LSP4J 0.19.&ast; &rarr; LSP 3.17.0
  * LSP4J 0.18.&ast; &rarr; LSP 3.17.0
@@ -58,7 +59,8 @@ The Maven Repositories, p2 Update Sites, and the Snapshots contain _signed jars_
 
 ### Supported DAP Versions
 
- * LSP4J 0.21.&ast; _(Next release)_ &rarr; DAP 1.60.0
+ * LSP4J 0.22.&ast; _(Next release)_ &rarr; DAP 1.60.0
+ * LSP4J 0.21.&ast; &rarr; DAP 1.60.0
  * LSP4J 0.20.&ast; &rarr; DAP 1.58.0
  * LSP4J 0.19.&ast; &rarr; DAP 1.58.0
  * LSP4J 0.18.&ast; &rarr; DAP 1.58.0
diff --git a/gradle/versions.gradle b/gradle/versions.gradle
index 5cb72addd..ade5460e2 100644
--- a/gradle/versions.gradle
+++ b/gradle/versions.gradle
@@ -10,7 +10,7 @@
  * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
  ******************************************************************************/
 
-version = '0.21.0-SNAPSHOT'
+version = '0.21.0'
 
 ext.versions = [
 	'xtend_lib': '2.28.0',
diff --git a/releng/build.Jenkinsfile b/releng/build.Jenkinsfile
index 5fc529cd1..5d99fd55a 100644
--- a/releng/build.Jenkinsfile
+++ b/releng/build.Jenkinsfile
@@ -73,7 +73,7 @@ pipeline {
             // XXX: Can release vs snapshot be detected automatically so that
             // the following line does not have to be commented/uncommented
             // on each change to/from SNAPSHOT?
-            sh './releng/deploy-build.sh'
+            // sh './releng/deploy-build.sh'
           }
         }
       }
diff --git a/releng/pom.xml b/releng/pom.xml
index 0932995a7..4b7ab3bc4 100644
--- a/releng/pom.xml
+++ b/releng/pom.xml
@@ -29,29 +29,29 @@
 		<dependency>
 			<groupId>org.eclipse.lsp4j</groupId>
 			<artifactId>org.eclipse.lsp4j</artifactId>
-			<version>0.21.0-SNAPSHOT</version>
+			<version>0.21.0</version>
 		</dependency>
 		<dependency>
 			<groupId>org.eclipse.lsp4j</groupId>
 			<artifactId>org.eclipse.lsp4j</artifactId>
-			<version>0.21.0-SNAPSHOT</version>
+			<version>0.21.0</version>
 			<classifier>sources</classifier>
 		</dependency>
 		<dependency>
 			<groupId>org.eclipse.lsp4j</groupId>
 			<artifactId>org.eclipse.lsp4j.debug</artifactId>
-			<version>0.21.0-SNAPSHOT</version>
+			<version>0.21.0</version>
 		</dependency>
 		<dependency>
 			<groupId>org.eclipse.lsp4j</groupId>
 			<artifactId>org.eclipse.lsp4j.debug</artifactId>
-			<version>0.21.0-SNAPSHOT</version>
+			<version>0.21.0</version>
 			<classifier>sources</classifier>
 		</dependency>
 		<dependency>
 			<groupId>org.eclipse.lsp4j</groupId>
 			<artifactId>org.eclipse.lsp4j.generator</artifactId>
-			<version>0.21.0-SNAPSHOT</version>
+			<version>0.21.0</version>
 			<exclusions>
 				<exclusion>
 					<groupId>com.google</groupId>
@@ -62,51 +62,51 @@
 		<dependency>
 			<groupId>org.eclipse.lsp4j</groupId>
 			<artifactId>org.eclipse.lsp4j.generator</artifactId>
-			<version>0.21.0-SNAPSHOT</version>
+			<version>0.21.0</version>
 			<classifier>sources</classifier>
 		</dependency>
 		<dependency>
 			<groupId>org.eclipse.lsp4j</groupId>
 			<artifactId>org.eclipse.lsp4j.jsonrpc</artifactId>
-			<version>0.21.0-SNAPSHOT</version>
+			<version>0.21.0</version>
 		</dependency>
 		<dependency>
 			<groupId>org.eclipse.lsp4j</groupId>
 			<artifactId>org.eclipse.lsp4j.jsonrpc</artifactId>
-			<version>0.21.0-SNAPSHOT</version>
+			<version>0.21.0</version>
 			<classifier>sources</classifier>
 		</dependency>
 		<dependency>
 			<groupId>org.eclipse.lsp4j</groupId>
 			<artifactId>org.eclipse.lsp4j.jsonrpc.debug</artifactId>
-			<version>0.21.0-SNAPSHOT</version>
+			<version>0.21.0</version>
 		</dependency>
 		<dependency>
 			<groupId>org.eclipse.lsp4j</groupId>
 			<artifactId>org.eclipse.lsp4j.jsonrpc.debug</artifactId>
-			<version>0.21.0-SNAPSHOT</version>
+			<version>0.21.0</version>
 			<classifier>sources</classifier>
 		</dependency>
 		<dependency>
 			<groupId>org.eclipse.lsp4j</groupId>
 			<artifactId>org.eclipse.lsp4j.websocket.jakarta</artifactId>
-			<version>0.21.0-SNAPSHOT</version>
+			<version>0.21.0</version>
 		</dependency>
 		<dependency>
 			<groupId>org.eclipse.lsp4j</groupId>
 			<artifactId>org.eclipse.lsp4j.websocket.jakarta</artifactId>
-			<version>0.21.0-SNAPSHOT</version>
+			<version>0.21.0</version>
 			<classifier>sources</classifier>
 		</dependency>
 		<dependency>
 			<groupId>org.eclipse.lsp4j</groupId>
 			<artifactId>org.eclipse.lsp4j.websocket</artifactId>
-			<version>0.21.0-SNAPSHOT</version>
+			<version>0.21.0</version>
 		</dependency>
 		<dependency>
 			<groupId>org.eclipse.lsp4j</groupId>
 			<artifactId>org.eclipse.lsp4j.websocket</artifactId>
-			<version>0.21.0-SNAPSHOT</version>
+			<version>0.21.0</version>
 			<classifier>sources</classifier>
 		</dependency>
 	</dependencies>