diff --git a/asconfigc/pom.xml b/asconfigc/pom.xml
index 9040c5995..810c5f392 100644
--- a/asconfigc/pom.xml
+++ b/asconfigc/pom.xml
@@ -22,7 +22,7 @@ limitations under the License.
   <parent>
     <groupId>com.as3mxml.vscode</groupId>
     <artifactId>vscode-as3mxml</artifactId>
-    <version>1.21.0-SNAPSHOT</version>
+    <version>1.21.0</version>
   </parent>
 
   <groupId>com.as3mxml.vscode</groupId>
diff --git a/check-java-version/pom.xml b/check-java-version/pom.xml
index a5ae300d8..c81bc4393 100644
--- a/check-java-version/pom.xml
+++ b/check-java-version/pom.xml
@@ -7,7 +7,7 @@
   <parent>
     <groupId>com.as3mxml.vscode</groupId>
     <artifactId>vscode-as3mxml</artifactId>
-    <version>1.21.0-SNAPSHOT</version>
+    <version>1.21.0</version>
   </parent>
 
   <groupId>com.as3mxml.vscode</groupId>
diff --git a/check-royale-version/pom.xml b/check-royale-version/pom.xml
index ad09d7b72..0904ae294 100644
--- a/check-royale-version/pom.xml
+++ b/check-royale-version/pom.xml
@@ -22,7 +22,7 @@ limitations under the License.
   <parent>
     <groupId>com.as3mxml.vscode</groupId>
     <artifactId>vscode-as3mxml</artifactId>
-    <version>1.21.0-SNAPSHOT</version>
+    <version>1.21.0</version>
   </parent>
 
   <groupId>com.as3mxml.vscode</groupId>
diff --git a/distribution/pom.xml b/distribution/pom.xml
index 47e271fde..a6e844f9f 100644
--- a/distribution/pom.xml
+++ b/distribution/pom.xml
@@ -22,7 +22,7 @@ limitations under the License.
   <parent>
     <groupId>com.as3mxml.vscode</groupId>
     <artifactId>vscode-as3mxml</artifactId>
-    <version>1.21.0-SNAPSHOT</version>
+    <version>1.21.0</version>
   </parent>
 
   <groupId>com.as3mxml.vscode</groupId>
diff --git a/distribution/src/assembly/CHANGELOG.md b/distribution/src/assembly/CHANGELOG.md
index ae0f70044..87173c264 100644
--- a/distribution/src/assembly/CHANGELOG.md
+++ b/distribution/src/assembly/CHANGELOG.md
@@ -1,5 +1,20 @@
 # ActionScript & MXML for Visual Studio Code Changelog
 
+## 1.21.0
+
+### Fixed Issues
+
+- Completion: Fixed ActionScript completion being triggered inside `<fx:Style>` element in MXML.
+- General: Fixed null exception in real-time problems checker.
+- Hover: Fixed detection and formatting of `@param` asdoc tags that contain tab characters instead of spaces.
+- Outline: Fixed document symbols not being rendered because range and selection range were not properly bounded.
+- Create Projcet: Fixed invalid Adobe AIR application ID generatd from class and package containing underscore (`_`) or other unsupported characters.
+
+### Other Changes
+
+- General: Dropped support for old versions of Apache FlexJS. Apache Royale remains supported, of course.
+- Views: Improved visibility behavior for AS3 Source Paths view, SDK status bar item, and Royale Target status bar item. In workspaces that contain valid projects with _asconfig.json_ files, these views are always visible after the language server starts successfully. In other workspaces, these views are visible only when a file of type _.as_, _.mxml_, or _asconfig.json_ is open in a visible editor.
+
 ## 1.20.1
 
 ### Fixed Issues
diff --git a/language-server/pom.xml b/language-server/pom.xml
index 489370b01..f23e7b5aa 100644
--- a/language-server/pom.xml
+++ b/language-server/pom.xml
@@ -22,7 +22,7 @@ limitations under the License.
   <parent>
     <groupId>com.as3mxml.vscode</groupId>
     <artifactId>vscode-as3mxml</artifactId>
-    <version>1.21.0-SNAPSHOT</version>
+    <version>1.21.0</version>
   </parent>
 
   <groupId>com.as3mxml.vscode</groupId>
diff --git a/pom.xml b/pom.xml
index 999820cac..20d82e838 100644
--- a/pom.xml
+++ b/pom.xml
@@ -20,7 +20,7 @@ limitations under the License.
 
   <groupId>com.as3mxml.vscode</groupId>
   <artifactId>vscode-as3mxml</artifactId>
-  <version>1.21.0-SNAPSHOT</version>
+  <version>1.21.0</version>
   <name>vscode-as3mxml</name>
   <packaging>pom</packaging>
 
diff --git a/rcsh/pom.xml b/rcsh/pom.xml
index a936b3cb3..5c376b24b 100644
--- a/rcsh/pom.xml
+++ b/rcsh/pom.xml
@@ -22,7 +22,7 @@ limitations under the License.
   <parent>
     <groupId>com.as3mxml.vscode</groupId>
     <artifactId>vscode-as3mxml</artifactId>
-    <version>1.21.0-SNAPSHOT</version>
+    <version>1.21.0</version>
   </parent>
 
   <groupId>com.as3mxml.vscode</groupId>
diff --git a/vscode-extension/package-lock.json b/vscode-extension/package-lock.json
index 7dadddde0..9fc6acf09 100644
--- a/vscode-extension/package-lock.json
+++ b/vscode-extension/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "vscode-as3mxml",
-  "version": "1.21.0-SNAPSHOT",
+  "version": "1.21.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "vscode-as3mxml",
-      "version": "1.21.0-SNAPSHOT",
+      "version": "1.21.0",
       "license": "Apache-2.0",
       "devDependencies": {
         "@rgrove/parse-xml": "^4.0.1",
diff --git a/vscode-extension/package.json b/vscode-extension/package.json
index d7130caea..9a83cc726 100644
--- a/vscode-extension/package.json
+++ b/vscode-extension/package.json
@@ -2,7 +2,7 @@
   "name": "vscode-as3mxml",
   "displayName": "ActionScript & MXML",
   "description": "Language support for ActionScript and MXML",
-  "version": "1.21.0-SNAPSHOT",
+  "version": "1.21.0",
   "publisher": "bowlerhatllc",
   "homepage": "https://as3mxml.com/",
   "repository": {
diff --git a/vscode-extension/pom.xml b/vscode-extension/pom.xml
index a07fc199e..9528a7aaf 100644
--- a/vscode-extension/pom.xml
+++ b/vscode-extension/pom.xml
@@ -22,7 +22,7 @@ limitations under the License.
   <parent>
     <groupId>com.as3mxml.vscode</groupId>
     <artifactId>vscode-as3mxml</artifactId>
-    <version>1.21.0-SNAPSHOT</version>
+    <version>1.21.0</version>
   </parent>
 
   <groupId>com.as3mxml.vscode</groupId>