diff --git a/commonmark-ext-autolink/pom.xml b/commonmark-ext-autolink/pom.xml
index c95d7138..3558b223 100644
--- a/commonmark-ext-autolink/pom.xml
+++ b/commonmark-ext-autolink/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.21.0-SNAPSHOT</version>
+        <version>0.21.0</version>
     </parent>
 
     <artifactId>commonmark-ext-autolink</artifactId>
diff --git a/commonmark-ext-gfm-strikethrough/pom.xml b/commonmark-ext-gfm-strikethrough/pom.xml
index 41e358b0..a1eb8f46 100644
--- a/commonmark-ext-gfm-strikethrough/pom.xml
+++ b/commonmark-ext-gfm-strikethrough/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.21.0-SNAPSHOT</version>
+        <version>0.21.0</version>
     </parent>
 
     <artifactId>commonmark-ext-gfm-strikethrough</artifactId>
diff --git a/commonmark-ext-gfm-tables/pom.xml b/commonmark-ext-gfm-tables/pom.xml
index 940e491e..adbc14e9 100644
--- a/commonmark-ext-gfm-tables/pom.xml
+++ b/commonmark-ext-gfm-tables/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.21.0-SNAPSHOT</version>
+        <version>0.21.0</version>
     </parent>
 
     <artifactId>commonmark-ext-gfm-tables</artifactId>
diff --git a/commonmark-ext-heading-anchor/pom.xml b/commonmark-ext-heading-anchor/pom.xml
index 40c8c91a..33dfa985 100644
--- a/commonmark-ext-heading-anchor/pom.xml
+++ b/commonmark-ext-heading-anchor/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.21.0-SNAPSHOT</version>
+        <version>0.21.0</version>
     </parent>
 
     <artifactId>commonmark-ext-heading-anchor</artifactId>
diff --git a/commonmark-ext-image-attributes/pom.xml b/commonmark-ext-image-attributes/pom.xml
index 58ff6af4..307597da 100644
--- a/commonmark-ext-image-attributes/pom.xml
+++ b/commonmark-ext-image-attributes/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.21.0-SNAPSHOT</version>
+        <version>0.21.0</version>
     </parent>
 
     <artifactId>commonmark-ext-image-attributes</artifactId>
diff --git a/commonmark-ext-ins/pom.xml b/commonmark-ext-ins/pom.xml
index 47539861..f9e095ea 100644
--- a/commonmark-ext-ins/pom.xml
+++ b/commonmark-ext-ins/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.21.0-SNAPSHOT</version>
+        <version>0.21.0</version>
     </parent>
 
     <artifactId>commonmark-ext-ins</artifactId>
diff --git a/commonmark-ext-task-list-items/pom.xml b/commonmark-ext-task-list-items/pom.xml
index c56b00db..772088d4 100644
--- a/commonmark-ext-task-list-items/pom.xml
+++ b/commonmark-ext-task-list-items/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.21.0-SNAPSHOT</version>
+        <version>0.21.0</version>
     </parent>
 
     <artifactId>commonmark-ext-task-list-items</artifactId>
diff --git a/commonmark-ext-yaml-front-matter/pom.xml b/commonmark-ext-yaml-front-matter/pom.xml
index 57aa1fbd..9fd018c9 100644
--- a/commonmark-ext-yaml-front-matter/pom.xml
+++ b/commonmark-ext-yaml-front-matter/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <artifactId>commonmark-parent</artifactId>
         <groupId>org.commonmark</groupId>
-        <version>0.21.0-SNAPSHOT</version>
+        <version>0.21.0</version>
     </parent>
 
     <artifactId>commonmark-ext-yaml-front-matter</artifactId>
diff --git a/commonmark-integration-test/pom.xml b/commonmark-integration-test/pom.xml
index 0745fe2d..2646e745 100644
--- a/commonmark-integration-test/pom.xml
+++ b/commonmark-integration-test/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.21.0-SNAPSHOT</version>
+        <version>0.21.0</version>
     </parent>
 
     <artifactId>commonmark-integration-test</artifactId>
diff --git a/commonmark-test-util/pom.xml b/commonmark-test-util/pom.xml
index a9700153..6c43eb2a 100644
--- a/commonmark-test-util/pom.xml
+++ b/commonmark-test-util/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.21.0-SNAPSHOT</version>
+        <version>0.21.0</version>
     </parent>
 
     <artifactId>commonmark-test-util</artifactId>
diff --git a/commonmark/pom.xml b/commonmark/pom.xml
index a4b3368e..5b69ddcf 100644
--- a/commonmark/pom.xml
+++ b/commonmark/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.commonmark</groupId>
         <artifactId>commonmark-parent</artifactId>
-        <version>0.21.0-SNAPSHOT</version>
+        <version>0.21.0</version>
     </parent>
 
     <artifactId>commonmark</artifactId>
diff --git a/pom.xml b/pom.xml
index 1b8c1e82..f4408281 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
 
     <groupId>org.commonmark</groupId>
     <artifactId>commonmark-parent</artifactId>
-    <version>0.21.0-SNAPSHOT</version>
+    <version>0.21.0</version>
     <name>commonmark-java parent</name>
     <description>
         Java implementation of CommonMark, a specification of the Markdown format for turning plain text into formatted
@@ -112,52 +112,52 @@
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark</artifactId>
-                <version>0.21.0-SNAPSHOT</version>
+                <version>0.21.0</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-ext-autolink</artifactId>
-                <version>0.21.0-SNAPSHOT</version>
+                <version>0.21.0</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-ext-image-attributes</artifactId>
-                <version>0.21.0-SNAPSHOT</version>
+                <version>0.21.0</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-ext-ins</artifactId>
-                <version>0.21.0-SNAPSHOT</version>
+                <version>0.21.0</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-ext-gfm-strikethrough</artifactId>
-                <version>0.21.0-SNAPSHOT</version>
+                <version>0.21.0</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-ext-gfm-tables</artifactId>
-                <version>0.21.0-SNAPSHOT</version>
+                <version>0.21.0</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-ext-heading-anchor</artifactId>
-                <version>0.21.0-SNAPSHOT</version>
+                <version>0.21.0</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-ext-task-list-items</artifactId>
-                <version>0.21.0-SNAPSHOT</version>
+                <version>0.21.0</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-ext-yaml-front-matter</artifactId>
-                <version>0.21.0-SNAPSHOT</version>
+                <version>0.21.0</version>
             </dependency>
             <dependency>
                 <groupId>org.commonmark</groupId>
                 <artifactId>commonmark-test-util</artifactId>
-                <version>0.21.0-SNAPSHOT</version>
+                <version>0.21.0</version>
             </dependency>
 
             <!-- Common test dependencies -->
@@ -282,7 +282,7 @@
         <connection>scm:git:https://github.com/commonmark/commonmark-java</connection>
         <developerConnection>scm:git:https://github.com/commonmark/commonmark-java</developerConnection>
         <url>https://github.com/commonmark/commonmark-java</url>
-        <tag>HEAD</tag>
+        <tag>commonmark-parent-0.21.0</tag>
     </scm>
 
     <distributionManagement>