diff --git a/bin/utils/release/release_version_update.sh b/bin/utils/release/release_version_update.sh
index 1920a2339edb..151368ef357e 100755
--- a/bin/utils/release/release_version_update.sh
+++ b/bin/utils/release/release_version_update.sh
@@ -76,6 +76,7 @@ declare -a xml_files=(
     "${root}/modules/openapi-generator-gradle-plugin/pom.xml"
     "${root}/modules/openapi-generator-core/pom.xml"
     "${root}/modules/openapi-generator-maven-plugin/pom.xml"
+    "${root}/modules/openapi-generator-mill-plugin/pom.xml"
     "${root}/modules/openapi-generator-online/pom.xml"
     "${root}/modules/openapi-generator/pom.xml"
     "${root}/modules/openapi-generator-gradle-plugin/gradle.properties"
diff --git a/modules/openapi-generator-cli/pom.xml b/modules/openapi-generator-cli/pom.xml
index 0301b15b00f2..745e3e596588 100644
--- a/modules/openapi-generator-cli/pom.xml
+++ b/modules/openapi-generator-cli/pom.xml
@@ -4,7 +4,7 @@
         <groupId>org.openapitools</groupId>
         <artifactId>openapi-generator-project</artifactId>
         <!-- RELEASE_VERSION -->
-        <version>7.21.0-SNAPSHOT</version>
+        <version>7.21.0</version>
         <!-- /RELEASE_VERSION -->
         <relativePath>../../pom.xml</relativePath>
     </parent>
diff --git a/modules/openapi-generator-core/pom.xml b/modules/openapi-generator-core/pom.xml
index 836a6afd9acd..a114243fe9b6 100644
--- a/modules/openapi-generator-core/pom.xml
+++ b/modules/openapi-generator-core/pom.xml
@@ -6,7 +6,7 @@
     <artifactId>openapi-generator-project</artifactId>
     <groupId>org.openapitools</groupId>
     <!-- RELEASE_VERSION -->
-    <version>7.21.0-SNAPSHOT</version>
+    <version>7.21.0</version>
     <!-- /RELEASE_VERSION -->
     <relativePath>../../pom.xml</relativePath>
   </parent>
diff --git a/modules/openapi-generator-gradle-plugin/gradle.properties b/modules/openapi-generator-gradle-plugin/gradle.properties
index 19a2106438d8..cc3df637abc9 100644
--- a/modules/openapi-generator-gradle-plugin/gradle.properties
+++ b/modules/openapi-generator-gradle-plugin/gradle.properties
@@ -1,5 +1,5 @@
 # RELEASE_VERSION
-openApiGeneratorVersion=7.21.0-SNAPSHOT
+openApiGeneratorVersion=7.21.0
 # /RELEASE_VERSION
 
 # BEGIN placeholders
diff --git a/modules/openapi-generator-gradle-plugin/pom.xml b/modules/openapi-generator-gradle-plugin/pom.xml
index 22765b6e5f98..15d69bb20cc0 100644
--- a/modules/openapi-generator-gradle-plugin/pom.xml
+++ b/modules/openapi-generator-gradle-plugin/pom.xml
@@ -4,7 +4,7 @@
         <groupId>org.openapitools</groupId>
         <artifactId>openapi-generator-project</artifactId>
         <!-- RELEASE_VERSION -->
-        <version>7.21.0-SNAPSHOT</version>
+        <version>7.21.0</version>
         <!-- /RELEASE_VERSION -->
         <relativePath>../../pom.xml</relativePath>
     </parent>
diff --git a/modules/openapi-generator-gradle-plugin/samples/local-spec/gradle.properties b/modules/openapi-generator-gradle-plugin/samples/local-spec/gradle.properties
index a5b7e0f3be1f..6168e12f29c7 100644
--- a/modules/openapi-generator-gradle-plugin/samples/local-spec/gradle.properties
+++ b/modules/openapi-generator-gradle-plugin/samples/local-spec/gradle.properties
@@ -1,3 +1,3 @@
 # RELEASE_VERSION
-openApiGeneratorVersion=7.21.0-SNAPSHOT
+openApiGeneratorVersion=7.21.0
 # /RELEASE_VERSION
diff --git a/modules/openapi-generator-maven-plugin/examples/java-client.xml b/modules/openapi-generator-maven-plugin/examples/java-client.xml
index 3b5cb6e15157..cbd053ac8acf 100644
--- a/modules/openapi-generator-maven-plugin/examples/java-client.xml
+++ b/modules/openapi-generator-maven-plugin/examples/java-client.xml
@@ -13,7 +13,7 @@
                 <groupId>org.openapitools</groupId>
                 <artifactId>openapi-generator-maven-plugin</artifactId>
                 <!-- RELEASE_VERSION -->
-                <version>7.21.0-SNAPSHOT</version>
+                <version>7.21.0</version>
                 <!-- /RELEASE_VERSION -->
                 <executions>
                     <execution>
diff --git a/modules/openapi-generator-maven-plugin/examples/kotlin.xml b/modules/openapi-generator-maven-plugin/examples/kotlin.xml
index 73132470b69c..5efcca9a9b86 100644
--- a/modules/openapi-generator-maven-plugin/examples/kotlin.xml
+++ b/modules/openapi-generator-maven-plugin/examples/kotlin.xml
@@ -15,7 +15,7 @@
 				<groupId>org.openapitools</groupId>
 				<artifactId>openapi-generator-maven-plugin</artifactId>
 				<!-- RELEASE_VERSION -->
-				<version>7.21.0-SNAPSHOT</version>
+				<version>7.21.0</version>
 				<!-- /RELEASE_VERSION -->
 				<executions>
 					<execution>
diff --git a/modules/openapi-generator-maven-plugin/examples/multi-module/java-client/pom.xml b/modules/openapi-generator-maven-plugin/examples/multi-module/java-client/pom.xml
index f2ba122b9a70..ccdc76a643db 100644
--- a/modules/openapi-generator-maven-plugin/examples/multi-module/java-client/pom.xml
+++ b/modules/openapi-generator-maven-plugin/examples/multi-module/java-client/pom.xml
@@ -19,7 +19,7 @@
                 <groupId>org.openapitools</groupId>
                 <artifactId>openapi-generator-maven-plugin</artifactId>
                 <!-- RELEASE_VERSION -->
-                <version>7.21.0-SNAPSHOT</version>
+                <version>7.21.0</version>
                 <!-- /RELEASE_VERSION -->
                 <dependencies>
                     <dependency>
diff --git a/modules/openapi-generator-maven-plugin/examples/non-java-invalid-spec.xml b/modules/openapi-generator-maven-plugin/examples/non-java-invalid-spec.xml
index 10024aa410f5..e26f63b4b1cc 100644
--- a/modules/openapi-generator-maven-plugin/examples/non-java-invalid-spec.xml
+++ b/modules/openapi-generator-maven-plugin/examples/non-java-invalid-spec.xml
@@ -13,7 +13,7 @@
                 <groupId>org.openapitools</groupId>
                 <artifactId>openapi-generator-maven-plugin</artifactId>
                 <!-- RELEASE_VERSION -->
-                <version>7.21.0-SNAPSHOT</version>
+                <version>7.21.0</version>
                 <!-- /RELEASE_VERSION -->
                 <executions>
                     <execution>
diff --git a/modules/openapi-generator-maven-plugin/examples/non-java.xml b/modules/openapi-generator-maven-plugin/examples/non-java.xml
index 7fc3a00b5695..4aa52c4b3545 100644
--- a/modules/openapi-generator-maven-plugin/examples/non-java.xml
+++ b/modules/openapi-generator-maven-plugin/examples/non-java.xml
@@ -13,7 +13,7 @@
                 <groupId>org.openapitools</groupId>
                 <artifactId>openapi-generator-maven-plugin</artifactId>
                 <!-- RELEASE_VERSION -->
-                <version>7.21.0-SNAPSHOT</version>
+                <version>7.21.0</version>
                 <!-- /RELEASE_VERSION -->
                 <executions>
                     <execution>
diff --git a/modules/openapi-generator-maven-plugin/examples/spring.xml b/modules/openapi-generator-maven-plugin/examples/spring.xml
index e089282a29d2..34b319f4a767 100644
--- a/modules/openapi-generator-maven-plugin/examples/spring.xml
+++ b/modules/openapi-generator-maven-plugin/examples/spring.xml
@@ -20,7 +20,7 @@
                 <groupId>org.openapitools</groupId>
                 <artifactId>openapi-generator-maven-plugin</artifactId>
                 <!-- RELEASE_VERSION -->
-                <version>7.21.0-SNAPSHOT</version>
+                <version>7.21.0</version>
                 <!-- /RELEASE_VERSION -->
                 <executions>
                     <execution>
diff --git a/modules/openapi-generator-maven-plugin/pom.xml b/modules/openapi-generator-maven-plugin/pom.xml
index 02d1a053996e..01ebf50d9c88 100644
--- a/modules/openapi-generator-maven-plugin/pom.xml
+++ b/modules/openapi-generator-maven-plugin/pom.xml
@@ -5,7 +5,7 @@
         <groupId>org.openapitools</groupId>
         <artifactId>openapi-generator-project</artifactId>
         <!-- RELEASE_VERSION -->
-        <version>7.21.0-SNAPSHOT</version>
+        <version>7.21.0</version>
         <!-- /RELEASE_VERSION -->
         <relativePath>../../pom.xml</relativePath>
     </parent>
diff --git a/modules/openapi-generator-mill-plugin/example/mill-build/version.properties b/modules/openapi-generator-mill-plugin/example/mill-build/version.properties
index a5b7e0f3be1f..6168e12f29c7 100644
--- a/modules/openapi-generator-mill-plugin/example/mill-build/version.properties
+++ b/modules/openapi-generator-mill-plugin/example/mill-build/version.properties
@@ -1,3 +1,3 @@
 # RELEASE_VERSION
-openApiGeneratorVersion=7.21.0-SNAPSHOT
+openApiGeneratorVersion=7.21.0
 # /RELEASE_VERSION
diff --git a/modules/openapi-generator-mill-plugin/pom.xml b/modules/openapi-generator-mill-plugin/pom.xml
index e02f4f1eda1f..9d9008d6a6df 100644
--- a/modules/openapi-generator-mill-plugin/pom.xml
+++ b/modules/openapi-generator-mill-plugin/pom.xml
@@ -4,7 +4,7 @@
         <groupId>org.openapitools</groupId>
         <artifactId>openapi-generator-project</artifactId>
         <!-- RELEASE_VERSION -->
-        <version>7.21.0-SNAPSHOT</version>
+        <version>7.21.0</version>
         <!-- /RELEASE_VERSION -->
         <relativePath>../../pom.xml</relativePath>
     </parent>
diff --git a/modules/openapi-generator-online/pom.xml b/modules/openapi-generator-online/pom.xml
index c21b376263dd..1b2ab765c76c 100644
--- a/modules/openapi-generator-online/pom.xml
+++ b/modules/openapi-generator-online/pom.xml
@@ -4,7 +4,7 @@
         <groupId>org.openapitools</groupId>
         <artifactId>openapi-generator-project</artifactId>
         <!-- RELEASE_VERSION -->
-        <version>7.21.0-SNAPSHOT</version>
+        <version>7.21.0</version>
         <!-- /RELEASE_VERSION -->
         <relativePath>../../pom.xml</relativePath>
     </parent>
diff --git a/modules/openapi-generator/pom.xml b/modules/openapi-generator/pom.xml
index 6edc9a74a4e3..8777170c296d 100644
--- a/modules/openapi-generator/pom.xml
+++ b/modules/openapi-generator/pom.xml
@@ -4,7 +4,7 @@
         <groupId>org.openapitools</groupId>
         <artifactId>openapi-generator-project</artifactId>
         <!-- RELEASE_VERSION -->
-        <version>7.21.0-SNAPSHOT</version>
+        <version>7.21.0</version>
         <!-- /RELEASE_VERSION -->
         <relativePath>../../pom.xml</relativePath>
     </parent>
diff --git a/pom.xml b/pom.xml
index 5288c9db2345..183cd8d087a3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -15,7 +15,7 @@
     <packaging>pom</packaging>
     <name>openapi-generator-project</name>
     <!-- RELEASE_VERSION -->
-    <version>7.21.0-SNAPSHOT</version>
+    <version>7.21.0</version>
     <!-- /RELEASE_VERSION -->
     <url>https://github.com/openapitools/openapi-generator</url>
     <scm>