diff --git a/codegen/pom.xml b/codegen/pom.xml
index 4d232e3a92..25b1a2dfad 100644
--- a/codegen/pom.xml
+++ b/codegen/pom.xml
@@ -3,7 +3,7 @@
   <parent>
     <groupId>com.google.code.gson</groupId>
     <artifactId>gson-parent</artifactId>
-    <version>2.9.0-SNAPSHOT</version>
+    <version>2.9.0</version>
   </parent>
 
   <artifactId>gson-codegen</artifactId>
diff --git a/extras/pom.xml b/extras/pom.xml
index 0f83b14230..5c6fe72d09 100644
--- a/extras/pom.xml
+++ b/extras/pom.xml
@@ -3,7 +3,7 @@
   <parent>
     <groupId>com.google.code.gson</groupId>
     <artifactId>gson-parent</artifactId>
-    <version>2.9.0-SNAPSHOT</version>
+    <version>2.9.0</version>
   </parent>
 
   <artifactId>gson-extras</artifactId>
diff --git a/gson/pom.xml b/gson/pom.xml
index c1be6a920b..6535895372 100644
--- a/gson/pom.xml
+++ b/gson/pom.xml
@@ -1,12 +1,10 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
   <parent>
     <groupId>com.google.code.gson</groupId>
     <artifactId>gson-parent</artifactId>
-    <version>2.9.0-SNAPSHOT</version>
+    <version>2.9.0</version>
   </parent>
 
   <artifactId>gson</artifactId>
diff --git a/metrics/pom.xml b/metrics/pom.xml
index cf0afba330..537fcff671 100644
--- a/metrics/pom.xml
+++ b/metrics/pom.xml
@@ -1,11 +1,9 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <parent>
     <groupId>com.google.code.gson</groupId>
     <artifactId>gson-parent</artifactId>
-    <version>2.9.0-SNAPSHOT</version>
+    <version>2.9.0</version>
   </parent>
 
   <artifactId>gson-metrics</artifactId>
diff --git a/pom.xml b/pom.xml
index e542b7f002..cbd9bc003d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -11,7 +11,7 @@
 
   <groupId>com.google.code.gson</groupId>
   <artifactId>gson-parent</artifactId>
-  <version>2.9.0-SNAPSHOT</version>
+  <version>2.9.0</version>
   <packaging>pom</packaging>
 
   <name>Gson Parent</name>
@@ -35,7 +35,7 @@
     <url>https://github.com/google/gson/</url>
     <connection>scm:git:https://github.com/google/gson.git</connection>
     <developerConnection>scm:git:git@github.com:google/gson.git</developerConnection>
-    <tag>HEAD</tag>
+    <tag>gson-parent-2.9.0</tag>
   </scm>
 
   <issueManagement>
diff --git a/proto/pom.xml b/proto/pom.xml
index aa13c952a0..e7748f8d59 100644
--- a/proto/pom.xml
+++ b/proto/pom.xml
@@ -1,108 +1,107 @@
-<?xml version="1.0" encoding="UTF-8"?>
-
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-
-  <modelVersion>4.0.0</modelVersion>
-  <parent>
-    <groupId>com.google.code.gson</groupId>
-    <artifactId>gson-parent</artifactId>
-    <version>2.9.0-SNAPSHOT</version>
-  </parent>
-
-  <artifactId>proto</artifactId>
-  <name>Gson Protobuf Support</name>
-  <description>Gson support for Protobufs</description>
-
-  <licenses>
-    <license>
-      <name>Apache-2.0</name>
-      <url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
-    </license>
-  </licenses>
-
-  <dependencies>
-    <dependency>
-      <groupId>com.google.code.gson</groupId>
-      <artifactId>gson</artifactId>
-      <version>${project.parent.version}</version>
-    </dependency>
-
-    <dependency>
-      <groupId>com.google.protobuf</groupId>
-      <artifactId>protobuf-java</artifactId>
-      <version>4.0.0-rc-2</version>
-    </dependency>
-
-    <dependency>
-      <groupId>com.google.guava</groupId>
-      <artifactId>guava</artifactId>
-      <version>31.0.1-jre</version>
-    </dependency>
-
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <scope>test</scope>
-    </dependency>
-
-    <dependency>
-      <groupId>com.google.truth</groupId>
-      <artifactId>truth</artifactId>
-      <version>1.1.3</version>
-      <scope>test</scope>
-    </dependency>
-  </dependencies>
-
-  <build>
-    <finalName>gson-proto</finalName>
-    <!-- Setup based on https://quarkus.io/guides/grpc-getting-started#generating-java-files-from-proto-with-protobuf-maven-plugin -->
-    <extensions>
-      <extension>
-        <groupId>kr.motd.maven</groupId>
-        <artifactId>os-maven-plugin</artifactId>
-        <version>1.7.0</version>
-      </extension>
-    </extensions>
-
-    <plugins>
-      <plugin>
-        <groupId>org.xolstice.maven.plugins</groupId>
-        <artifactId>protobuf-maven-plugin</artifactId>
-        <version>0.6.1</version>
-        <configuration>
-          <protocArtifact>com.google.protobuf:protoc:3.17.3:exe:${os.detected.classifier}</protocArtifact>
-        </configuration>
-        <executions>
-          <execution>
-            <goals>
-              <goal>compile</goal>
-              <goal>test-compile</goal>
-            </goals>
-          </execution>
-        </executions>
-      </plugin>
-    </plugins>
-
-    <pluginManagement>
-      <plugins>
-        <plugin>
-          <groupId>org.apache.maven.plugins</groupId>
-          <artifactId>maven-deploy-plugin</artifactId>
-          <version>3.0.0-M2</version>
-          <configuration>
-            <!-- Not deployed -->
-            <skip>true</skip>
-          </configuration>
-        </plugin>
-      </plugins>
-    </pluginManagement>
-  </build>
-
-  <developers>
-    <developer>
-      <name>Inderjeet Singh</name>
-      <organization>Google Inc.</organization>
-    </developer>
-  </developers>
-</project>
+<?xml version="1.0" encoding="UTF-8"?>
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>com.google.code.gson</groupId>
+    <artifactId>gson-parent</artifactId>
+    <version>2.9.0</version>
+  </parent>
+
+  <artifactId>proto</artifactId>
+  <name>Gson Protobuf Support</name>
+  <description>Gson support for Protobufs</description>
+
+  <licenses>
+    <license>
+      <name>Apache-2.0</name>
+      <url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
+    </license>
+  </licenses>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.google.code.gson</groupId>
+      <artifactId>gson</artifactId>
+      <version>${project.parent.version}</version>
+    </dependency>
+
+    <dependency>
+      <groupId>com.google.protobuf</groupId>
+      <artifactId>protobuf-java</artifactId>
+      <version>4.0.0-rc-2</version>
+    </dependency>
+
+    <dependency>
+      <groupId>com.google.guava</groupId>
+      <artifactId>guava</artifactId>
+      <version>31.0.1-jre</version>
+    </dependency>
+
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <scope>test</scope>
+    </dependency>
+
+    <dependency>
+      <groupId>com.google.truth</groupId>
+      <artifactId>truth</artifactId>
+      <version>1.1.3</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <finalName>gson-proto</finalName>
+    <!-- Setup based on https://quarkus.io/guides/grpc-getting-started#generating-java-files-from-proto-with-protobuf-maven-plugin -->
+    <extensions>
+      <extension>
+        <groupId>kr.motd.maven</groupId>
+        <artifactId>os-maven-plugin</artifactId>
+        <version>1.7.0</version>
+      </extension>
+    </extensions>
+
+    <plugins>
+      <plugin>
+        <groupId>org.xolstice.maven.plugins</groupId>
+        <artifactId>protobuf-maven-plugin</artifactId>
+        <version>0.6.1</version>
+        <configuration>
+          <protocArtifact>com.google.protobuf:protoc:3.17.3:exe:${os.detected.classifier}</protocArtifact>
+        </configuration>
+        <executions>
+          <execution>
+            <goals>
+              <goal>compile</goal>
+              <goal>test-compile</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+
+    <pluginManagement>
+      <plugins>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-deploy-plugin</artifactId>
+          <version>3.0.0-M2</version>
+          <configuration>
+            <!-- Not deployed -->
+            <skip>true</skip>
+          </configuration>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+  </build>
+
+  <developers>
+    <developer>
+      <name>Inderjeet Singh</name>
+      <organization>Google Inc.</organization>
+    </developer>
+  </developers>
+</project>