[maven-release-plugin] prepare for next development iteration
diff --git a/value/annotations/pom.xml b/value/annotations/pom.xml
index e188e4f..a0b676a 100644
--- a/value/annotations/pom.xml
+++ b/value/annotations/pom.xml
@@ -20,11 +20,11 @@
   <parent>
     <groupId>com.google.auto.value</groupId>
     <artifactId>auto-value-parent</artifactId>
-    <version>1.9</version>
+    <version>HEAD-SNAPSHOT</version>
   </parent>
 
   <artifactId>auto-value-annotations</artifactId>
-  <version>1.9</version>
+  <version>HEAD-SNAPSHOT</version>
   <name>AutoValue Annotations</name>
   <description>
     Immutable value-type code generation for Java 1.7+.
@@ -39,7 +39,7 @@
     <url>http://github.com/google/auto</url>
     <connection>scm:git:git://github.com/google/auto.git</connection>
     <developerConnection>scm:git:ssh://[email protected]/google/auto.git</developerConnection>
-    <tag>auto-value-1.9</tag>
+    <tag>HEAD</tag>
   </scm>
   <build>
     <sourceDirectory>../src/main/java</sourceDirectory>
diff --git a/value/pom.xml b/value/pom.xml
index b7ede52..42ee676 100644
--- a/value/pom.xml
+++ b/value/pom.xml
@@ -19,7 +19,7 @@
 
   <groupId>com.google.auto.value</groupId>
   <artifactId>auto-value-parent</artifactId>
-  <version>1.9</version>
+  <version>HEAD-SNAPSHOT</version>
   <name>AutoValue Parent</name>
   <description>
     Immutable value-type code generation for Java 7+.
@@ -38,7 +38,7 @@
     <url>http://github.com/google/auto</url>
     <connection>scm:git:git://github.com/google/auto.git</connection>
     <developerConnection>scm:git:ssh://[email protected]/google/auto.git</developerConnection>
-    <tag>auto-value-1.9</tag>
+    <tag>HEAD</tag>
   </scm>
 
   <issueManagement>
diff --git a/value/processor/pom.xml b/value/processor/pom.xml
index 1da7b38..ad73d55 100644
--- a/value/processor/pom.xml
+++ b/value/processor/pom.xml
@@ -20,11 +20,11 @@
   <parent>
     <groupId>com.google.auto.value</groupId>
     <artifactId>auto-value-parent</artifactId>
-    <version>1.9</version>
+    <version>HEAD-SNAPSHOT</version>
   </parent>
 
   <artifactId>auto-value</artifactId>
-  <version>1.9</version>
+  <version>HEAD-SNAPSHOT</version>
   <name>AutoValue Processor</name>
   <description>
     Immutable value-type code generation for Java 1.7+.
@@ -35,7 +35,7 @@
     <url>http://github.com/google/auto</url>
     <connection>scm:git:git://github.com/google/auto.git</connection>
     <developerConnection>scm:git:ssh://[email protected]/google/auto.git</developerConnection>
-    <tag>auto-value-1.9</tag>
+    <tag>HEAD</tag>
   </scm>
 
   <properties>
diff --git a/value/src/it/functional/pom.xml b/value/src/it/functional/pom.xml
index ba83a4f..2420014 100644
--- a/value/src/it/functional/pom.xml
+++ b/value/src/it/functional/pom.xml
@@ -21,14 +21,14 @@
   <parent>
     <groupId>com.google.auto.value</groupId>
     <artifactId>auto-value-parent</artifactId>
-    <version>1.9</version>
+    <version>HEAD-SNAPSHOT</version>
     <relativePath>../../../pom.xml</relativePath>
   </parent>
   <url>https://github.com/google/auto/tree/master/value</url>
 
   <groupId>com.google.auto.value.it.functional</groupId>
   <artifactId>functional</artifactId>
-  <version>1.9</version>
+  <version>HEAD-SNAPSHOT</version>
   <name>Auto-Value Functional Integration Test</name>
   <properties>
     <kotlin.version>1.6.0</kotlin.version>
diff --git a/value/src/it/gwtserializer/pom.xml b/value/src/it/gwtserializer/pom.xml
index 19074c1..c548161 100644
--- a/value/src/it/gwtserializer/pom.xml
+++ b/value/src/it/gwtserializer/pom.xml
@@ -21,14 +21,14 @@
   <parent>
     <groupId>com.google.auto.value</groupId>
     <artifactId>auto-value-parent</artifactId>
-    <version>1.9</version>
+    <version>HEAD-SNAPSHOT</version>
     <relativePath>../../../pom.xml</relativePath>
   </parent>
   <url>https://github.com/google/auto/tree/master/value</url>
 
   <groupId>com.google.auto.value.it.gwtserializer</groupId>
   <artifactId>gwtserializer</artifactId>
-  <version>1.9</version>
+  <version>HEAD-SNAPSHOT</version>
   <name>Auto-Value GWT-RPC Serialization Integration Test</name>
   <dependencyManagement>
     <dependencies>