Set version number for guava-parent to 31.1.
diff --git a/android/guava-bom/pom.xml b/android/guava-bom/pom.xml
index 8fde93d..736c02f 100644
--- a/android/guava-bom/pom.xml
+++ b/android/guava-bom/pom.xml
@@ -8,7 +8,7 @@
 
   <groupId>com.google.guava</groupId>
   <artifactId>guava-bom</artifactId>
-  <version>HEAD-android-SNAPSHOT</version>
+  <version>31.1-android</version>
   <packaging>pom</packaging>
   
   <parent>
diff --git a/android/guava-testlib/pom.xml b/android/guava-testlib/pom.xml
index b3211af..1fcf058 100644
--- a/android/guava-testlib/pom.xml
+++ b/android/guava-testlib/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <groupId>com.google.guava</groupId>
     <artifactId>guava-parent</artifactId>
-    <version>HEAD-android-SNAPSHOT</version>
+    <version>31.1-android</version>
   </parent>
   <artifactId>guava-testlib</artifactId>
   <name>Guava Testing Library</name>
diff --git a/android/guava-tests/pom.xml b/android/guava-tests/pom.xml
index 229d0d0..13a8d8d 100644
--- a/android/guava-tests/pom.xml
+++ b/android/guava-tests/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <groupId>com.google.guava</groupId>
     <artifactId>guava-parent</artifactId>
-    <version>HEAD-android-SNAPSHOT</version>
+    <version>31.1-android</version>
   </parent>
   <artifactId>guava-tests</artifactId>
   <name>Guava Unit Tests</name>
diff --git a/android/guava/pom.xml b/android/guava/pom.xml
index 09630e0..39611d4 100644
--- a/android/guava/pom.xml
+++ b/android/guava/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <groupId>com.google.guava</groupId>
     <artifactId>guava-parent</artifactId>
-    <version>HEAD-android-SNAPSHOT</version>
+    <version>31.1-android</version>
   </parent>
   <artifactId>guava</artifactId>
   <packaging>bundle</packaging>
diff --git a/android/pom.xml b/android/pom.xml
index b552c53..3784c9f 100644
--- a/android/pom.xml
+++ b/android/pom.xml
@@ -6,7 +6,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.guava</groupId>
   <artifactId>guava-parent</artifactId>
-  <version>HEAD-android-SNAPSHOT</version>
+  <version>31.1-android</version>
   <packaging>pom</packaging>
   <name>Guava Maven Parent</name>
   <description>Parent for guava artifacts</description>
diff --git a/guava-bom/pom.xml b/guava-bom/pom.xml
index 8c5ea2e..1a3d98e 100644
--- a/guava-bom/pom.xml
+++ b/guava-bom/pom.xml
@@ -8,7 +8,7 @@
 
   <groupId>com.google.guava</groupId>
   <artifactId>guava-bom</artifactId>
-  <version>HEAD-jre-SNAPSHOT</version>
+  <version>31.1-jre</version>
   <packaging>pom</packaging>
   
   <parent>
diff --git a/guava-gwt/pom.xml b/guava-gwt/pom.xml
index 21a4413..5c93f83 100644
--- a/guava-gwt/pom.xml
+++ b/guava-gwt/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <groupId>com.google.guava</groupId>
     <artifactId>guava-parent</artifactId>
-    <version>HEAD-jre-SNAPSHOT</version>
+    <version>31.1-jre</version>
   </parent>
   <artifactId>guava-gwt</artifactId>
   <name>Guava GWT compatible libs</name>
diff --git a/guava-testlib/pom.xml b/guava-testlib/pom.xml
index 18626fa..19ce18a 100644
--- a/guava-testlib/pom.xml
+++ b/guava-testlib/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <groupId>com.google.guava</groupId>
     <artifactId>guava-parent</artifactId>
-    <version>HEAD-jre-SNAPSHOT</version>
+    <version>31.1-jre</version>
   </parent>
   <artifactId>guava-testlib</artifactId>
   <name>Guava Testing Library</name>
diff --git a/guava-tests/pom.xml b/guava-tests/pom.xml
index a03dff2..b7728d8 100644
--- a/guava-tests/pom.xml
+++ b/guava-tests/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <groupId>com.google.guava</groupId>
     <artifactId>guava-parent</artifactId>
-    <version>HEAD-jre-SNAPSHOT</version>
+    <version>31.1-jre</version>
   </parent>
   <artifactId>guava-tests</artifactId>
   <name>Guava Unit Tests</name>
diff --git a/guava/pom.xml b/guava/pom.xml
index 50c031b..81a2005 100644
--- a/guava/pom.xml
+++ b/guava/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <groupId>com.google.guava</groupId>
     <artifactId>guava-parent</artifactId>
-    <version>HEAD-jre-SNAPSHOT</version>
+    <version>31.1-jre</version>
   </parent>
   <artifactId>guava</artifactId>
   <packaging>bundle</packaging>
diff --git a/pom.xml b/pom.xml
index 0175f30..13dd098 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.guava</groupId>
   <artifactId>guava-parent</artifactId>
-  <version>HEAD-jre-SNAPSHOT</version>
+  <version>31.1-jre</version>
   <packaging>pom</packaging>
   <name>Guava Maven Parent</name>
   <description>Parent for guava artifacts</description>