diff --git a/google-oauth-client-appengine/pom.xml b/google-oauth-client-appengine/pom.xml
index 8b9105a5f..cc9c9b780 100644
--- a/google-oauth-client-appengine/pom.xml
+++ b/google-oauth-client-appengine/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>com.google.oauth-client</groupId>
     <artifactId>google-oauth-client-parent</artifactId>
-    <version>1.39.0</version><!-- {x-version-update:google-oauth-client:current} -->
+    <version>1.40.0-SNAPSHOT</version><!-- {x-version-update:google-oauth-client:current} -->
     <relativePath>../pom.xml</relativePath>
   </parent>
   <artifactId>google-oauth-client-appengine</artifactId>
diff --git a/google-oauth-client-assembly/pom.xml b/google-oauth-client-assembly/pom.xml
index c046c46d5..32eb7f17e 100644
--- a/google-oauth-client-assembly/pom.xml
+++ b/google-oauth-client-assembly/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>com.google.oauth-client</groupId>
     <artifactId>google-oauth-client-parent</artifactId>
-    <version>1.39.0</version><!-- {x-version-update:google-oauth-client:current} -->
+    <version>1.40.0-SNAPSHOT</version><!-- {x-version-update:google-oauth-client:current} -->
     <relativePath>../pom.xml</relativePath>
   </parent>
   <groupId>com.google.oauth-client</groupId>
diff --git a/google-oauth-client-bom/pom.xml b/google-oauth-client-bom/pom.xml
index 2af3941a4..d91e8a0cd 100644
--- a/google-oauth-client-bom/pom.xml
+++ b/google-oauth-client-bom/pom.xml
@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.oauth-client</groupId>
   <artifactId>google-oauth-client-bom</artifactId>
-  <version>1.39.0</version><!-- {x-version-update:google-oauth-client:current} -->
+  <version>1.40.0-SNAPSHOT</version><!-- {x-version-update:google-oauth-client:current} -->
   <packaging>pom</packaging>
 
   <name>Google OAuth Client Library for Java BOM</name>
@@ -63,27 +63,27 @@
       <dependency>
         <groupId>com.google.oauth-client</groupId>
         <artifactId>google-oauth-client</artifactId>
-        <version>1.39.0</version><!-- {x-version-update:google-oauth-client:current} -->
+        <version>1.40.0-SNAPSHOT</version><!-- {x-version-update:google-oauth-client:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.oauth-client</groupId>
         <artifactId>google-oauth-client-appengine</artifactId>
-        <version>1.39.0</version><!-- {x-version-update:google-oauth-client:current} -->
+        <version>1.40.0-SNAPSHOT</version><!-- {x-version-update:google-oauth-client:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.oauth-client</groupId>
         <artifactId>google-oauth-client-java6</artifactId>
-        <version>1.39.0</version><!-- {x-version-update:google-oauth-client:current} -->
+        <version>1.40.0-SNAPSHOT</version><!-- {x-version-update:google-oauth-client:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.oauth-client</groupId>
         <artifactId>google-oauth-client-jetty</artifactId>
-        <version>1.39.0</version><!-- {x-version-update:google-oauth-client:current} -->
+        <version>1.40.0-SNAPSHOT</version><!-- {x-version-update:google-oauth-client:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.oauth-client</groupId>
         <artifactId>google-oauth-client-servlet</artifactId>
-        <version>1.39.0</version><!-- {x-version-update:google-oauth-client:current} -->
+        <version>1.40.0-SNAPSHOT</version><!-- {x-version-update:google-oauth-client:current} -->
       </dependency>
     </dependencies>
   </dependencyManagement>
diff --git a/google-oauth-client-java6/pom.xml b/google-oauth-client-java6/pom.xml
index 1b7d9cf05..d2aa88dbf 100644
--- a/google-oauth-client-java6/pom.xml
+++ b/google-oauth-client-java6/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>com.google.oauth-client</groupId>
     <artifactId>google-oauth-client-parent</artifactId>
-    <version>1.39.0</version><!-- {x-version-update:google-oauth-client:current} -->
+    <version>1.40.0-SNAPSHOT</version><!-- {x-version-update:google-oauth-client:current} -->
     <relativePath>../pom.xml</relativePath>
   </parent>
   <artifactId>google-oauth-client-java6</artifactId>
diff --git a/google-oauth-client-jetty/pom.xml b/google-oauth-client-jetty/pom.xml
index 3ac9737b4..b8328cf96 100644
--- a/google-oauth-client-jetty/pom.xml
+++ b/google-oauth-client-jetty/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>com.google.oauth-client</groupId>
     <artifactId>google-oauth-client-parent</artifactId>
-    <version>1.39.0</version><!-- {x-version-update:google-oauth-client:current} -->
+    <version>1.40.0-SNAPSHOT</version><!-- {x-version-update:google-oauth-client:current} -->
     <relativePath>../pom.xml</relativePath>
   </parent>
   <artifactId>google-oauth-client-jetty</artifactId>
diff --git a/google-oauth-client-servlet/pom.xml b/google-oauth-client-servlet/pom.xml
index 8be30fb34..b22becf87 100644
--- a/google-oauth-client-servlet/pom.xml
+++ b/google-oauth-client-servlet/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>com.google.oauth-client</groupId>
     <artifactId>google-oauth-client-parent</artifactId>
-    <version>1.39.0</version><!-- {x-version-update:google-oauth-client:current} -->
+    <version>1.40.0-SNAPSHOT</version><!-- {x-version-update:google-oauth-client:current} -->
     <relativePath>../pom.xml</relativePath>
   </parent>
   <artifactId>google-oauth-client-servlet</artifactId>
diff --git a/google-oauth-client/pom.xml b/google-oauth-client/pom.xml
index c8786e47e..0871ac87b 100644
--- a/google-oauth-client/pom.xml
+++ b/google-oauth-client/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>com.google.oauth-client</groupId>
     <artifactId>google-oauth-client-parent</artifactId>
-    <version>1.39.0</version><!-- {x-version-update:google-oauth-client:current} -->
+    <version>1.40.0-SNAPSHOT</version><!-- {x-version-update:google-oauth-client:current} -->
     <relativePath>../pom.xml</relativePath>
   </parent>
   <artifactId>google-oauth-client</artifactId>
diff --git a/pom.xml b/pom.xml
index cef6658c5..07cea23b0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
 
   <groupId>com.google.oauth-client</groupId>
   <artifactId>google-oauth-client-parent</artifactId>
-  <version>1.39.0</version><!-- {x-version-update:google-oauth-client:current} -->
+  <version>1.40.0-SNAPSHOT</version><!-- {x-version-update:google-oauth-client:current} -->
   <packaging>pom</packaging>
   <name>Parent for the Google OAuth Client Library for Java</name>
   <description>Google OAuth Client Library for Java</description>
diff --git a/samples/dailymotion-cmdline-sample/pom.xml b/samples/dailymotion-cmdline-sample/pom.xml
index 15f46181b..cbaf03fc6 100644
--- a/samples/dailymotion-cmdline-sample/pom.xml
+++ b/samples/dailymotion-cmdline-sample/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>com.google.oauth-client</groupId>
     <artifactId>google-oauth-client-parent</artifactId>
-    <version>1.39.0</version><!-- {x-version-update:google-oauth-client:current} -->
+    <version>1.40.0-SNAPSHOT</version><!-- {x-version-update:google-oauth-client:current} -->
     <relativePath>../../pom.xml</relativePath>
   </parent>
   <artifactId>dailymotion-simple-cmdline-sample</artifactId>
diff --git a/samples/keycloak-pkce-cmdline-sample/pom.xml b/samples/keycloak-pkce-cmdline-sample/pom.xml
index 09fab15e7..ba866216d 100644
--- a/samples/keycloak-pkce-cmdline-sample/pom.xml
+++ b/samples/keycloak-pkce-cmdline-sample/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>com.google.oauth-client</groupId>
     <artifactId>google-oauth-client-parent</artifactId>
-    <version>1.39.0</version><!-- {x-version-update:google-oauth-client:current} -->
+    <version>1.40.0-SNAPSHOT</version><!-- {x-version-update:google-oauth-client:current} -->
     <relativePath>../../pom.xml</relativePath>
   </parent>
   <artifactId>keycloak-pkce-cmdline-sample</artifactId>
diff --git a/versions.txt b/versions.txt
index 5ab8c4652..53a732398 100644
--- a/versions.txt
+++ b/versions.txt
@@ -1,4 +1,4 @@
 # Format:
 # module:released-version:current-version
 
-google-oauth-client:1.39.0:1.39.0
+google-oauth-client:1.39.0:1.40.0-SNAPSHOT