diff --git a/pom.xml b/pom.xml
index 471304be..e1e8a461 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
   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>
   <artifactId>google-cloud-spanner-jdbc</artifactId>
-  <version>2.5.5</version><!-- {x-version-update:google-cloud-spanner-jdbc:current} -->
+  <version>2.5.6-SNAPSHOT</version><!-- {x-version-update:google-cloud-spanner-jdbc:current} -->
   <packaging>jar</packaging>
   <name>Google Cloud Spanner JDBC</name>
   <url>https://github.com/googleapis/java-spanner-jdbc</url>
diff --git a/samples/snapshot/pom.xml b/samples/snapshot/pom.xml
index cc6d576c..1da3a663 100644
--- a/samples/snapshot/pom.xml
+++ b/samples/snapshot/pom.xml
@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-spanner-jdbc</artifactId>
-      <version>2.5.5</version>
+      <version>2.5.6-SNAPSHOT</version>
     </dependency>
     <!-- {x-version-update-end} -->
 
diff --git a/versions.txt b/versions.txt
index 93de39f6..6d2b55dc 100644
--- a/versions.txt
+++ b/versions.txt
@@ -1,4 +1,4 @@
 # Format:
 # module:released-version:current-version
 
-google-cloud-spanner-jdbc:2.5.5:2.5.5
+google-cloud-spanner-jdbc:2.5.5:2.5.6-SNAPSHOT