diff --git a/build.gradle b/build.gradle
index 784c8bfef6..dd593aefa2 100644
--- a/build.gradle
+++ b/build.gradle
@@ -101,7 +101,7 @@ subprojects {
     apply plugin: 'de.thetaphi.forbiddenapis'
     apply plugin: 'com.github.spotbugs'
 
-    version = '5.1.0'
+    version = '5.1.1-SNAPSHOT'
     ext {
         bouncyCastleVersion = '1.69'
         commonsCodecVersion = '1.15'
@@ -402,7 +402,9 @@ subprojects {
     }
 
     build {
-        dependsOn 'signPOIPublication'
+        // disabled until next release build - only works when you've configured the signing key in your
+        // user gradle.properties file
+        // dependsOn 'signPOIPublication'
     }
 }
 
diff --git a/osgi/pom.xml b/osgi/pom.xml
index ba4f2171b4..0c97f217db 100644
--- a/osgi/pom.xml
+++ b/osgi/pom.xml
@@ -24,7 +24,7 @@
     <groupId>org.apache.poi</groupId>
     <artifactId>poi-bundle</artifactId>
     <packaging>bundle</packaging>
-    <version>5.1.0</version>
+    <version>5.1.1-SNAPSHOT</version>
 
     <name>Apache POI OSGi bundle</name>
     <properties>
diff --git a/sonar/pom.xml b/sonar/pom.xml
index 1a75f148ee..ba2cf34251 100644
--- a/sonar/pom.xml
+++ b/sonar/pom.xml
@@ -4,7 +4,7 @@
     <groupId>org.apache.poi</groupId>
     <artifactId>poi-parent</artifactId>
     <packaging>pom</packaging>
-    <version>5.1.0</version>
+    <version>5.1.1-SNAPSHOT</version>
     <name>Apache POI - the Java API for Microsoft Documents</name>
     <description>Maven build of Apache POI for Sonar checks</description>
     <url>https://poi.apache.org/</url>