diff --git a/pmd-apex-jorje/pom.xml b/pmd-apex-jorje/pom.xml
index 19f5479a0a..b00cc9cd2c 100644
--- a/pmd-apex-jorje/pom.xml
+++ b/pmd-apex-jorje/pom.xml
@@ -8,7 +8,7 @@
   <parent>
     <groupId>net.sourceforge.pmd</groupId>
     <artifactId>pmd</artifactId>
-    <version>6.3.0</version>
+    <version>6.4.0-SNAPSHOT</version>
   </parent>
 
   <properties>
diff --git a/pmd-apex/pom.xml b/pmd-apex/pom.xml
index bd21a0be41..8bb30068da 100644
--- a/pmd-apex/pom.xml
+++ b/pmd-apex/pom.xml
@@ -7,7 +7,7 @@
   <parent>
     <groupId>net.sourceforge.pmd</groupId>
     <artifactId>pmd</artifactId>
-    <version>6.3.0</version>
+    <version>6.4.0-SNAPSHOT</version>
   </parent>
 
   <properties>
diff --git a/pmd-core/pom.xml b/pmd-core/pom.xml
index e42d3f3928..29d8580eb1 100644
--- a/pmd-core/pom.xml
+++ b/pmd-core/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-cpp/pom.xml b/pmd-cpp/pom.xml
index 36c477af1e..b03582eaf5 100644
--- a/pmd-cpp/pom.xml
+++ b/pmd-cpp/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-cs/pom.xml b/pmd-cs/pom.xml
index e6b0007b88..322815d5fd 100644
--- a/pmd-cs/pom.xml
+++ b/pmd-cs/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-dist/pom.xml b/pmd-dist/pom.xml
index 795590d429..7b02dccac9 100644
--- a/pmd-dist/pom.xml
+++ b/pmd-dist/pom.xml
@@ -8,7 +8,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-doc/pom.xml b/pmd-doc/pom.xml
index 2e2ff14f39..6b1ddc994e 100644
--- a/pmd-doc/pom.xml
+++ b/pmd-doc/pom.xml
@@ -8,7 +8,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <properties>
diff --git a/pmd-fortran/pom.xml b/pmd-fortran/pom.xml
index ba158c691f..58140d42c0 100644
--- a/pmd-fortran/pom.xml
+++ b/pmd-fortran/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-go/pom.xml b/pmd-go/pom.xml
index 984d43f408..134dc79d3d 100644
--- a/pmd-go/pom.xml
+++ b/pmd-go/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-groovy/pom.xml b/pmd-groovy/pom.xml
index e01cc4a14d..dbed31d5dc 100644
--- a/pmd-groovy/pom.xml
+++ b/pmd-groovy/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-java/pom.xml b/pmd-java/pom.xml
index 143f975f9c..02f256b4e4 100644
--- a/pmd-java/pom.xml
+++ b/pmd-java/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-java8/pom.xml b/pmd-java8/pom.xml
index 9956a1c3db..7004219bdb 100644
--- a/pmd-java8/pom.xml
+++ b/pmd-java8/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <properties>
diff --git a/pmd-javascript/pom.xml b/pmd-javascript/pom.xml
index e890725da9..eeb32aecb0 100644
--- a/pmd-javascript/pom.xml
+++ b/pmd-javascript/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-jsp/pom.xml b/pmd-jsp/pom.xml
index 37ed2fe0aa..6443b72a17 100644
--- a/pmd-jsp/pom.xml
+++ b/pmd-jsp/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-matlab/pom.xml b/pmd-matlab/pom.xml
index dead355e54..51ac22202b 100644
--- a/pmd-matlab/pom.xml
+++ b/pmd-matlab/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-objectivec/pom.xml b/pmd-objectivec/pom.xml
index c2f80a2859..2d55fbf456 100644
--- a/pmd-objectivec/pom.xml
+++ b/pmd-objectivec/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-perl/pom.xml b/pmd-perl/pom.xml
index a47e91dfd1..293daa2750 100644
--- a/pmd-perl/pom.xml
+++ b/pmd-perl/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-php/pom.xml b/pmd-php/pom.xml
index 4243879a6a..1aac0cfacb 100644
--- a/pmd-php/pom.xml
+++ b/pmd-php/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-plsql/pom.xml b/pmd-plsql/pom.xml
index 24d61b2126..8f2cee8bb7 100644
--- a/pmd-plsql/pom.xml
+++ b/pmd-plsql/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-python/pom.xml b/pmd-python/pom.xml
index f7fa5ee058..5f9c8aeae5 100644
--- a/pmd-python/pom.xml
+++ b/pmd-python/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-ruby/pom.xml b/pmd-ruby/pom.xml
index 2f003f3e0e..ff2a491c12 100644
--- a/pmd-ruby/pom.xml
+++ b/pmd-ruby/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <dependencies>
diff --git a/pmd-scala/pom.xml b/pmd-scala/pom.xml
index fb2e4fb032..3df2b6648b 100644
--- a/pmd-scala/pom.xml
+++ b/pmd-scala/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <properties>
diff --git a/pmd-swift/pom.xml b/pmd-swift/pom.xml
index 53a7d4daef..9f1f29d4f6 100644
--- a/pmd-swift/pom.xml
+++ b/pmd-swift/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-test/pom.xml b/pmd-test/pom.xml
index 291bf9373c..a971de8c9e 100644
--- a/pmd-test/pom.xml
+++ b/pmd-test/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <dependencies>
diff --git a/pmd-ui/pom.xml b/pmd-ui/pom.xml
index 57f04519a3..9982357db3 100644
--- a/pmd-ui/pom.xml
+++ b/pmd-ui/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <properties>
diff --git a/pmd-visualforce/pom.xml b/pmd-visualforce/pom.xml
index 58641d1025..051d8d64b0 100644
--- a/pmd-visualforce/pom.xml
+++ b/pmd-visualforce/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-vm/pom.xml b/pmd-vm/pom.xml
index a35053ca45..66b330bb81 100644
--- a/pmd-vm/pom.xml
+++ b/pmd-vm/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-xml/pom.xml b/pmd-xml/pom.xml
index 8eb50e588b..069cf822dc 100644
--- a/pmd-xml/pom.xml
+++ b/pmd-xml/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
         <artifactId>pmd</artifactId>
-        <version>6.3.0</version>
+        <version>6.4.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pom.xml b/pom.xml
index 2edb40b352..a9fca2489d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>net.sourceforge.pmd</groupId>
     <artifactId>pmd</artifactId>
-    <version>6.3.0</version>
+    <version>6.4.0-SNAPSHOT</version>
     <packaging>pom</packaging>
     <name>PMD</name>
 
@@ -234,7 +234,7 @@ Additionally it includes CPD, the copy-paste-detector. CPD finds duplicated code
         <connection>scm:git:git://github.com/pmd/pmd.git</connection>
         <developerConnection>scm:git:ssh://git@github.com/pmd/pmd.git</developerConnection>
         <url>https://github.com/pmd/pmd</url>
-        <tag>pmd_releases/6.3.0</tag>
+        <tag>HEAD</tag>
     </scm>
     <distributionManagement>
         <snapshotRepository>