diff --git a/pmd-apex-jorje/pom.xml b/pmd-apex-jorje/pom.xml
index 749ef396a4..0298d90241 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>6.5.0</version>
+    <version>6.6.0-SNAPSHOT</version>
   </parent>
 
   <properties>
diff --git a/pmd-apex/pom.xml b/pmd-apex/pom.xml
index 932f1252c1..cbea57a45f 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>6.5.0</version>
+    <version>6.6.0-SNAPSHOT</version>
   </parent>
 
   <properties>
diff --git a/pmd-core/pom.xml b/pmd-core/pom.xml
index d4d7b43128..5ccebe0e2c 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-cpp/pom.xml b/pmd-cpp/pom.xml
index 6c0f804d48..d07a1d8969 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-cs/pom.xml b/pmd-cs/pom.xml
index 2b02f7b63d..328c06e801 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-dist/pom.xml b/pmd-dist/pom.xml
index ad129e47c4..9da1483ff1 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-doc/pom.xml b/pmd-doc/pom.xml
index ced8ec165f..642a6bd8f2 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <properties>
diff --git a/pmd-fortran/pom.xml b/pmd-fortran/pom.xml
index 66ac56fab0..38c60d8389 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-go/pom.xml b/pmd-go/pom.xml
index b1f99e2629..39ea74070f 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-groovy/pom.xml b/pmd-groovy/pom.xml
index 2d0378c210..5cb8b3de2a 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-java/pom.xml b/pmd-java/pom.xml
index 86db55aee6..5f8b021191 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-java8/pom.xml b/pmd-java8/pom.xml
index 5e5c6e80ee..9b0d5310d2 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <properties>
diff --git a/pmd-javascript/pom.xml b/pmd-javascript/pom.xml
index a41ce1746c..f3590ca568 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-jsp/pom.xml b/pmd-jsp/pom.xml
index d77612b88f..c593722c19 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-matlab/pom.xml b/pmd-matlab/pom.xml
index 01dba22fb9..d3f6d1e404 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-objectivec/pom.xml b/pmd-objectivec/pom.xml
index 0f538cdec8..7f7b5bc551 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-perl/pom.xml b/pmd-perl/pom.xml
index 728fe4255b..e0a9de5e30 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-php/pom.xml b/pmd-php/pom.xml
index c6ee95099e..3d558889b9 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-plsql/pom.xml b/pmd-plsql/pom.xml
index 0e8d4dd788..6440029685 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-python/pom.xml b/pmd-python/pom.xml
index 2761b5f9a7..3a74b8710c 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-ruby/pom.xml b/pmd-ruby/pom.xml
index f81b1a6102..1bf0881357 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <dependencies>
diff --git a/pmd-scala/pom.xml b/pmd-scala/pom.xml
index 5ee3f3b8ee..c9b6abceca 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <properties>
diff --git a/pmd-swift/pom.xml b/pmd-swift/pom.xml
index dd375eaf5d..7c0649bb74 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-test/pom.xml b/pmd-test/pom.xml
index b527797763..d048439a03 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <dependencies>
diff --git a/pmd-ui/pom.xml b/pmd-ui/pom.xml
index 5a1d0140a7..9311063277 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <properties>
diff --git a/pmd-visualforce/pom.xml b/pmd-visualforce/pom.xml
index 04c8a98d1c..0f087891f7 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-vm/pom.xml b/pmd-vm/pom.xml
index afa29d0b89..fc4cb766fa 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pmd-xml/pom.xml b/pmd-xml/pom.xml
index b3926d3e92..e28df3cb9f 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>6.5.0</version>
+        <version>6.6.0-SNAPSHOT</version>
     </parent>
 
     <build>
diff --git a/pom.xml b/pom.xml
index e82a738741..9e42abeb3b 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>6.5.0</version>
+    <version>6.6.0-SNAPSHOT</version>
     <packaging>pom</packaging>
     <name>PMD</name>