diff --git a/cda-model/pom.xml b/cda-model/pom.xml
index 4d9e2558f22bbed4ab3ed8acbb4369f9aea70407..51f563f72a1a9b8a3906736176c50a87a4d075f8 100644
--- a/cda-model/pom.xml
+++ b/cda-model/pom.xml
@@ -4,14 +4,14 @@
     <parent>
         <artifactId>uml-models</artifactId>
         <groupId>net.ihe.gazelle</groupId>
-        <version>3.1.0</version>
+        <version>3.1.1-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <modelVersion>4.0.0</modelVersion>
     <groupId>net.ihe.gazelle.model</groupId>
     <artifactId>cda-model</artifactId>
-    <version>3.1.0</version>
+    <version>3.1.1-SNAPSHOT</version>
 
     <packaging>jar</packaging>
 
@@ -49,28 +49,28 @@
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>voc-model</artifactId>
-            <version>3.1.0</version>
+            <version>3.1.1-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>common-models</artifactId>
-            <version>3.1.0</version>
+            <version>3.1.1-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>nblock-model</artifactId>
-            <version>3.1.0</version>
+            <version>3.1.1-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>datatypes-model</artifactId>
-            <version>3.1.0</version>
+            <version>3.1.1-SNAPSHOT</version>
         </dependency>
 
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>model-resources</artifactId>
-            <version>3.1.0</version>
+            <version>3.1.1-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>commons-io</groupId>
diff --git a/cdaepsos-model/pom.xml b/cdaepsos-model/pom.xml
index 9052f01342aa8b89c4097fcab0a8559be65ce29d..6dd41b2c02105f9d77ae54d941275bc63266ab4c 100644
--- a/cdaepsos-model/pom.xml
+++ b/cdaepsos-model/pom.xml
@@ -4,14 +4,14 @@
     <parent>
         <artifactId>uml-models</artifactId>
         <groupId>net.ihe.gazelle</groupId>
-        <version>3.1.0</version>
+        <version>3.1.1-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <modelVersion>4.0.0</modelVersion>
     <groupId>net.ihe.gazelle.model</groupId>
     <artifactId>cdaepsos-model</artifactId>
-    <version>3.1.0</version>
+    <version>3.1.1-SNAPSHOT</version>
 
     <packaging>jar</packaging>
     
@@ -38,33 +38,33 @@
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>voc-model</artifactId>
-            <version>3.1.0</version>
+            <version>3.1.1-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>common-models</artifactId>
-            <version>3.1.0</version>
+            <version>3.1.1-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>nblock-model</artifactId>
-            <version>3.1.0</version>
+            <version>3.1.1-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>infr-model</artifactId>
-            <version>3.1.0</version>
+            <version>3.1.1-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>datatypes-model</artifactId>
-            <version>3.1.0</version>
+            <version>3.1.1-SNAPSHOT</version>
         </dependency>
 
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>model-resources</artifactId>
-            <version>3.1.0</version>
+            <version>3.1.1-SNAPSHOT</version>
         </dependency>
 
 
diff --git a/common-models/pom.xml b/common-models/pom.xml
index f22906dad40841fe24d15f9dbaf41771e2197627..fc51a916b82ba6623f348cda9a2bb8af2485123f 100644
--- a/common-models/pom.xml
+++ b/common-models/pom.xml
@@ -4,14 +4,14 @@
     <parent>
         <artifactId>uml-models</artifactId>
         <groupId>net.ihe.gazelle</groupId>
-        <version>3.1.0</version>
+        <version>3.1.1-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <modelVersion>4.0.0</modelVersion>
     <groupId>net.ihe.gazelle.model</groupId>
     <artifactId>common-models</artifactId>
-    <version>3.1.0</version>
+    <version>3.1.1-SNAPSHOT</version>
 
     <packaging>jar</packaging>
 	
@@ -37,7 +37,7 @@
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>model-resources</artifactId>
-            <version>3.1.0</version>
+            <version>3.1.1-SNAPSHOT</version>
         </dependency>
     </dependencies>
 </project>
diff --git a/datatypes-model/pom.xml b/datatypes-model/pom.xml
index 5f13a82515fcf37d4ef5fa2d17fd94b363623ca5..1e14ac3ffa3dfc083c15034be1a70023ace961b4 100644
--- a/datatypes-model/pom.xml
+++ b/datatypes-model/pom.xml
@@ -4,14 +4,14 @@
     <parent>
         <artifactId>uml-models</artifactId>
         <groupId>net.ihe.gazelle</groupId>
-        <version>3.1.0</version>
+        <version>3.1.1-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <modelVersion>4.0.0</modelVersion>
     <groupId>net.ihe.gazelle.model</groupId>
     <artifactId>datatypes-model</artifactId>
-    <version>3.1.0</version>
+    <version>3.1.1-SNAPSHOT</version>
 
     <packaging>jar</packaging>
 
@@ -37,7 +37,7 @@
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>common-models</artifactId>
-            <version>3.1.0</version>
+            <version>3.1.1-SNAPSHOT</version>
         </dependency>
 
 
diff --git a/infr-model/pom.xml b/infr-model/pom.xml
index 7c6168389bfe05da4dff0f87be1204af4d3fc0f2..914eedef01b0033a05fa4a988e4196303806f844 100644
--- a/infr-model/pom.xml
+++ b/infr-model/pom.xml
@@ -4,14 +4,14 @@
     <parent>
         <artifactId>uml-models</artifactId>
         <groupId>net.ihe.gazelle</groupId>
-        <version>3.1.0</version>
+        <version>3.1.1-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <modelVersion>4.0.0</modelVersion>
     <groupId>net.ihe.gazelle.model</groupId>
     <artifactId>infr-model</artifactId>
-    <version>3.1.0</version>
+    <version>3.1.1-SNAPSHOT</version>
 
     <packaging>jar</packaging>
 
@@ -36,7 +36,7 @@
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>datatypes-model</artifactId>
-            <version>3.1.0</version>
+            <version>3.1.1-SNAPSHOT</version>
         </dependency>
 
 
diff --git a/model-resources/pom.xml b/model-resources/pom.xml
index a6813677db9430b7b58fe880a04504a3f9d3da77..6a503ad625804a04a1df98e90b07e21538ff1038 100644
--- a/model-resources/pom.xml
+++ b/model-resources/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <artifactId>uml-models</artifactId>
         <groupId>net.ihe.gazelle</groupId>
-        <version>3.1.0</version>
+        <version>3.1.1-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
@@ -12,7 +12,7 @@
 
     <groupId>net.ihe.gazelle.model</groupId>
     <artifactId>model-resources</artifactId>
-    <version>3.1.0</version>
+    <version>3.1.1-SNAPSHOT</version>
 
 
 
diff --git a/nblock-model/pom.xml b/nblock-model/pom.xml
index 2af7b6f34d650273d58b5e739eb6a93584245f19..bd0902d4569994fcd54d4afea3ee6bfd6c3dd5c8 100644
--- a/nblock-model/pom.xml
+++ b/nblock-model/pom.xml
@@ -4,14 +4,14 @@
     <parent>
         <artifactId>uml-models</artifactId>
         <groupId>net.ihe.gazelle</groupId>
-        <version>3.1.0</version>
+        <version>3.1.1-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <modelVersion>4.0.0</modelVersion>
     <groupId>net.ihe.gazelle.model</groupId>
     <artifactId>nblock-model</artifactId>
-    <version>3.1.0</version>
+    <version>3.1.1-SNAPSHOT</version>
 
     <packaging>jar</packaging>
 
@@ -36,7 +36,7 @@
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>model-resources</artifactId>
-            <version>3.1.0</version>
+            <version>3.1.1-SNAPSHOT</version>
         </dependency>
     </dependencies>
 </project>
diff --git a/pom.xml b/pom.xml
index 4e028192cb26043f4dce248dd3474bb91364b9e4..c626f151faf982d6483fcd94fd2ae3c9ebf7b669 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
     <groupId>net.ihe.gazelle</groupId>
     <artifactId>uml-models</artifactId>
     <name>UML Models</name>
-    <version>3.1.0</version>
+    <version>3.1.1-SNAPSHOT</version>
     <packaging>pom</packaging>
 
     <properties>
@@ -22,7 +22,7 @@
         <connection>scm:git:${git.project.url}</connection>
         <developerConnection>scm:git:${git.project.url}</developerConnection>
         <url>${git.project.url}</url>
-        <tag>3.1.0</tag>
+        <tag>HEAD</tag>
     </scm>
 
     <distributionManagement>
diff --git a/voc-model/pom.xml b/voc-model/pom.xml
index 126398d8b34e66276ebff28d422e3104a712c509..0671f1d4d528aabff786c68c99fa58f0438c8328 100644
--- a/voc-model/pom.xml
+++ b/voc-model/pom.xml
@@ -4,14 +4,14 @@
     <parent>
         <artifactId>uml-models</artifactId>
         <groupId>net.ihe.gazelle</groupId>
-        <version>3.1.0</version>
+        <version>3.1.1-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <modelVersion>4.0.0</modelVersion>
     <groupId>net.ihe.gazelle.model</groupId>
     <artifactId>voc-model</artifactId>
-    <version>3.1.0</version>
+    <version>3.1.1-SNAPSHOT</version>
 
     <packaging>jar</packaging>
 
@@ -36,7 +36,7 @@
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>model-resources</artifactId>
-            <version>3.1.0</version>
+            <version>3.1.1-SNAPSHOT</version>
         </dependency>
     </dependencies>
 </project>