diff --git a/cda-model/pom.xml b/cda-model/pom.xml
index f97cf7eca44549b0685a30211cf099d4d87cb697..33e6781c66b784694558488f692accf5d4939d82 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>3.1.1</version>
+        <version>3.1.2-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <modelVersion>4.0.0</modelVersion>
     <groupId>net.ihe.gazelle.model</groupId>
     <artifactId>cda-model</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2-SNAPSHOT</version>
 
     <packaging>jar</packaging>
 
@@ -49,28 +49,28 @@
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>voc-model</artifactId>
-            <version>3.1.1</version>
+            <version>3.1.2-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>common-models</artifactId>
-            <version>3.1.1</version>
+            <version>3.1.2-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>nblock-model</artifactId>
-            <version>3.1.1</version>
+            <version>3.1.2-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>datatypes-model</artifactId>
-            <version>3.1.1</version>
+            <version>3.1.2-SNAPSHOT</version>
         </dependency>
 
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>model-resources</artifactId>
-            <version>3.1.1</version>
+            <version>3.1.2-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>commons-io</groupId>
diff --git a/cdaepsos-model/pom.xml b/cdaepsos-model/pom.xml
index 51e6a2219c0307d361c2b0b2e321e12cdd9847cf..28d1b9ddc0892e740d007182512c4e886ca9d0b3 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>3.1.1</version>
+        <version>3.1.2-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <modelVersion>4.0.0</modelVersion>
     <groupId>net.ihe.gazelle.model</groupId>
     <artifactId>cdaepsos-model</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2-SNAPSHOT</version>
 
     <packaging>jar</packaging>
     
@@ -38,33 +38,33 @@
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>voc-model</artifactId>
-            <version>3.1.1</version>
+            <version>3.1.2-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>common-models</artifactId>
-            <version>3.1.1</version>
+            <version>3.1.2-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>nblock-model</artifactId>
-            <version>3.1.1</version>
+            <version>3.1.2-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>infr-model</artifactId>
-            <version>3.1.1</version>
+            <version>3.1.2-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>datatypes-model</artifactId>
-            <version>3.1.1</version>
+            <version>3.1.2-SNAPSHOT</version>
         </dependency>
 
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>model-resources</artifactId>
-            <version>3.1.1</version>
+            <version>3.1.2-SNAPSHOT</version>
         </dependency>
 
 
diff --git a/common-models/pom.xml b/common-models/pom.xml
index 75237c87c1333ace948850ab190a64e01ac5a967..20d04f0a6fba55d151c9fd259943a6eb3063ff35 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>3.1.1</version>
+        <version>3.1.2-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <modelVersion>4.0.0</modelVersion>
     <groupId>net.ihe.gazelle.model</groupId>
     <artifactId>common-models</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2-SNAPSHOT</version>
 
     <packaging>jar</packaging>
 	
@@ -37,7 +37,7 @@
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>model-resources</artifactId>
-            <version>3.1.1</version>
+            <version>3.1.2-SNAPSHOT</version>
         </dependency>
     </dependencies>
 </project>
diff --git a/datatypes-model/pom.xml b/datatypes-model/pom.xml
index 2321bb16bbc3f7e161ab626950a08a624e4a97d2..8aac22101ab1db6eec4cc3080294f7424ee1ebd4 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>3.1.1</version>
+        <version>3.1.2-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <modelVersion>4.0.0</modelVersion>
     <groupId>net.ihe.gazelle.model</groupId>
     <artifactId>datatypes-model</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2-SNAPSHOT</version>
 
     <packaging>jar</packaging>
 
@@ -37,7 +37,7 @@
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>common-models</artifactId>
-            <version>3.1.1</version>
+            <version>3.1.2-SNAPSHOT</version>
         </dependency>
 
 
diff --git a/infr-model/pom.xml b/infr-model/pom.xml
index 2e36cfefa191677f69e67c2b76b13712fddc6408..8074bf483f70526305a2a57898bf28a453563313 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>3.1.1</version>
+        <version>3.1.2-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <modelVersion>4.0.0</modelVersion>
     <groupId>net.ihe.gazelle.model</groupId>
     <artifactId>infr-model</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2-SNAPSHOT</version>
 
     <packaging>jar</packaging>
 
@@ -36,7 +36,7 @@
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>datatypes-model</artifactId>
-            <version>3.1.1</version>
+            <version>3.1.2-SNAPSHOT</version>
         </dependency>
 
 
diff --git a/model-resources/pom.xml b/model-resources/pom.xml
index 096ea3876fb2d3fe2cd37c1df29ec1488ae1470a..c06424d97a6e598924de90902cba5cf46f13fd3c 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>3.1.1</version>
+        <version>3.1.2-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
@@ -12,7 +12,7 @@
 
     <groupId>net.ihe.gazelle.model</groupId>
     <artifactId>model-resources</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2-SNAPSHOT</version>
 
 
 
diff --git a/nblock-model/pom.xml b/nblock-model/pom.xml
index 373e1ea7de0d73e010daec760794cd29b29b0baf..de2f6b8074e52a58385deee49fa995292d1a0608 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>3.1.1</version>
+        <version>3.1.2-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <modelVersion>4.0.0</modelVersion>
     <groupId>net.ihe.gazelle.model</groupId>
     <artifactId>nblock-model</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2-SNAPSHOT</version>
 
     <packaging>jar</packaging>
 
@@ -36,7 +36,7 @@
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>model-resources</artifactId>
-            <version>3.1.1</version>
+            <version>3.1.2-SNAPSHOT</version>
         </dependency>
     </dependencies>
 </project>
diff --git a/pom.xml b/pom.xml
index 31c735f68bb68f0517d26356aa4dfde92bccffc3..a6cfcce5eb5a7ee4ec7d61147bc7cfcf3fe54d9e 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>3.1.1</version>
+    <version>3.1.2-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>3.1.1</tag>
+        <tag>HEAD</tag>
     </scm>
 
     <distributionManagement>
diff --git a/voc-model/pom.xml b/voc-model/pom.xml
index ce18686f11e4d275c28ba0ebb9d6efd11eb04fc2..d5c2c7b1e560fcb7856d045f44c479a6f2159de9 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>3.1.1</version>
+        <version>3.1.2-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
     <modelVersion>4.0.0</modelVersion>
     <groupId>net.ihe.gazelle.model</groupId>
     <artifactId>voc-model</artifactId>
-    <version>3.1.1</version>
+    <version>3.1.2-SNAPSHOT</version>
 
     <packaging>jar</packaging>
 
@@ -36,7 +36,7 @@
         <dependency>
             <groupId>net.ihe.gazelle.model</groupId>
             <artifactId>model-resources</artifactId>
-            <version>3.1.1</version>
+            <version>3.1.2-SNAPSHOT</version>
         </dependency>
     </dependencies>
 </project>