diff --git a/io/pom.xml b/io/pom.xml
index 5daeef487..1b0d3f6a5 100644
--- a/io/pom.xml
+++ b/io/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.helgoland</groupId>
         <artifactId>helgoland-parent</artifactId>
-        <version>3.4.0-SNAPSHOT</version>
+        <version>3.4.0</version>
     </parent>
     <artifactId>helgoland-io</artifactId>
     <packaging>jar</packaging>
diff --git a/pom.xml b/pom.xml
index 65b2b4747..295d7e2e5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -9,7 +9,7 @@
     
     <groupId>org.n52.sensorweb-server.helgoland</groupId>
     <artifactId>helgoland-parent</artifactId>
-    <version>3.4.0-SNAPSHOT</version>
+    <version>3.4.0</version>
     <packaging>pom</packaging>
     <name>Sensor Web Server Helgoland</name>
     <url>https://52north.org/research/research-labs/sensor-web/</url>
@@ -47,7 +47,7 @@
         <connection>scm:git:https://github.com/52North/series-rest-api.git</connection>
         <developerConnection>scm:git:https://github.com/52North/series-rest-api.git</developerConnection>
         <url>https://github.com/52North/series-rest-api</url>
-        <tag>HEAD</tag>
+        <tag>v3.4.0</tag>
     </scm>
     
     <properties>
diff --git a/rest/pom.xml b/rest/pom.xml
index 00bf04eec..fc9eade1d 100644
--- a/rest/pom.xml
+++ b/rest/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.helgoland</groupId>
         <artifactId>helgoland-parent</artifactId>
-        <version>3.4.0-SNAPSHOT</version>
+        <version>3.4.0</version>
     </parent>
     <artifactId>helgoland-rest</artifactId>
     <packaging>jar</packaging>
diff --git a/spi/pom.xml b/spi/pom.xml
index be7604b7b..08407436c 100644
--- a/spi/pom.xml
+++ b/spi/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.helgoland</groupId>
         <artifactId>helgoland-parent</artifactId>
-        <version>3.4.0-SNAPSHOT</version>
+        <version>3.4.0</version>
     </parent>
     <artifactId>helgoland-spi</artifactId>
     <name>Sensor Web Server Helgoland - SPI module</name>
diff --git a/web-resources/pom.xml b/web-resources/pom.xml
index bd14854f8..9781b6239 100644
--- a/web-resources/pom.xml
+++ b/web-resources/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <artifactId>helgoland-parent</artifactId>
         <groupId>org.n52.sensorweb-server.helgoland</groupId>
-        <version>3.4.0-SNAPSHOT</version>
+        <version>3.4.0</version>
     </parent>
     <packaging>jar</packaging>
     <name>Sensor Web Server Helgoland - Web Resources</name>
diff --git a/xml-pdf-format/pom.xml b/xml-pdf-format/pom.xml
index 597de045e..82a0f53c8 100644
--- a/xml-pdf-format/pom.xml
+++ b/xml-pdf-format/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.helgoland</groupId>
         <artifactId>helgoland-parent</artifactId>
-        <version>3.4.0-SNAPSHOT</version>
+        <version>3.4.0</version>
     </parent>
     <artifactId>helgoland-xml-pdf-format</artifactId>
     <packaging>jar</packaging>