diff --git a/bindings/pom.xml b/bindings/pom.xml
index 9b33315554..364ab1c026 100644
--- a/bindings/pom.xml
+++ b/bindings/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-parent</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-bindings</artifactId>
     <packaging>pom</packaging>
diff --git a/bindings/register/pom.xml b/bindings/register/pom.xml
index 1222bb0d5d..52783c1a73 100644
--- a/bindings/register/pom.xml
+++ b/bindings/register/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-bindings</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-binding-register</artifactId>
diff --git a/coding/kvp/pom.xml b/coding/kvp/pom.xml
index d83c0b9288..553199d68f 100644
--- a/coding/kvp/pom.xml
+++ b/coding/kvp/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-coding</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-coding-kvp</artifactId>
diff --git a/coding/netcdf/api/pom.xml b/coding/netcdf/api/pom.xml
index 14ef9e2496..e4c3a3c175 100644
--- a/coding/netcdf/api/pom.xml
+++ b/coding/netcdf/api/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-netcdf</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-api-netcdf</artifactId>
diff --git a/coding/netcdf/coding/pom.xml b/coding/netcdf/coding/pom.xml
index f6da21715c..4f2c3db7c6 100644
--- a/coding/netcdf/coding/pom.xml
+++ b/coding/netcdf/coding/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-netcdf</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-coding-netcdf</artifactId>
diff --git a/coding/netcdf/oceansites/pom.xml b/coding/netcdf/oceansites/pom.xml
index 1bfb709ef0..ce022ee9c1 100644
--- a/coding/netcdf/oceansites/pom.xml
+++ b/coding/netcdf/oceansites/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-netcdf</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-coding-oceansites</artifactId>
diff --git a/coding/netcdf/pom.xml b/coding/netcdf/pom.xml
index eb86b044eb..ae9b011b4f 100644
--- a/coding/netcdf/pom.xml
+++ b/coding/netcdf/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-coding</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-netcdf</artifactId>
diff --git a/coding/pom.xml b/coding/pom.xml
index 9fb939c134..c8ec487484 100644
--- a/coding/pom.xml
+++ b/coding/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-parent</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-coding</artifactId>
     <packaging>pom</packaging>
diff --git a/coding/profile/pom.xml b/coding/profile/pom.xml
index 866093f2fa..c7317ec1ad 100644
--- a/coding/profile/pom.xml
+++ b/coding/profile/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-coding</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-profile-coding</artifactId>
diff --git a/converter/eprtr/pom.xml b/converter/eprtr/pom.xml
index babd8c00a1..fa0d5360ea 100644
--- a/converter/eprtr/pom.xml
+++ b/converter/eprtr/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-converter</artifactId>
-          <version>5.5.1-SNAPSHOT</version>
+          <version>5.5.1</version>
     </parent>
     <artifactId>sos-eprtr</artifactId>
     <packaging>jar</packaging>
diff --git a/converter/identifier-modifier/abstract-identifier/pom.xml b/converter/identifier-modifier/abstract-identifier/pom.xml
index a84f58618b..00a1996c99 100644
--- a/converter/identifier-modifier/abstract-identifier/pom.xml
+++ b/converter/identifier-modifier/abstract-identifier/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-identifier-modifier</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-abstract-identifier</artifactId>
     <packaging>jar</packaging>
diff --git a/converter/identifier-modifier/ereporting-identifier/pom.xml b/converter/identifier-modifier/ereporting-identifier/pom.xml
index 6f2574dac3..915fd44cc1 100644
--- a/converter/identifier-modifier/ereporting-identifier/pom.xml
+++ b/converter/identifier-modifier/ereporting-identifier/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-identifier-modifier</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-ereporting-identifier</artifactId>
     <packaging>jar</packaging>
diff --git a/converter/identifier-modifier/flexible-identifier/pom.xml b/converter/identifier-modifier/flexible-identifier/pom.xml
index c663058a6c..761bb4182f 100644
--- a/converter/identifier-modifier/flexible-identifier/pom.xml
+++ b/converter/identifier-modifier/flexible-identifier/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-identifier-modifier</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-flexible-identifier</artifactId>
     <packaging>jar</packaging>
diff --git a/converter/identifier-modifier/pom.xml b/converter/identifier-modifier/pom.xml
index 38e50ffe5e..2085f273b7 100644
--- a/converter/identifier-modifier/pom.xml
+++ b/converter/identifier-modifier/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-converter</artifactId>
-         <version>5.5.1-SNAPSHOT</version>
+         <version>5.5.1</version>
     </parent>
     <artifactId>sos-identifier-modifier</artifactId>
     <packaging>pom</packaging>
diff --git a/converter/identifier-modifier/prefixed-identifier/pom.xml b/converter/identifier-modifier/prefixed-identifier/pom.xml
index 6a9d3b54a5..40769372f4 100644
--- a/converter/identifier-modifier/prefixed-identifier/pom.xml
+++ b/converter/identifier-modifier/prefixed-identifier/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-identifier-modifier</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-prefixed-identifier</artifactId>
     <packaging>jar</packaging>
diff --git a/converter/observation/pom.xml b/converter/observation/pom.xml
index b0bfc76f3e..f7ad679aba 100644
--- a/converter/observation/pom.xml
+++ b/converter/observation/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-converter</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-observation-converter</artifactId>
     <name>52°North SOS - Observation Converter</name>
diff --git a/converter/pom.xml b/converter/pom.xml
index 72302053c4..f1a61b7dc9 100644
--- a/converter/pom.xml
+++ b/converter/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-parent</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-converter</artifactId>
     <packaging>pom</packaging>
diff --git a/converter/procedure-description/pom.xml b/converter/procedure-description/pom.xml
index e0a5e3b5ed..4d4b31517d 100644
--- a/converter/procedure-description/pom.xml
+++ b/converter/procedure-description/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-converter</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-procedure-description-converter</artifactId>
     <packaging>jar</packaging>
diff --git a/converter/split-and-merge/pom.xml b/converter/split-and-merge/pom.xml
index 97d0b9619d..83615d2ef0 100644
--- a/converter/split-and-merge/pom.xml
+++ b/converter/split-and-merge/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-converter</artifactId>
-          <version>5.5.1-SNAPSHOT</version>
+          <version>5.5.1</version>
     </parent>
     <artifactId>sos-split-and-merge</artifactId>
     <packaging>jar</packaging>
diff --git a/converter/transformation/coordinate/pom.xml b/converter/transformation/coordinate/pom.xml
index 8f8800cd5d..0d3339e79c 100644
--- a/converter/transformation/coordinate/pom.xml
+++ b/converter/transformation/coordinate/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-transformation</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-request-response-coordinate-transformer</artifactId>
     <packaging>jar</packaging>
diff --git a/converter/transformation/pom.xml b/converter/transformation/pom.xml
index 9861955e0c..c3ce2dea0b 100644
--- a/converter/transformation/pom.xml
+++ b/converter/transformation/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-converter</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-transformation</artifactId>
     <packaging>pom</packaging>
diff --git a/core/api/pom.xml b/core/api/pom.xml
index 31abd252ba..126dc657fe 100644
--- a/core/api/pom.xml
+++ b/core/api/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-core</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-api</artifactId>
diff --git a/core/cache/pom.xml b/core/cache/pom.xml
index 8ad71917b4..28dc738fa8 100644
--- a/core/cache/pom.xml
+++ b/core/cache/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-core</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
      <artifactId>sos-cache</artifactId>
     <name>52°North SOS - Cache</name>
diff --git a/core/pom.xml b/core/pom.xml
index 493a996afe..1169ec2c95 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -4,7 +4,7 @@
     <parent>
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         <artifactId>sos-parent</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-core</artifactId>
     <packaging>pom</packaging>
diff --git a/core/test/pom.xml b/core/test/pom.xml
index feb25e7d80..193b50a9e3 100644
--- a/core/test/pom.xml
+++ b/core/test/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-core</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-test</artifactId>
     <name>52°North SOS - Test Module</name>
diff --git a/extensions/inspire/code/pom.xml b/extensions/inspire/code/pom.xml
index 89dae6caa3..8d1936878b 100644
--- a/extensions/inspire/code/pom.xml
+++ b/extensions/inspire/code/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-inspire</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-inspire-code</artifactId>
diff --git a/extensions/inspire/pom.xml b/extensions/inspire/pom.xml
index 4836827e2e..ae448c9360 100644
--- a/extensions/inspire/pom.xml
+++ b/extensions/inspire/pom.xml
@@ -3,11 +3,11 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-extensions</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-inspire</artifactId>
-     <version>5.5.1-SNAPSHOT</version>
+     <version>5.5.1</version>
     <packaging>pom</packaging>
     <name>52°North SOS - SOS 2.0 Inspire extension</name>
     <description>52°North Sensor Observation Service Inspire extension module</description>
diff --git a/extensions/pom.xml b/extensions/pom.xml
index b795d3b993..b0da1e750c 100644
--- a/extensions/pom.xml
+++ b/extensions/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-parent</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-extensions</artifactId>
     <packaging>pom</packaging>
diff --git a/handler/pom.xml b/handler/pom.xml
index c6e5f389a1..55691f4177 100644
--- a/handler/pom.xml
+++ b/handler/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-parent</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
      <artifactId>sos-handler</artifactId>
     <packaging>jar</packaging>
diff --git a/hibernate/c3p0/pom.xml b/hibernate/c3p0/pom.xml
index 1ab1050e04..c4ba7d8c4a 100644
--- a/hibernate/c3p0/pom.xml
+++ b/hibernate/c3p0/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-hibernate</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-hibernate-geodb-c3p0</artifactId>
diff --git a/hibernate/common/pom.xml b/hibernate/common/pom.xml
index b7ac60e8cc..e5371c1c41 100644
--- a/hibernate/common/pom.xml
+++ b/hibernate/common/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-hibernate</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
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     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-hibernate-common</artifactId>
diff --git a/hibernate/datasource/common/pom.xml b/hibernate/datasource/common/pom.xml
index ef385cc275..1ae61828eb 100644
--- a/hibernate/datasource/common/pom.xml
+++ b/hibernate/datasource/common/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-hibernate-datasource</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
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     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-hibernate-datasource-common</artifactId>
diff --git a/hibernate/datasource/h2/pom.xml b/hibernate/datasource/h2/pom.xml
index d70f0cbcad..ede0db95b3 100644
--- a/hibernate/datasource/h2/pom.xml
+++ b/hibernate/datasource/h2/pom.xml
@@ -3,7 +3,7 @@
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         <artifactId>sos-hibernate-datasource</artifactId>
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+        <version>5.5.1</version>
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     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-hibernate-datasource-h2</artifactId>
diff --git a/hibernate/datasource/mysql/pom.xml b/hibernate/datasource/mysql/pom.xml
index 4496e8d22e..da5ba173df 100644
--- a/hibernate/datasource/mysql/pom.xml
+++ b/hibernate/datasource/mysql/pom.xml
@@ -3,7 +3,7 @@
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         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-hibernate-datasource</artifactId>
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+        <version>5.5.1</version>
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     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-hibernate-datasource-mysql</artifactId>
diff --git a/hibernate/datasource/oracle/pom.xml b/hibernate/datasource/oracle/pom.xml
index 7f0956ffd9..7c44dd7632 100644
--- a/hibernate/datasource/oracle/pom.xml
+++ b/hibernate/datasource/oracle/pom.xml
@@ -3,7 +3,7 @@
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         <artifactId>sos-hibernate-datasource</artifactId>
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+        <version>5.5.1</version>
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     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-hibernate-datasource-oracle</artifactId>
diff --git a/hibernate/datasource/pom.xml b/hibernate/datasource/pom.xml
index 9d8d63bb27..78be60439a 100644
--- a/hibernate/datasource/pom.xml
+++ b/hibernate/datasource/pom.xml
@@ -3,7 +3,7 @@
     <parent>
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+        <version>5.5.1</version>
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     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-hibernate-datasource</artifactId>
diff --git a/hibernate/datasource/postgres/pom.xml b/hibernate/datasource/postgres/pom.xml
index a97bc8fa04..4a11c739e4 100644
--- a/hibernate/datasource/postgres/pom.xml
+++ b/hibernate/datasource/postgres/pom.xml
@@ -3,7 +3,7 @@
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         <artifactId>sos-hibernate-datasource</artifactId>
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+        <version>5.5.1</version>
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     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-hibernate-datasource-postgres</artifactId>
diff --git a/hibernate/datasource/sqlserver/pom.xml b/hibernate/datasource/sqlserver/pom.xml
index d504ad62b0..6999ca1f9e 100644
--- a/hibernate/datasource/sqlserver/pom.xml
+++ b/hibernate/datasource/sqlserver/pom.xml
@@ -3,7 +3,7 @@
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         <artifactId>sos-hibernate-datasource</artifactId>
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+        <version>5.5.1</version>
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     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-hibernate-datasource-sqlserver</artifactId>
diff --git a/hibernate/feature/pom.xml b/hibernate/feature/pom.xml
index f1ef7df9bc..d4d794ad44 100644
--- a/hibernate/feature/pom.xml
+++ b/hibernate/feature/pom.xml
@@ -3,7 +3,7 @@
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         <artifactId>sos-hibernate</artifactId>
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+        <version>5.5.1</version>
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     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-hibernate-feature</artifactId>
diff --git a/hibernate/h2/pom.xml b/hibernate/h2/pom.xml
index 85cf6e814c..40cbcf1620 100644
--- a/hibernate/h2/pom.xml
+++ b/hibernate/h2/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-hibernate</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-hibernate-h2</artifactId>
     <name>52°North SOS - Hibernate H2</name>
diff --git a/hibernate/handler/pom.xml b/hibernate/handler/pom.xml
index 0de71793c3..9e48c4cdab 100644
--- a/hibernate/handler/pom.xml
+++ b/hibernate/handler/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-hibernate</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-hibernate-handler</artifactId>
diff --git a/hibernate/pom.xml b/hibernate/pom.xml
index 17e95301d8..414a575305 100644
--- a/hibernate/pom.xml
+++ b/hibernate/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-parent</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-hibernate</artifactId>
     <packaging>pom</packaging>
diff --git a/hibernate/session-factory/pom.xml b/hibernate/session-factory/pom.xml
index 63d416e4a1..11e2f5adc1 100644
--- a/hibernate/session-factory/pom.xml
+++ b/hibernate/session-factory/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-hibernate</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-hibernate-session-factory</artifactId>
diff --git a/hibernate/utils/pom.xml b/hibernate/utils/pom.xml
index cc1f1e7419..f95811eec2 100644
--- a/hibernate/utils/pom.xml
+++ b/hibernate/utils/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-hibernate</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-hibernate-utils</artifactId>
     <name>52°North SOS - Hibernate Utils</name>
diff --git a/operations/aqd-v10/pom.xml b/operations/aqd-v10/pom.xml
index eb2b7ba2f1..22da07f718 100644
--- a/operations/aqd-v10/pom.xml
+++ b/operations/aqd-v10/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-operations</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-aqd-v10</artifactId>
diff --git a/operations/core-v100/pom.xml b/operations/core-v100/pom.xml
index dc787a4a5c..df922af3e5 100644
--- a/operations/core-v100/pom.xml
+++ b/operations/core-v100/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-operations</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
      <artifactId>sos-core-v100</artifactId>
diff --git a/operations/core-v20/pom.xml b/operations/core-v20/pom.xml
index 72f2df4341..76bda675ec 100644
--- a/operations/core-v20/pom.xml
+++ b/operations/core-v20/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-operations</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
      <artifactId>sos-core-v20</artifactId>
diff --git a/operations/enhanced-v20/pom.xml b/operations/enhanced-v20/pom.xml
index f29cd807e6..aa151a342b 100644
--- a/operations/enhanced-v20/pom.xml
+++ b/operations/enhanced-v20/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-operations</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-enhanced-v20</artifactId>
diff --git a/operations/extensions-v20/pom.xml b/operations/extensions-v20/pom.xml
index 959d94e8ec..8d59b08c4c 100644
--- a/operations/extensions-v20/pom.xml
+++ b/operations/extensions-v20/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-operations</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-extensions-v20</artifactId>
diff --git a/operations/pom.xml b/operations/pom.xml
index 783a2e4467..92465ea7a2 100644
--- a/operations/pom.xml
+++ b/operations/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-parent</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-operations</artifactId>
     <packaging>pom</packaging>
diff --git a/operations/resultHandling-v20/pom.xml b/operations/resultHandling-v20/pom.xml
index f6d729ba9e..3e9c206211 100644
--- a/operations/resultHandling-v20/pom.xml
+++ b/operations/resultHandling-v20/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-operations</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-resultHandling-v20</artifactId>
diff --git a/operations/transactional-v20/pom.xml b/operations/transactional-v20/pom.xml
index 1348db26be..836097833f 100644
--- a/operations/transactional-v20/pom.xml
+++ b/operations/transactional-v20/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-operations</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-transactional-v20</artifactId>
diff --git a/pom.xml b/pom.xml
index 405dfc2e11..09a4741e73 100644
--- a/pom.xml
+++ b/pom.xml
@@ -9,7 +9,7 @@
     </parent>
     <groupId>org.n52.sensorweb-server.sos</groupId>
     <artifactId>sos-parent</artifactId>
-    <version>5.5.1-SNAPSHOT</version>
+    <version>5.5.1</version>
     <name>52°North Sensor Observation Service</name>
     <description>52°North Sensor Observation Service - Parent POM for defining dependency versions</description>
     <url>https://github.com/52North/SOS</url>
@@ -20,7 +20,7 @@
         <url>https://github.com/52North/SOS</url>
         <connection>scm:git:https://github.com/52North/SOS.git</connection>
         <developerConnection>scm:git:https://github.com/52North/SOS.git</developerConnection>
-        <tag>v5.3.1</tag>
+        <tag>v5.5.1</tag>
     </scm>
 
     <issueManagement>
diff --git a/spring/admin-controller/pom.xml b/spring/admin-controller/pom.xml
index 1468a2b6cc..40b1d4abb6 100644
--- a/spring/admin-controller/pom.xml
+++ b/spring/admin-controller/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-spring</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-admin-controller</artifactId>
     <name>52°North SOS - Web Admin Controller</name>
diff --git a/spring/client-controller/pom.xml b/spring/client-controller/pom.xml
index 93d241ec7c..96759493a6 100644
--- a/spring/client-controller/pom.xml
+++ b/spring/client-controller/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-spring</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-client-controller</artifactId>
     <name>52°North SOS - Web Client Controller</name>
diff --git a/spring/common-controller/pom.xml b/spring/common-controller/pom.xml
index 5ed36c2723..4bdaec41b9 100644
--- a/spring/common-controller/pom.xml
+++ b/spring/common-controller/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-spring</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-common-controller</artifactId>
     <name>52°North SOS - Web Common Controller</name>
diff --git a/spring/install-controller/pom.xml b/spring/install-controller/pom.xml
index eab6fdb87b..20c7729f14 100644
--- a/spring/install-controller/pom.xml
+++ b/spring/install-controller/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-spring</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-install-controller</artifactId>
     <name>52°North SOS - Web Install Controller</name>
diff --git a/spring/pom.xml b/spring/pom.xml
index 5d3aa58308..9a56d74dba 100644
--- a/spring/pom.xml
+++ b/spring/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <artifactId>sos-parent</artifactId>
         <groupId>org.n52.sensorweb-server.sos</groupId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-spring</artifactId>
     <packaging>pom</packaging>
diff --git a/spring/views/pom.xml b/spring/views/pom.xml
index 670d828b85..3f83637929 100644
--- a/spring/views/pom.xml
+++ b/spring/views/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.n52.sensorweb-server.sos</groupId>
         <artifactId>sos-spring</artifactId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <artifactId>sos-views</artifactId>
     <name>52°North SOS - Web Views</name>
diff --git a/webapp/pom.xml b/webapp/pom.xml
index 667ba3aa2f..826c7f1604 100644
--- a/webapp/pom.xml
+++ b/webapp/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <artifactId>sos-parent</artifactId>
         <groupId>org.n52.sensorweb-server.sos</groupId>
-        <version>5.5.1-SNAPSHOT</version>
+        <version>5.5.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>sos-webapp</artifactId>