diff --git a/adapters/brics/pom.xml b/adapters/brics/pom.xml
index 26c59efb8e..0a558ad2c6 100644
--- a/adapters/brics/pom.xml
+++ b/adapters/brics/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-adapters-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/adapters/pom.xml b/adapters/pom.xml
index cd59367519..02069657a5 100644
--- a/adapters/pom.xml
+++ b/adapters/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-build-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../build-parent/pom.xml</relativePath>
     </parent>
 
diff --git a/api/pom.xml b/api/pom.xml
index f25d58725a..47f9dc0818 100644
--- a/api/pom.xml
+++ b/api/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-build-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../build-parent/pom.xml</relativePath>
     </parent>
 
diff --git a/archetypes/basic/pom.xml b/archetypes/basic/pom.xml
index 34d19d35cc..408347a721 100644
--- a/archetypes/basic/pom.xml
+++ b/archetypes/basic/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib.archetypes</groupId>
         <artifactId>automata-archetypes-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/archetypes/complete/pom.xml b/archetypes/complete/pom.xml
index ebe772844e..5a59b6c42c 100644
--- a/archetypes/complete/pom.xml
+++ b/archetypes/complete/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib.archetypes</groupId>
         <artifactId>automata-archetypes-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/archetypes/pom.xml b/archetypes/pom.xml
index eafd4af921..b80d650527 100644
--- a/archetypes/pom.xml
+++ b/archetypes/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-build-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../build-parent/pom.xml</relativePath>
     </parent>
 
diff --git a/build-parent/pom.xml b/build-parent/pom.xml
index 3e781ea553..6758cf04cb 100644
--- a/build-parent/pom.xml
+++ b/build-parent/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/build-tools/pom.xml b/build-tools/pom.xml
index 50aa4f9734..dfbf83b683 100644
--- a/build-tools/pom.xml
+++ b/build-tools/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/commons/pom.xml b/commons/pom.xml
index ce48377dd9..0ccff8a26b 100644
--- a/commons/pom.xml
+++ b/commons/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-build-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../build-parent/pom.xml</relativePath>
     </parent>
 
diff --git a/commons/smartcollections/pom.xml b/commons/smartcollections/pom.xml
index d5ebf5f255..5917f688ac 100644
--- a/commons/smartcollections/pom.xml
+++ b/commons/smartcollections/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-commons-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/commons/util/pom.xml b/commons/util/pom.xml
index 2092cf4cc8..9b7814572f 100644
--- a/commons/util/pom.xml
+++ b/commons/util/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-commons-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/core/pom.xml b/core/pom.xml
index 721903e874..b3ada8eb2d 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-build-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../build-parent/pom.xml</relativePath>
     </parent>
 
diff --git a/distribution/pom.xml b/distribution/pom.xml
index edb9f1c4f3..665bd1b1e4 100644
--- a/distribution/pom.xml
+++ b/distribution/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-build-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../build-parent/pom.xml</relativePath>
     </parent>
 
diff --git a/examples/pom.xml b/examples/pom.xml
index a425e7ae13..808ab6dbd1 100644
--- a/examples/pom.xml
+++ b/examples/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-build-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../build-parent/pom.xml</relativePath>
     </parent>
 
diff --git a/incremental/pom.xml b/incremental/pom.xml
index 3863b14eba..1391e6c216 100644
--- a/incremental/pom.xml
+++ b/incremental/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-build-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../build-parent/pom.xml</relativePath>
     </parent>
 
diff --git a/modelchecking/ltsmin/pom.xml b/modelchecking/ltsmin/pom.xml
index 6033c221ec..6717f21fa2 100644
--- a/modelchecking/ltsmin/pom.xml
+++ b/modelchecking/ltsmin/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-modelchecking-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/modelchecking/pom.xml b/modelchecking/pom.xml
index 4873a30fb9..b161618f07 100644
--- a/modelchecking/pom.xml
+++ b/modelchecking/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-build-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../build-parent/pom.xml</relativePath>
     </parent>
 
diff --git a/pom.xml b/pom.xml
index b6f63814b9..d6caa7daef 100644
--- a/pom.xml
+++ b/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <!-- ================================= PROJECT INFO ============================== -->
     <groupId>net.automatalib</groupId>
     <artifactId>automata-parent</artifactId>
-    <version>0.9.0-SNAPSHOT</version>
+    <version>0.9.0</version>
     <packaging>pom</packaging>
 
     <name>AutomataLib</name>
@@ -127,7 +127,7 @@ limitations under the License.
         <connection>scm:git:git@github.com:learnlib/automatalib.git</connection>
         <developerConnection>scm:git:git@github.com:learnlib/automatalib.git</developerConnection>
         <url>https://github.com/learnlib/automatalib/tree/develop</url>
-        <tag>HEAD</tag>
+        <tag>automatalib-0.9.0</tag>
     </scm>
     <issueManagement>
         <url>https://github.com/learnlib/automatalib/issues</url>
diff --git a/serialization/aut/pom.xml b/serialization/aut/pom.xml
index af4425f09c..00387de31e 100644
--- a/serialization/aut/pom.xml
+++ b/serialization/aut/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-serialization-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/serialization/core/pom.xml b/serialization/core/pom.xml
index f48a9f602f..da4d43122a 100644
--- a/serialization/core/pom.xml
+++ b/serialization/core/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-serialization-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/serialization/dot/pom.xml b/serialization/dot/pom.xml
index 8e94536238..e1be2fc4dc 100644
--- a/serialization/dot/pom.xml
+++ b/serialization/dot/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-serialization-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/serialization/etf/pom.xml b/serialization/etf/pom.xml
index d224b6cef2..ae752eb5ab 100644
--- a/serialization/etf/pom.xml
+++ b/serialization/etf/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-serialization-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/serialization/fsm/pom.xml b/serialization/fsm/pom.xml
index 56b1d09ee1..5e9b4722b8 100644
--- a/serialization/fsm/pom.xml
+++ b/serialization/fsm/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-serialization-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/serialization/learnlibv2/pom.xml b/serialization/learnlibv2/pom.xml
index 88b0f09c10..150d0de8e0 100644
--- a/serialization/learnlibv2/pom.xml
+++ b/serialization/learnlibv2/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-serialization-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/serialization/pom.xml b/serialization/pom.xml
index f20a45bcaf..a38a8a51a0 100644
--- a/serialization/pom.xml
+++ b/serialization/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-build-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../build-parent/pom.xml</relativePath>
     </parent>
 
diff --git a/serialization/saf/pom.xml b/serialization/saf/pom.xml
index 11c36b8867..c26fe4febb 100644
--- a/serialization/saf/pom.xml
+++ b/serialization/saf/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-serialization-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/serialization/taf/pom.xml b/serialization/taf/pom.xml
index ecbbf2c226..36ace851e2 100644
--- a/serialization/taf/pom.xml
+++ b/serialization/taf/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-serialization-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/util/pom.xml b/util/pom.xml
index 88f381a6a1..75892f2ac9 100644
--- a/util/pom.xml
+++ b/util/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-build-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../build-parent/pom.xml</relativePath>
     </parent>
 
diff --git a/visualization/dot-visualizer/pom.xml b/visualization/dot-visualizer/pom.xml
index 1d7a9df2c0..7dcc81dadc 100644
--- a/visualization/dot-visualizer/pom.xml
+++ b/visualization/dot-visualizer/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-visualization-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/visualization/jung-visualizer/pom.xml b/visualization/jung-visualizer/pom.xml
index a20d2e065b..c8dfbb44fc 100644
--- a/visualization/jung-visualizer/pom.xml
+++ b/visualization/jung-visualizer/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-visualization-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/visualization/pom.xml b/visualization/pom.xml
index 888d3b4f19..e3993f2573 100644
--- a/visualization/pom.xml
+++ b/visualization/pom.xml
@@ -21,7 +21,7 @@ limitations under the License.
     <parent>
         <groupId>net.automatalib</groupId>
         <artifactId>automata-build-parent</artifactId>
-        <version>0.9.0-SNAPSHOT</version>
+        <version>0.9.0</version>
         <relativePath>../build-parent/pom.xml</relativePath>
     </parent>