diff --git a/acme4j-client/pom.xml b/acme4j-client/pom.xml
index 969dd96b..1158005b 100644
--- a/acme4j-client/pom.xml
+++ b/acme4j-client/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <groupId>org.shredzone.acme4j</groupId>
         <artifactId>acme4j</artifactId>
-        <version>3.3.1-SNAPSHOT</version>
+        <version>3.3.1</version>
     </parent>
 
     <artifactId>acme4j-client</artifactId>
diff --git a/acme4j-example/pom.xml b/acme4j-example/pom.xml
index 14a63493..4c7d814f 100644
--- a/acme4j-example/pom.xml
+++ b/acme4j-example/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <groupId>org.shredzone.acme4j</groupId>
         <artifactId>acme4j</artifactId>
-        <version>3.3.1-SNAPSHOT</version>
+        <version>3.3.1</version>
     </parent>
 
     <artifactId>acme4j-example</artifactId>
diff --git a/acme4j-it/pom.xml b/acme4j-it/pom.xml
index c75ead1a..7f39d3df 100644
--- a/acme4j-it/pom.xml
+++ b/acme4j-it/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <groupId>org.shredzone.acme4j</groupId>
         <artifactId>acme4j</artifactId>
-        <version>3.3.1-SNAPSHOT</version>
+        <version>3.3.1</version>
     </parent>
 
     <artifactId>acme4j-it</artifactId>
diff --git a/acme4j-smime/pom.xml b/acme4j-smime/pom.xml
index b5ed9bec..5911df87 100644
--- a/acme4j-smime/pom.xml
+++ b/acme4j-smime/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <groupId>org.shredzone.acme4j</groupId>
         <artifactId>acme4j</artifactId>
-        <version>3.3.1-SNAPSHOT</version>
+        <version>3.3.1</version>
     </parent>
 
     <artifactId>acme4j-smime</artifactId>
diff --git a/pom.xml b/pom.xml
index 1a90c21d..18aad21e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -19,7 +19,7 @@
 
     <groupId>org.shredzone.acme4j</groupId>
     <artifactId>acme4j</artifactId>
-    <version>3.3.1-SNAPSHOT</version>
+    <version>3.3.1</version>
     <packaging>pom</packaging>
 
     <name>acme4j</name>
@@ -37,7 +37,7 @@
         <url>https://github.com/shred/acme4j/</url>
         <connection>scm:git:git@github.com:shred/acme4j.git</connection>
         <developerConnection>scm:git:git@github.com:shred/acme4j.git</developerConnection>
-      <tag>HEAD</tag>
+      <tag>v3.3.1</tag>
   </scm>
     <issueManagement>
         <system>GitHub</system>