diff --git a/core/pom.xml b/core/pom.xml
index c333cdd..e283e2e 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -7,7 +7,7 @@
     <parent>
         <groupId>com.github.martinpaljak</groupId>
         <artifactId>apdu4j</artifactId>
-        <version>21.04.13-SNAPSHOT</version>
+        <version>21.05.06</version>
     </parent>
 
     <groupId>com.github.martinpaljak</groupId>
diff --git a/pcsc/pom.xml b/pcsc/pom.xml
index 6fb2101..4a2ad00 100644
--- a/pcsc/pom.xml
+++ b/pcsc/pom.xml
@@ -7,12 +7,12 @@
     <parent>
         <groupId>com.github.martinpaljak</groupId>
         <artifactId>apdu4j</artifactId>
-        <version>21.04.13-SNAPSHOT</version>
+        <version>21.05.06</version>
     </parent>
 
     <groupId>com.github.martinpaljak</groupId>
     <artifactId>apdu4j-pcsc</artifactId>
-    <version>21.04.13-SNAPSHOT</version>
+    <version>21.05.06</version>
 
     <dependencies>
         <!-- Core -->
diff --git a/pom.xml b/pom.xml
index 35e69f1..847907d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -8,7 +8,7 @@
         <version>21.04.02</version>
     </parent>
     <artifactId>apdu4j</artifactId>
-    <version>21.04.13-SNAPSHOT</version>
+    <version>21.05.06</version>
     <packaging>pom</packaging>
     <name>apdu4j</name>
     <url>https://github.com/martinpaljak/apdu4j</url>
diff --git a/tool/pom.xml b/tool/pom.xml
index af67afe..df3f552 100644
--- a/tool/pom.xml
+++ b/tool/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>apdu4j</artifactId>
         <groupId>com.github.martinpaljak</groupId>
-        <version>21.04.13-SNAPSHOT</version>
+        <version>21.05.06</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
@@ -15,7 +15,7 @@
         <dependency>
             <groupId>com.github.martinpaljak</groupId>
             <artifactId>apdu4j-pcsc</artifactId>
-            <version>21.04.13-SNAPSHOT</version>
+            <version>21.05.06</version>
         </dependency>
         <!-- cmdline -->
         <dependency>