diff --git a/README.md b/README.md
index b5a5896d8..c21b35d49 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ Add the following dependency to your pom.xml:
         <dependency>
             <groupId>de.hs-heilbronn.mi</groupId>
             <artifactId>crawler4j-with-sleepycat</artifactId>
-            <version>4.8.3</version>
+            <version>4.9.0</version>
             <type>pom</type>
         </dependency>    
 ```
diff --git a/crawler4j-boms/crawler4j-with-hsqldb/pom.xml b/crawler4j-boms/crawler4j-with-hsqldb/pom.xml
index 5e9a1c55a..fe4815864 100644
--- a/crawler4j-boms/crawler4j-with-hsqldb/pom.xml
+++ b/crawler4j-boms/crawler4j-with-hsqldb/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>crawler4j-boms</artifactId>
         <groupId>de.hs-heilbronn.mi</groupId>
-        <version>4.9.0-SNAPSHOT</version>
+        <version>4.9.0</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/crawler4j-boms/crawler4j-with-sleepycat/pom.xml b/crawler4j-boms/crawler4j-with-sleepycat/pom.xml
index c6f2130a8..fa796f0d1 100644
--- a/crawler4j-boms/crawler4j-with-sleepycat/pom.xml
+++ b/crawler4j-boms/crawler4j-with-sleepycat/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>crawler4j-boms</artifactId>
         <groupId>de.hs-heilbronn.mi</groupId>
-        <version>4.9.0-SNAPSHOT</version>
+        <version>4.9.0</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <packaging>pom</packaging>
diff --git a/crawler4j-boms/crawler4j-with-urlfrontier/pom.xml b/crawler4j-boms/crawler4j-with-urlfrontier/pom.xml
index 64905c2e0..a3a0d6617 100644
--- a/crawler4j-boms/crawler4j-with-urlfrontier/pom.xml
+++ b/crawler4j-boms/crawler4j-with-urlfrontier/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>crawler4j-boms</artifactId>
         <groupId>de.hs-heilbronn.mi</groupId>
-        <version>4.9.0-SNAPSHOT</version>
+        <version>4.9.0</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <packaging>pom</packaging>
diff --git a/crawler4j-boms/pom.xml b/crawler4j-boms/pom.xml
index f5cddbe5b..15e57a2e4 100644
--- a/crawler4j-boms/pom.xml
+++ b/crawler4j-boms/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>crawler4j-parent</artifactId>
         <groupId>de.hs-heilbronn.mi</groupId>
-        <version>4.9.0-SNAPSHOT</version>
+        <version>4.9.0</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/crawler4j-commons/pom.xml b/crawler4j-commons/pom.xml
index d8991fb9f..636591d2b 100644
--- a/crawler4j-commons/pom.xml
+++ b/crawler4j-commons/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>crawler4j-parent</artifactId>
         <groupId>de.hs-heilbronn.mi</groupId>
-        <version>4.9.0-SNAPSHOT</version>
+        <version>4.9.0</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/crawler4j-core/pom.xml b/crawler4j-core/pom.xml
index ff71fd7b9..27dff5e78 100644
--- a/crawler4j-core/pom.xml
+++ b/crawler4j-core/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>crawler4j-parent</artifactId>
         <groupId>de.hs-heilbronn.mi</groupId>
-        <version>4.9.0-SNAPSHOT</version>
+        <version>4.9.0</version>
     </parent>
 
     <artifactId>crawler4j-core</artifactId>
diff --git a/crawler4j-examples/crawler4j-examples-base/pom.xml b/crawler4j-examples/crawler4j-examples-base/pom.xml
index 144cd4e93..09e15960a 100644
--- a/crawler4j-examples/crawler4j-examples-base/pom.xml
+++ b/crawler4j-examples/crawler4j-examples-base/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <artifactId>crawler4j-examples</artifactId>
         <groupId>de.hs-heilbronn.mi</groupId>
-        <version>4.9.0-SNAPSHOT</version>
+        <version>4.9.0</version>
     </parent>
     <artifactId>crawler4j-examples-base</artifactId>
     <name>${project.groupId}:${project.artifactId}</name>
diff --git a/crawler4j-examples/crawler4j-examples-postgres/pom.xml b/crawler4j-examples/crawler4j-examples-postgres/pom.xml
index 8cc55cf02..f645a61ca 100644
--- a/crawler4j-examples/crawler4j-examples-postgres/pom.xml
+++ b/crawler4j-examples/crawler4j-examples-postgres/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <artifactId>crawler4j-examples</artifactId>
         <groupId>de.hs-heilbronn.mi</groupId>
-        <version>4.9.0-SNAPSHOT</version>
+        <version>4.9.0</version>
     </parent>
     <name>${project.groupId}:${project.artifactId}</name>
     <artifactId>crawler4j-examples-postgres</artifactId>
diff --git a/crawler4j-examples/pom.xml b/crawler4j-examples/pom.xml
index f6078fded..02225ba4e 100644
--- a/crawler4j-examples/pom.xml
+++ b/crawler4j-examples/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <artifactId>crawler4j-parent</artifactId>
         <groupId>de.hs-heilbronn.mi</groupId>
-        <version>4.9.0-SNAPSHOT</version>
+        <version>4.9.0</version>
     </parent>
 
     <name>${project.groupId}:${project.artifactId}</name>
diff --git a/crawler4j-frontier/crawler4j-frontier-hsqldb/pom.xml b/crawler4j-frontier/crawler4j-frontier-hsqldb/pom.xml
index b4f7e45f6..7d7b387a3 100644
--- a/crawler4j-frontier/crawler4j-frontier-hsqldb/pom.xml
+++ b/crawler4j-frontier/crawler4j-frontier-hsqldb/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>crawler4j-frontier</artifactId>
         <groupId>de.hs-heilbronn.mi</groupId>
-        <version>4.9.0-SNAPSHOT</version>
+        <version>4.9.0</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/crawler4j-frontier/crawler4j-frontier-sleepycat/pom.xml b/crawler4j-frontier/crawler4j-frontier-sleepycat/pom.xml
index 815c6899b..ad19540f7 100644
--- a/crawler4j-frontier/crawler4j-frontier-sleepycat/pom.xml
+++ b/crawler4j-frontier/crawler4j-frontier-sleepycat/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>crawler4j-frontier</artifactId>
         <groupId>de.hs-heilbronn.mi</groupId>
-        <version>4.9.0-SNAPSHOT</version>
+        <version>4.9.0</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/crawler4j-frontier/crawler4j-frontier-urlfrontier/pom.xml b/crawler4j-frontier/crawler4j-frontier-urlfrontier/pom.xml
index 400d9e503..f1bba485f 100644
--- a/crawler4j-frontier/crawler4j-frontier-urlfrontier/pom.xml
+++ b/crawler4j-frontier/crawler4j-frontier-urlfrontier/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>crawler4j-frontier</artifactId>
         <groupId>de.hs-heilbronn.mi</groupId>
-        <version>4.9.0-SNAPSHOT</version>
+        <version>4.9.0</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/crawler4j-frontier/pom.xml b/crawler4j-frontier/pom.xml
index e90ea1899..6acdddc0e 100644
--- a/crawler4j-frontier/pom.xml
+++ b/crawler4j-frontier/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>crawler4j-parent</artifactId>
         <groupId>de.hs-heilbronn.mi</groupId>
-        <version>4.9.0-SNAPSHOT</version>
+        <version>4.9.0</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/pom.xml b/pom.xml
index 6a4930f47..24d5a5fea 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
     <groupId>de.hs-heilbronn.mi</groupId>
     <artifactId>crawler4j-parent</artifactId>
     <packaging>pom</packaging>
-    <version>4.9.0-SNAPSHOT</version>
+    <version>4.9.0</version>
     <name>${project.groupId}:${project.artifactId}</name>
 
     <description>Open Source Web Crawler for Java</description>
@@ -132,7 +132,7 @@
         <maven.versions.version>2.10.0</maven.versions.version>
         <maven.forbiddenapis.version>3.3</maven.forbiddenapis.version>
         <maven.enforcer.version>3.0.0</maven.enforcer.version>
-        <maven.surefire.version>3.0.0-M6</maven.surefire.version>
+        <maven.surefire.version>2.22.2</maven.surefire.version>
     </properties>
 
     <profiles>