diff --git a/net.sf.eclipsecs.checkstyle/.classpath b/net.sf.eclipsecs.checkstyle/.classpath
index c04598ece..bcfbc701e 100644
--- a/net.sf.eclipsecs.checkstyle/.classpath
+++ b/net.sf.eclipsecs.checkstyle/.classpath
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
-	<classpathentry exported="true" kind="lib" path="checkstyle-11.1.0-all.jar" sourcepath="checkstyle-checkstyle-11.1.0.zip"/>
+	<classpathentry exported="true" kind="lib" path="checkstyle-12.0.0-all.jar" sourcepath="checkstyle-checkstyle-12.0.0.zip"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-17">
 		<attributes>
 			<attribute name="maven.pomderived" value="true"/>
diff --git a/net.sf.eclipsecs.checkstyle/META-INF/MANIFEST.MF b/net.sf.eclipsecs.checkstyle/META-INF/MANIFEST.MF
index 58c4f8942..b04f90662 100644
--- a/net.sf.eclipsecs.checkstyle/META-INF/MANIFEST.MF
+++ b/net.sf.eclipsecs.checkstyle/META-INF/MANIFEST.MF
@@ -40,5 +40,5 @@ Export-Package: .,
  org.codehaus.plexus.util
 Require-Bundle: org.eclipse.core.runtime
 Bundle-ClassPath: .,
- checkstyle-11.1.0-all.jar
+ checkstyle-12.0.0-all.jar
 Automatic-Module-Name: net.sf.eclipsecs.checkstyle
diff --git a/net.sf.eclipsecs.checkstyle/build.properties b/net.sf.eclipsecs.checkstyle/build.properties
index 08364f935..1975901d9 100644
--- a/net.sf.eclipsecs.checkstyle/build.properties
+++ b/net.sf.eclipsecs.checkstyle/build.properties
@@ -1,7 +1,7 @@
 bin.includes = META-INF/,\
                .,\
                license/,\
-               checkstyle-11.1.0-all.jar,\
+               checkstyle-12.0.0-all.jar,\
                OSGI-INF/
 jars.compile.order = .
 source.. = metadata/
diff --git a/net.sf.eclipsecs.checkstyle/checkstyle-11.1.0-all.jar b/net.sf.eclipsecs.checkstyle/checkstyle-12.0.0-all.jar
similarity index 93%
rename from net.sf.eclipsecs.checkstyle/checkstyle-11.1.0-all.jar
rename to net.sf.eclipsecs.checkstyle/checkstyle-12.0.0-all.jar
index 3d24d8192..9d6105727 100644
Binary files a/net.sf.eclipsecs.checkstyle/checkstyle-11.1.0-all.jar and b/net.sf.eclipsecs.checkstyle/checkstyle-12.0.0-all.jar differ
diff --git a/net.sf.eclipsecs.checkstyle/pom.xml b/net.sf.eclipsecs.checkstyle/pom.xml
index 57a1164ec..12f1829c6 100644
--- a/net.sf.eclipsecs.checkstyle/pom.xml
+++ b/net.sf.eclipsecs.checkstyle/pom.xml
@@ -11,7 +11,7 @@
     <name>Checkstyle Core Library Plugin</name>
 
     <properties>
-        <checkstyle.version>11.1.0</checkstyle.version>
+        <checkstyle.version>12.0.0</checkstyle.version>
     </properties>
     <build>
         <plugins>
diff --git a/upgrade-version.build.xml b/upgrade-version.build.xml
index d4a28dad9..aa2ac4741 100644
--- a/upgrade-version.build.xml
+++ b/upgrade-version.build.xml
@@ -18,8 +18,8 @@ Apply all necessary manual code changes now.
 	<description>upgrade all version numbers</description>
 
 	<target name="upgrade-version" description="upgrade version numbers and dependent files">
-		<property name="fromVersion" value="11.0.1"/>
-		<property name="toVersion" value="11.1.0"/>
+		<property name="fromVersion" value="11.1.0"/>
+		<property name="toVersion" value="12.0.0"/>
 
 		<!-- delete all outdated files, independent of their current version -->
 		<delete>