diff --git a/build.gradle b/build.gradle
index 531c506..702ed44 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,8 +1,8 @@
 plugins {
     id "de.marcphilipp.nexus-publish" version "0.4.0"
     id "io.codearte.nexus-staging" version "0.21.1"
-    id "org.xbib.gradle.plugin.asciidoctor" version "1.5.6.0.1"
-    id "com.github.spotbugs" version "4.2.4"
+    id "org.xbib.gradle.plugin.asciidoctor" version "2.5.2.0"
+    id "com.github.spotbugs" version "5.0.3"
     id "pmd"
     id "checkstyle"
 }
diff --git a/gradle.properties b/gradle.properties
index e084716..c75c138 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -2,7 +2,8 @@ group = org.xbib
 name = content
 version = 4.0.0
 
-gradle.wrapper.version = 6.6.1
+org.gradle.warning.mode = ALL
+gradle.wrapper.version = 7.3.2
 xbib.net.version = 2.1.1
 xbib-datastructures.version = 1.0.0
 jackson.version = 2.12.3
diff --git a/gradle/config/checkstyle/checkstyle.xml b/gradle/config/checkstyle/checkstyle.xml
index 2321bcb..fa4396b 100644
--- a/gradle/config/checkstyle/checkstyle.xml
+++ b/gradle/config/checkstyle/checkstyle.xml
@@ -38,22 +38,6 @@ page at http://checkstyle.sourceforge.net/config.html -->
           Only allows a package-info.java, not package.html. -->
     </module>
 
-    <module name="LineLength">
-        <!-- Checks if a line is too long. -->
-        <property name="max" value="${com.puppycrawl.tools.checkstyle.checks.sizes.LineLength.max}" default="128"/>
-        <property name="severity" value="error"/>
-
-        <!--
-          The default ignore pattern exempts the following elements:
-            - import statements
-            - long URLs inside comments
-        -->
-
-        <property name="ignorePattern"
-                  value="${com.puppycrawl.tools.checkstyle.checks.sizes.LineLength.ignorePattern}"
-                  default="^(package .*;\s*)|(import .*;\s*)|( *(\*|//).*https?://.*)$"/>
-    </module>
-
     <!-- All Java AST specific tests live under TreeWalker module. -->
     <module name="TreeWalker">
 
@@ -87,7 +71,7 @@ page at http://checkstyle.sourceforge.net/config.html -->
         <!-- Checks for Javadoc comments.                     -->
         <!-- See http://checkstyle.sf.net/config_javadoc.html -->
         <module name="JavadocMethod">
-            <property name="scope" value="protected"/>
+            <property name="accessModifiers" value="protected"/>
             <property name="severity" value="warning"/>
             <property name="allowMissingParamTags" value="true"/>
             <property name="allowMissingReturnTag" value="true"/>
@@ -316,5 +300,21 @@ page at http://checkstyle.sourceforge.net/config.html -->
         </module>
 
     </module>
+
+    <module name="LineLength">
+        <!-- Checks if a line is too long. -->
+        <property name="max" value="${com.puppycrawl.tools.checkstyle.checks.sizes.LineLength.max}" default="128"/>
+        <property name="severity" value="error"/>
+
+        <!--
+          The default ignore pattern exempts the following elements:
+            - import statements
+            - long URLs inside comments
+        -->
+
+        <property name="ignorePattern"
+                  value="${com.puppycrawl.tools.checkstyle.checks.sizes.LineLength.ignorePattern}"
+                  default="^(package .*;\s*)|(import .*;\s*)|( *(\*|//).*https?://.*)$"/>
+    </module>
 </module>
 
diff --git a/gradle/quality/checkstyle.gradle b/gradle/quality/checkstyle.gradle
index e42e014..3e046e4 100644
--- a/gradle/quality/checkstyle.gradle
+++ b/gradle/quality/checkstyle.gradle
@@ -1,27 +1,17 @@
 apply plugin: 'checkstyle'
 
 checkstyle {
-    toolVersion '8.33'
+    toolVersion '9.2.1'
     showViolations = true
     ignoreFailures = true
     configFile rootProject.file("gradle/config/checkstyle/checkstyle.xml")
 }
 
-checkstyleMain {
-    exclude "**/module-info.java"
-    logging.setLevel(LogLevel.LIFECYCLE)
-    source ='src/main/java'
-}
-
-checkstyleTest {
-    exclude "**/module-info.java"
-    logging.setLevel(LogLevel.LIFECYCLE)
-    source ='src/test/java'
-}
-
 tasks.withType(Checkstyle) {
+    exclude "**/module-info.java"
+    logging.setLevel(LogLevel.LIFECYCLE)
     reports {
-        xml.enabled false
-        html.enabled true
+        xml.required = false
+        html.required = true
     }
 }
\ No newline at end of file
diff --git a/gradle/quality/pmd.gradle b/gradle/quality/pmd.gradle
index d20868b..f80d0b0 100644
--- a/gradle/quality/pmd.gradle
+++ b/gradle/quality/pmd.gradle
@@ -3,7 +3,6 @@ apply plugin: 'pmd'
 pmd {
     ignoreFailures = true
     consoleOutput = false
-    toolVersion = "6.24.0"
-    rulePriority = 5
+    toolVersion = "6.41.0"
     ruleSetFiles = rootProject.files('gradle/config/pmd/category/java/bestpractices.xml')
 }
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 33682bb..ac0b842 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.6.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.2-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists