diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c8da4486..eaa9f00d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
   build:
     strategy:
       matrix:
-        java: [ '8', '17' ]
+        java: [ '11', '17' ]
         os: [ 'ubuntu-latest', 'windows-latest' ]
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/pom.xml b/pom.xml
index 84d1afc0..40f5a98f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -244,32 +244,19 @@ under the License.
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-javadoc-plugin</artifactId>
-                    <version>3.0.1</version>
+                    <version>3.6.0</version>
                     <configuration>
-                        <source>1.8</source>
+                        <source>11</source>
                         <detectJavaApiLink>false</detectJavaApiLink>
                         <subpackages>org.scoverage.plugin</subpackages>
                         <links>
-                            <link>https://docs.oracle.com/javase/8/docs/api/</link>
+                            <link>https://docs.oracle.com/javase/11/docs/api/</link>
                             <link>https://maven.apache.org/ref/${maven.version}/maven-plugin-api/apidocs/</link>
                             <link>https://maven.apache.org/ref/${maven.version}/maven-project/apidocs/</link>
                             <link>https://maven.apache.org/ref/${maven.version}/maven-reporting/maven-reporting-api/apidocs/</link>
                             <link>https://maven.apache.org/doxia/doxia/apidocs/</link>
                         </links>
                         <notimestamp>true</notimestamp>
-                        <!-- graphviz -->
-                        <doclet>org.umlgraph.doclet.UmlGraphDoc</doclet>
-                        <docletArtifact>
-                            <groupId>org.umlgraph</groupId>
-                            <artifactId>umlgraph</artifactId>
-                            <version>5.6.6</version>
-                        </docletArtifact>
-                        <additionalOptions>
-                            -inferrel -inferdep -quiet -hide (java|javax)\..*
-                            -collpackages java\.util\..* -qualify
-                            -postfixpackage -nodefontsize 9
-                            -nodefontpackagesize 7
-                        </additionalOptions>
                     </configuration>
                 </plugin>