diff --git a/.github/workflows/ci-build.yml b/.github/workflows/ci-build.yml
index 5ac8d4fe..3ed6ee03 100644
--- a/.github/workflows/ci-build.yml
+++ b/.github/workflows/ci-build.yml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        java: [ '17' ]
+        java: [ '11' ]
         maven: [ '3.8.6' ]
         os: [ 'ubuntu-22.04' ]
     name: Build (Java ${{ matrix.java }}, ${{ matrix.os }})
diff --git a/pom.xml b/pom.xml
index 5fd2a782..3bceec33 100644
--- a/pom.xml
+++ b/pom.xml
@@ -57,7 +57,7 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <oh.java.version>17</oh.java.version>
+    <oh.java.version>11</oh.java.version>
     <maven.compiler.source>${oh.java.version}</maven.compiler.source>
     <maven.compiler.target>${oh.java.version}</maven.compiler.target>
     <maven.compiler.compilerVersion>${oh.java.version}</maven.compiler.compilerVersion>
@@ -449,7 +449,7 @@
         <artifactId>maven-javadoc-plugin</artifactId>
         <version>3.4.1</version>
         <configuration>
-          <source>17</source>
+          <source>11</source>
           <outputDirectory>${project.build.directory}/javadoc</outputDirectory>
           <doclint>all,-missing</doclint>
           <failOnError>true</failOnError>
@@ -478,7 +478,7 @@
             <configuration>
               <rules>
                 <requireJavaVersion>
-                  <version>[17.0,18.0)</version>
+                  <version>[11.0,12.0)</version>
                 </requireJavaVersion>
               </rules>
             </configuration>