diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 5e4a3c56b..ccd88b9c6 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -60,7 +60,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-latest, windows-latest ]
-        java: [ '8', '11', '17', '21' ]
+        java: [ '8', '11', '17' ]
     steps:
       - uses: actions/checkout@v4
 
@@ -70,7 +70,7 @@ jobs:
           distribution: temurin
           java-version: |
             ${{ matrix.java }} 
-            21
+            17
 
       - uses: actions/cache@v4
         with:
diff --git a/pom.xml b/pom.xml
index 90ab77bdd..d44af1d38 100644
--- a/pom.xml
+++ b/pom.xml
@@ -79,7 +79,7 @@
     </scm>
 
     <properties>
-        <minimalJavaBuildVersion>21</minimalJavaBuildVersion>
+        <minimalJavaBuildVersion>17</minimalJavaBuildVersion>
         <jdkToolchainVersion>[${minimalJavaBuildVersion},)</jdkToolchainVersion>
         <minimalMavenBuildVersion>3.9.8</minimalMavenBuildVersion>