diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7af634096..7834987f1 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         group: [ cfi-tests, downstream-ontology, downstream-security-demo, downstream-universe ]
-        jdk: [ 8, 11, 17 ]
+        jdk: [ 8, 11, 17, 21]
     runs-on: ubuntu-latest
     steps:
       - name: Install dependencies
@@ -52,7 +52,7 @@ jobs:
           python3 -m pip install --upgrade pip
           if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
       - name: Spotless Check
-        if: matrix.jdk == 11 || matrix.jdk == 17
+        if: matrix.jdk != 8
         run: ./gradlew spotlessCheck
       - name: Build
         run: |
diff --git a/src/checkers/inference/solver/backend/logiql/LogicBloxRunner.java b/src/checkers/inference/solver/backend/logiql/LogicBloxRunner.java
index 98026832b..ed979b4fe 100644
--- a/src/checkers/inference/solver/backend/logiql/LogicBloxRunner.java
+++ b/src/checkers/inference/solver/backend/logiql/LogicBloxRunner.java
@@ -56,7 +56,8 @@ public void runLogicBlox() {
      */
     private void getOutPut_Error(String command, final int i)
             throws IOException, InterruptedException {
-        final Process p = Runtime.getRuntime().exec(command);
+        ProcessBuilder processBuilder = new ProcessBuilder(command.split(" "));
+        final Process p = processBuilder.start();
         Thread getOutPut =
                 new Thread() {
                     @Override
diff --git a/testdata/ostrusted-not-inferrable-test/RuntimeExec.java b/testdata/ostrusted-not-inferrable-test/RuntimeExec.java
index b530ab271..f682adbee 100644
--- a/testdata/ostrusted-not-inferrable-test/RuntimeExec.java
+++ b/testdata/ostrusted-not-inferrable-test/RuntimeExec.java
@@ -3,7 +3,7 @@
 
 import java.io.File;
 import java.io.IOException;
-
+@SuppressWarnings("deprecation")
 class RuntimeExec {
 
     @OsTrusted String trustedField = "";