diff --git a/.github/actions/preparing/action.yml b/.github/actions/preparing/action.yml
index 73a4997..5a3e8e3 100644
--- a/.github/actions/preparing/action.yml
+++ b/.github/actions/preparing/action.yml
@@ -7,6 +7,17 @@ runs:
       with:
         distribution: 'zulu'
         java-version: '21'
+    - name: Install Bouncy Castle provider for BKS keystore
+      shell: bash
+      run: |
+        sudo apt-get install -y -q libbcprov-java
+        BCPROV=$(find /usr/share/java -name "bcprov-*.jar" | grep -v debian | head -1)
+        sudo cp "$BCPROV" "$JAVA_HOME/lib/bcprov.jar"
+        LAST_PROV=$(grep "^security.provider\." "$JAVA_HOME/conf/security/java.security" \
+          | grep -oP '(?<=security\.provider\.)\d+' | sort -n | tail -1)
+        echo "security.provider.$((LAST_PROV+1))=org.bouncycastle.jce.provider.BouncyCastleProvider" \
+          | sudo tee -a "$JAVA_HOME/conf/security/java.security"
+        echo "[+] Bouncy Castle registered as provider #$((LAST_PROV+1))"
     - name: Start FlareSolverr
       shell: bash
       run: |