diff --git a/.github/workflows/debug.yml b/.github/workflows/debug.yml
index 1f6febe47..52802e98f 100644
--- a/.github/workflows/debug.yml
+++ b/.github/workflows/debug.yml
@@ -44,10 +44,10 @@ jobs:
         env:
           GIT_ACCESS_TOKEN: ${{ secrets.IOT_GITHUB_ACCESS_TOKEN }}
           DECRYPT_PASSPHRASE: ${{ secrets.GPG_DECRYPT_PASSPHRASE }}
-      - name: set up JDK 17
+      - name: set up JDK 15
         uses: actions/setup-java@v2
         with:
-          java-version: '17'
+          java-version: '15'
           distribution: 'adopt'
       - name: Cache Gradle packages
         uses: actions/cache@v2
diff --git a/.github/workflows/integration.yml b/.github/workflows/integration.yml
index ec4ba24e1..d7a5b4d2a 100644
--- a/.github/workflows/integration.yml
+++ b/.github/workflows/integration.yml
@@ -14,10 +14,10 @@ jobs:
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0
-      - name: set up JDK 17
+      - name: set up JDK 15
         uses: actions/setup-java@v1
         with:
-          java-version: 17
+          java-version: 15
       - name: Integration
         run: |
           git clone https://$GIT_ACCESS_TOKEN@github.com/archurcode/Integrationtesting.git
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 440cc2268..3ffd0c03e 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -32,10 +32,10 @@ jobs:
         env:
           GIT_ACCESS_TOKEN: ${{ secrets.IOT_GITHUB_ACCESS_TOKEN }}
           DECRYPT_PASSPHRASE: ${{ secrets.GPG_DECRYPT_PASSPHRASE }}
-      - name: set up JDK 17
+      - name: set up JDK 15
         uses: actions/setup-java@v2
         with:
-          java-version: '17'
+          java-version: '15'
           distribution: 'adopt'
       - name: Cache Gradle packages
         uses: actions/cache@v2
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index d585e5e88..127e9176a 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip