diff --git a/demos/Android-Demos/PolarSDK-ECG-HR-Demo/build.gradle b/demos/Android-Demos/PolarSDK-ECG-HR-Demo/build.gradle
index 72e7f1dc..33099a4a 100644
--- a/demos/Android-Demos/PolarSDK-ECG-HR-Demo/build.gradle
+++ b/demos/Android-Demos/PolarSDK-ECG-HR-Demo/build.gradle
@@ -8,7 +8,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.1.3'
+        classpath 'com.android.tools.build:gradle:4.2.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/demos/Android-Demos/PolarSDK-ECG-HR-Demo/gradle/wrapper/gradle-wrapper.properties b/demos/Android-Demos/PolarSDK-ECG-HR-Demo/gradle/wrapper/gradle-wrapper.properties
index 8755f063..c2c6858e 100644
--- a/demos/Android-Demos/PolarSDK-ECG-HR-Demo/gradle/wrapper/gradle-wrapper.properties
+++ b/demos/Android-Demos/PolarSDK-ECG-HR-Demo/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-6.5-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-all.zip