diff --git a/snet/build.gradle b/snet/build.gradle
index 36660f28e..5ed9c6d22 100644
--- a/snet/build.gradle
+++ b/snet/build.gradle
@@ -8,7 +8,7 @@ android {
         applicationId "com.topjohnwu.snet"
         minSdkVersion 14
         targetSdkVersion rootProject.ext.compileSdkVersion
-        versionCode 11
+        versionCode 12
         versionName "snet"
     }
 
@@ -23,5 +23,5 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation 'com.google.android.gms:play-services-safetynet:15.0.1'
+    implementation 'com.google.android.gms:play-services-safetynet:16.0.0'
 }
diff --git a/snet/proguard-rules.pro b/snet/proguard-rules.pro
index 290952c23..83a35f656 100644
--- a/snet/proguard-rules.pro
+++ b/snet/proguard-rules.pro
@@ -21,3 +21,6 @@
 #-renamesourcefileattribute SourceFile
 
 -keep class com.topjohnwu.snet.Snet { *; }
+
+-repackageclasses ''
+-allowaccessmodification
diff --git a/snet/src/main/java/com/topjohnwu/snet/SafetyNetHelper.java b/snet/src/main/java/com/topjohnwu/snet/SafetyNetHelper.java
index 3a0ac0b7c..34015a6bb 100644
--- a/snet/src/main/java/com/topjohnwu/snet/SafetyNetHelper.java
+++ b/snet/src/main/java/com/topjohnwu/snet/SafetyNetHelper.java
@@ -5,7 +5,6 @@ import android.app.AlertDialog;
 import android.app.Dialog;
 import android.content.Context;
 import android.content.Intent;
-import androidx.annotation.NonNull;
 import android.util.Base64;
 import android.util.Log;
 
@@ -27,6 +26,8 @@ import java.lang.reflect.InvocationHandler;
 import java.lang.reflect.Method;
 import java.security.SecureRandom;
 
+import androidx.annotation.NonNull;
+
 public class SafetyNetHelper implements InvocationHandler,
         OnSuccessListener<SafetyNetApi.AttestationResponse>, OnFailureListener {
 
@@ -39,9 +40,6 @@ public class SafetyNetHelper implements InvocationHandler,
     private static final SecureRandom RANDOM = new SecureRandom();
     private static final String TAG = "SNET";
 
-    /* Insert the magic API key here :) */
-    private static final String API_KEY = "";
-
     private final Activity mActivity;
     private final Object callback;
 
@@ -57,6 +55,11 @@ public class SafetyNetHelper implements InvocationHandler,
         } catch (Exception ignored) {}
     }
 
+    /* Return magic API key here :) */
+    private String getApiKey() {
+        return "";
+    }
+
     /* Override ISafetyNetHelper.getVersion */
     private int getVersion() {
         return BuildConfig.VERSION_CODE;
@@ -76,7 +79,7 @@ public class SafetyNetHelper implements InvocationHandler,
         RANDOM.nextBytes(nonce);
 
         SafetyNetClient client = SafetyNet.getClient(mActivity.getBaseContext());
-        client.attest(nonce, API_KEY).addOnSuccessListener(this).addOnFailureListener(this);
+        client.attest(nonce, getApiKey()).addOnSuccessListener(this).addOnFailureListener(this);
     }
 
     private Dialog getErrorDialog(int errorCode, int requestCode) {