diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 9756e23..b50e32f 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -34,7 +34,7 @@ android {
       signingConfig = signingConfigs.getByName("release")
       isShrinkResources = true
       isMinifyEnabled = true
-      proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"))
+      proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
     }
   }
   buildFeatures {
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
new file mode 100644
index 0000000..1daaf4c
--- /dev/null
+++ b/app/proguard-rules.pro
@@ -0,0 +1,17 @@
+# Remove Kotlin assertions
+# https://www.guardsquare.com/blog/eliminating-data-leaks-caused-by-kotlin-assertions
+-assumenosideeffects class kotlin.jvm.internal.Intrinsics {
+	public static void checkNotNull(...);
+	public static void checkExpressionValueIsNotNull(...);
+	public static void checkNotNullExpressionValue(...);
+	public static void checkParameterIsNotNull(...);
+	public static void checkNotNullParameter(...);
+	public static void checkReturnedValueIsNotNull(...);
+	public static void checkFieldIsNotNull(...);
+	public static void throwUninitializedPropertyAccessException(...);
+	public static void throwNpe(...);
+	public static void throwJavaNpe(...);
+	public static void throwAssert(...);
+	public static void throwIllegalArgument(...);
+	public static void throwIllegalState(...);
+}
\ No newline at end of file