diff --git a/libs/appfunctions/api/current.txt b/libs/appfunctions/api/current.txt
index e9845c1..27817e9 100644
--- a/libs/appfunctions/api/current.txt
+++ b/libs/appfunctions/api/current.txt
@@ -4,7 +4,6 @@
   public final class AppFunctionManager {
     ctor public AppFunctionManager(android.content.Context);
     method public void executeAppFunction(@NonNull com.google.android.appfunctions.sidecar.ExecuteAppFunctionRequest, @NonNull java.util.concurrent.Executor, @NonNull android.os.CancellationSignal, @NonNull java.util.function.Consumer<com.google.android.appfunctions.sidecar.ExecuteAppFunctionResponse>);
-    method @Deprecated public void executeAppFunction(@NonNull com.google.android.appfunctions.sidecar.ExecuteAppFunctionRequest, @NonNull java.util.concurrent.Executor, @NonNull java.util.function.Consumer<com.google.android.appfunctions.sidecar.ExecuteAppFunctionResponse>);
     method public void isAppFunctionEnabled(@NonNull String, @NonNull String, @NonNull java.util.concurrent.Executor, @NonNull android.os.OutcomeReceiver<java.lang.Boolean,java.lang.Exception>);
     method public void setAppFunctionEnabled(@NonNull String, int, @NonNull java.util.concurrent.Executor, @NonNull android.os.OutcomeReceiver<java.lang.Void,java.lang.Exception>);
     field public static final int APP_FUNCTION_STATE_DEFAULT = 0; // 0x0
@@ -15,9 +14,7 @@
   public abstract class AppFunctionService extends android.app.Service {
     ctor public AppFunctionService();
     method @NonNull public final android.os.IBinder onBind(@Nullable android.content.Intent);
-    method @MainThread public void onExecuteFunction(@NonNull com.google.android.appfunctions.sidecar.ExecuteAppFunctionRequest, @NonNull String, @NonNull android.os.CancellationSignal, @NonNull java.util.function.Consumer<com.google.android.appfunctions.sidecar.ExecuteAppFunctionResponse>);
-    method @Deprecated @MainThread public void onExecuteFunction(@NonNull com.google.android.appfunctions.sidecar.ExecuteAppFunctionRequest, @NonNull android.os.CancellationSignal, @NonNull java.util.function.Consumer<com.google.android.appfunctions.sidecar.ExecuteAppFunctionResponse>);
-    method @Deprecated @MainThread public void onExecuteFunction(@NonNull com.google.android.appfunctions.sidecar.ExecuteAppFunctionRequest, @NonNull java.util.function.Consumer<com.google.android.appfunctions.sidecar.ExecuteAppFunctionResponse>);
+    method @MainThread public abstract void onExecuteFunction(@NonNull com.google.android.appfunctions.sidecar.ExecuteAppFunctionRequest, @NonNull String, @NonNull android.os.CancellationSignal, @NonNull java.util.function.Consumer<com.google.android.appfunctions.sidecar.ExecuteAppFunctionResponse>);
     field @NonNull public static final String BIND_APP_FUNCTION_SERVICE = "android.permission.BIND_APP_FUNCTION_SERVICE";
     field @NonNull public static final String SERVICE_INTERFACE = "android.app.appfunctions.AppFunctionService";
   }
diff --git a/libs/appfunctions/java/com/google/android/appfunctions/sidecar/AppFunctionManager.java b/libs/appfunctions/java/com/google/android/appfunctions/sidecar/AppFunctionManager.java
index d660926..43377d8 100644
--- a/libs/appfunctions/java/com/google/android/appfunctions/sidecar/AppFunctionManager.java
+++ b/libs/appfunctions/java/com/google/android/appfunctions/sidecar/AppFunctionManager.java
@@ -126,33 +126,6 @@
     }
 
     /**
-     * Executes the app function.
-     *
-     * <p>Proxies request and response to the underlying {@link
-     * android.app.appfunctions.AppFunctionManager#executeAppFunction}, converting the request and
-     * response in the appropriate type required by the function.
-     *
-     * @deprecated Use {@link #executeAppFunction(ExecuteAppFunctionRequest, Executor,
-     *     CancellationSignal, Consumer)} instead. This method will be removed once usage references
-     *     are updated.
-     */
-    @Deprecated
-    public void executeAppFunction(
-            @NonNull ExecuteAppFunctionRequest sidecarRequest,
-            @NonNull @CallbackExecutor Executor executor,
-            @NonNull Consumer<ExecuteAppFunctionResponse> callback) {
-        Objects.requireNonNull(sidecarRequest);
-        Objects.requireNonNull(executor);
-        Objects.requireNonNull(callback);
-
-        executeAppFunction(
-                sidecarRequest,
-                executor,
-                new CancellationSignal(),
-                callback);
-    }
-
-    /**
      * Returns a boolean through a callback, indicating whether the app function is enabled.
      *
      * <p>* This method can only check app functions owned by the caller, or those where the caller
diff --git a/libs/appfunctions/java/com/google/android/appfunctions/sidecar/AppFunctionService.java b/libs/appfunctions/java/com/google/android/appfunctions/sidecar/AppFunctionService.java
index 2a168e8..0dc87e4 100644
--- a/libs/appfunctions/java/com/google/android/appfunctions/sidecar/AppFunctionService.java
+++ b/libs/appfunctions/java/com/google/android/appfunctions/sidecar/AppFunctionService.java
@@ -119,76 +119,9 @@
      * @param callback A callback to report back the result.
      */
     @MainThread
-    public void onExecuteFunction(
+    public abstract void onExecuteFunction(
             @NonNull ExecuteAppFunctionRequest request,
             @NonNull String callingPackage,
             @NonNull CancellationSignal cancellationSignal,
-            @NonNull Consumer<ExecuteAppFunctionResponse> callback) {
-        onExecuteFunction(request, cancellationSignal, callback);
-    }
-
-    /**
-     * Called by the system to execute a specific app function.
-     *
-     * <p>This method is triggered when the system requests your AppFunctionService to handle a
-     * particular function you have registered and made available.
-     *
-     * <p>To ensure proper routing of function requests, assign a unique identifier to each
-     * function. This identifier doesn't need to be globally unique, but it must be unique within
-     * your app. For example, a function to order food could be identified as "orderFood". In most
-     * cases this identifier should come from the ID automatically generated by the AppFunctions
-     * SDK. You can determine the specific function to invoke by calling {@link
-     * ExecuteAppFunctionRequest#getFunctionIdentifier()}.
-     *
-     * <p>This method is always triggered in the main thread. You should run heavy tasks on a worker
-     * thread and dispatch the result with the given callback. You should always report back the
-     * result using the callback, no matter if the execution was successful or not.
-     *
-     * @param request The function execution request.
-     * @param cancellationSignal A {@link CancellationSignal} to cancel the request.
-     * @param callback A callback to report back the result.
-     * @deprecated Use {@link #onExecuteFunction(ExecuteAppFunctionRequest, String,
-     *     CancellationSignal, Consumer)} instead. This method will be removed once usage references
-     *     are updated.
-     */
-    @MainThread
-    @Deprecated
-    public void onExecuteFunction(
-            @NonNull ExecuteAppFunctionRequest request,
-            @NonNull CancellationSignal cancellationSignal,
-            @NonNull Consumer<ExecuteAppFunctionResponse> callback) {
-        onExecuteFunction(request, callback);
-    }
-
-    /**
-     * Called by the system to execute a specific app function.
-     *
-     * <p>This method is triggered when the system requests your AppFunctionService to handle a
-     * particular function you have registered and made available.
-     *
-     * <p>To ensure proper routing of function requests, assign a unique identifier to each
-     * function. This identifier doesn't need to be globally unique, but it must be unique within
-     * your app. For example, a function to order food could be identified as "orderFood". In most
-     * cases this identifier should come from the ID automatically generated by the AppFunctions
-     * SDK. You can determine the specific function to invoke by calling {@link
-     * ExecuteAppFunctionRequest#getFunctionIdentifier()}.
-     *
-     * <p>This method is always triggered in the main thread. You should run heavy tasks on a worker
-     * thread and dispatch the result with the given callback. You should always report back the
-     * result using the callback, no matter if the execution was successful or not.
-     *
-     * @param request The function execution request.
-     * @param callback A callback to report back the result.
-     * @deprecated Use {@link #onExecuteFunction(ExecuteAppFunctionRequest, CancellationSignal,
-     *     Consumer)} instead. This method will be removed once usage references are updated.
-     */
-    @MainThread
-    @Deprecated
-    public void onExecuteFunction(
-            @NonNull ExecuteAppFunctionRequest request,
-            @NonNull Consumer<ExecuteAppFunctionResponse> callback) {
-        Log.w(
-                "AppFunctionService",
-                "Calling deprecated default implementation of onExecuteFunction");
-    }
+            @NonNull Consumer<ExecuteAppFunctionResponse> callback);
 }