diff --git a/packages/json-rpc-engine/src/JsonRpcEngine.ts b/packages/json-rpc-engine/src/JsonRpcEngine.ts
index bf4beaf32b..3cc4fbbd4f 100644
--- a/packages/json-rpc-engine/src/JsonRpcEngine.ts
+++ b/packages/json-rpc-engine/src/JsonRpcEngine.ts
@@ -277,8 +277,7 @@ export class JsonRpcEngine extends SafeEventEmitter {
           return handlerCallback();
         });
       } catch (error) {
-        // TODO: Explicitly handle errors thrown from `#runAllMiddleware` that are not of type `JsonRpcEngineCallbackError`
-        return end(error as JsonRpcEngineCallbackError);
+        return end(error);
       }
     };
   }
@@ -600,8 +599,7 @@ export class JsonRpcEngine extends SafeEventEmitter {
       try {
         middleware(request, response, next, end);
       } catch (error) {
-        // TODO: Explicitly handle errors thrown from `middleware` that are not of type `JsonRpcEngineCallbackError`
-        end(error as JsonRpcEngineCallbackError);
+        end(error);
       }
     });
   }
diff --git a/packages/json-rpc-engine/src/createAsyncMiddleware.ts b/packages/json-rpc-engine/src/createAsyncMiddleware.ts
index 084190959e..a24b607e4a 100644
--- a/packages/json-rpc-engine/src/createAsyncMiddleware.ts
+++ b/packages/json-rpc-engine/src/createAsyncMiddleware.ts
@@ -90,8 +90,7 @@ export function createAsyncMiddleware<
       if (returnHandlerCallback && error instanceof Error) {
         (returnHandlerCallback as ReturnHandlerCallback)(error);
       } else {
-        // TODO: Explicitly handle errors thrown from `#runReturnHandlers` that are not of type `JsonRpcEngineCallbackError`
-        end(error as JsonRpcEngineCallbackError);
+        end(error);
       }
     }
   };