diff --git a/packages/jspsych/src/ExtensionManager.spec.ts b/packages/jspsych/src/ExtensionManager.spec.ts
index 8f634a4bbe..a14fb21b9b 100644
--- a/packages/jspsych/src/ExtensionManager.spec.ts
+++ b/packages/jspsych/src/ExtensionManager.spec.ts
@@ -102,8 +102,6 @@ describe("ExtensionManager", () => {
 
       const onFinishCallback = jest.mocked(manager.extensions.test.on_finish);
       onFinishCallback.mockReturnValue({
-        extension_type: "test",
-        extension_version: "1.0",
         extension: "result",
       });
 
@@ -115,7 +113,7 @@ describe("ExtensionManager", () => {
       expect(onFinishCallback).toHaveBeenCalledWith({ my: "option" });
       expect(results).toEqual({
         extension_type: ["test"],
-        extension_version: ["1.0"],
+        extension_version: ["0.0.1"],
         extension: "result",
       });
     });
diff --git a/packages/jspsych/tests/extensions/test-extension.ts b/packages/jspsych/tests/extensions/test-extension.ts
index d7391daada..c649ae0fec 100644
--- a/packages/jspsych/tests/extensions/test-extension.ts
+++ b/packages/jspsych/tests/extensions/test-extension.ts
@@ -3,6 +3,8 @@ import { JsPsych, JsPsychExtension } from "../../src";
 export class TestExtension implements JsPsychExtension {
   static info = {
     name: "test",
+    version: "0.0.1",
+    data: {},
   };
 
   constructor(private jsPsych: JsPsych) {}