diff --git a/packages/rrdom/test/diff.test.ts b/packages/rrdom/test/diff.test.ts
index 67c5f652d5..00d31201c0 100644
--- a/packages/rrdom/test/diff.test.ts
+++ b/packages/rrdom/test/diff.test.ts
@@ -1831,13 +1831,13 @@ describe('diff algorithm for rrdom', () => {
 
     it('should not drop inserted styles when moving a style element with inserted styles', async () => {
       function MockCSSStyleSheet() {
-        this.replaceSync = jest.fn();
+        this.replaceSync = vi.fn();
         this.cssRules = [{ cssText: baseStyle }];
       }
 
-      jest
-        .spyOn(window, 'CSSStyleSheet')
-        .mockImplementationOnce(MockCSSStyleSheet as any);
+      vi.spyOn(window, 'CSSStyleSheet').mockImplementationOnce(
+        MockCSSStyleSheet as any,
+      );
 
       const baseStyle = 'body {margin: 0;}';
       const insertedStyle = 'div {display: flex;}';