diff --git a/.changeset/vitest-outputgate-noise.md b/.changeset/vitest-outputgate-noise.md
new file mode 100644
index 0000000000..fd951709ed
--- /dev/null
+++ b/.changeset/vitest-outputgate-noise.md
@@ -0,0 +1,5 @@
+---
+"@cloudflare/vitest-pool-workers": patch
+---
+
+fix: suppress `outputGateBroken` stderr noise when testing Workflows
diff --git a/packages/vitest-pool-workers/src/pool/index.ts b/packages/vitest-pool-workers/src/pool/index.ts
index 2259668fd4..b6682a4030 100644
--- a/packages/vitest-pool-workers/src/pool/index.ts
+++ b/packages/vitest-pool-workers/src/pool/index.ts
@@ -80,6 +80,7 @@ const ignoreMessages = [
 	"disconnected: operation canceled",
 	"disconnected: worker_do_not_log; Request failed due to internal error",
 	"disconnected: WebSocket was aborted",
+	"broken.outputGateBroken; jsg.Error: Instance dispose",
 ];
 function trimSymbolizerWarning(chunk: string): string {
 	return chunk.includes(symbolizerWarning)