diff --git a/src/format.ts b/src/format.ts
index 741e8c7..3a46888 100644
--- a/src/format.ts
+++ b/src/format.ts
@@ -25,7 +25,8 @@ const formatItem = (item: unknown): string => {
 
   // Check if this is an Error
   const error = ErrorType(item);
-  if (!(error instanceof type.errors)) return error.stack || error.message;
+  if (!(error instanceof type.errors))
+    return config.redact(error.stack || error.message);
 
   const stringified = (() => {
     try {
diff --git a/tests/index.test.ts b/tests/index.test.ts
index aecbb9c..07d04d9 100644
--- a/tests/index.test.ts
+++ b/tests/index.test.ts
@@ -1,4 +1,5 @@
 import { beforeAll, describe, expect, it } from "vitest";
+import { format } from "../src/format.js";
 import { setupLogging } from "../src/index.js";
 
 beforeAll(() => {
@@ -25,4 +26,12 @@ describe("logging", () => {
     );
     expect(true).toBe(true);
   });
+
+  it("redacts secret inside Error message and stack", () => {
+    const secret =
+      "78a2fca7a36abb167ecff613ce75cde8b4c04ef4579651f182a8cef9c86b00b5";
+    const result = format([new Error(`this will be redacted ${secret}`)]);
+    expect(result).not.toContain(secret);
+    expect(result).toContain("[REDACTED]");
+  });
 });