diff --git a/request-logger/render.test.ts b/request-logger/render.test.ts
index da83a5c..1844b65 100644
--- a/request-logger/render.test.ts
+++ b/request-logger/render.test.ts
@@ -359,4 +359,18 @@ describe("renderMarkdown header redaction", () => {
     expect(out).not.toContain("secret-token");
     expect(out).toContain("[REDACTED]");
   });
+
+  it("hides the x-goog-api-key header", () => {
+    const out = renderMarkdown({
+      ...BASE,
+      agent: "Gemini CLI",
+      renderer: "gemini",
+      headers: { "x-goog-api-key": "secret-goog-key" },
+      path: "/v1beta/models/gemini-2.5-pro:generateContent",
+      requestBody: body(GEMINI_REQUEST),
+      responseRaw: "",
+    });
+    expect(out).not.toContain("secret-goog-key");
+    expect(out).toContain("[REDACTED]");
+  });
 });
diff --git a/request-logger/render.ts b/request-logger/render.ts
index bcba576..14871d1 100644
--- a/request-logger/render.ts
+++ b/request-logger/render.ts
@@ -34,7 +34,12 @@ interface RenderInput {
   responseRaw: string;
 }
 
-const REDACT = new Set(["authorization", "x-api-key", "api-key"]);
+const REDACT = new Set([
+  "authorization",
+  "x-api-key",
+  "api-key",
+  "x-goog-api-key",
+]);
 
 /**
  * Turn the raw request bytes into text.