diff --git a/.changeset/blue-islands-unite.md b/.changeset/blue-islands-unite.md
new file mode 100644
index 000000000..5c63f7509
--- /dev/null
+++ b/.changeset/blue-islands-unite.md
@@ -0,0 +1,5 @@
+---
+"@browserbasehq/stagehand": major
+---
+
+Add support for client certificates on local envs
diff --git a/lib/index.ts b/lib/index.ts
index 04cd4a5bf..300e3178d 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -309,6 +309,7 @@ async function getBrowser(
       handleSIGINT: localBrowserLaunchOptions?.handleSIGINT ?? true,
       handleSIGTERM: localBrowserLaunchOptions?.handleSIGTERM ?? true,
       ignoreDefaultArgs: localBrowserLaunchOptions?.ignoreDefaultArgs,
+      clientCertificates: localBrowserLaunchOptions?.clientCertificates,
     });
 
     if (localBrowserLaunchOptions?.cookies) {
diff --git a/types/stagehand.ts b/types/stagehand.ts
index 50f2ac2a5..d5fe4743a 100644
--- a/types/stagehand.ts
+++ b/types/stagehand.ts
@@ -174,6 +174,16 @@ export interface ObserveResult {
 export interface LocalBrowserLaunchOptions {
   args?: string[];
   chromiumSandbox?: boolean;
+  clientCertificates?: Array<{
+    origin: string;
+    certPath?: string;
+    cert?: Buffer;
+    keyPath?: string;
+    key?: Buffer;
+    pfxPath?: string;
+    pfx?: Buffer;
+    passphrase?: string;
+  }>;
   devtools?: boolean;
   env?: Record<string, string | number | boolean>;
   executablePath?: string;