diff --git a/codex-launcher_3.12.0_all.deb b/codex-launcher_3.12.0_all.deb
deleted file mode 100644
index 471c5fc..0000000
Binary files a/codex-launcher_3.12.0_all.deb and /dev/null differ
diff --git a/codex-launcher_3.12.1_all.deb b/codex-launcher_3.12.1_all.deb
new file mode 100644
index 0000000..6a1ade4
Binary files /dev/null and b/codex-launcher_3.12.1_all.deb differ
diff --git a/src/translate-proxy.py b/src/translate-proxy.py
index 708cc7e..f511ce1 100755
--- a/src/translate-proxy.py
+++ b/src/translate-proxy.py
@@ -6571,6 +6571,9 @@ class Handler(http.server.BaseHTTPRequestHandler):
             headers["X-Client-Name"] = "antigravity"
             headers["X-Client-Version"] = _ensure_antigravity_client_version()
             headers["x-goog-api-client"] = "gl-node/18.18.2 fire/0.8.6 grpc/1.10.x"
+            # Add X-Machine-Session-Id header as seen in badrisnarayanan/antigravity-claude-proxy
+            if "request" in wrapped and "sessionId" in wrapped["request"]:
+                headers["X-Machine-Session-Id"] = wrapped["request"]["sessionId"]
         else:
             headers["User-Agent"] = "google-api-nodejs-client/9.15.1"
             headers["X-Goog-Api-Client"] = "gl-node/22.17.0"