diff --git a/Dockerfile b/Dockerfile
index 6d0eab3..ccf3d9a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,6 +16,8 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     npm \
     # Browser for OAuth authentication
     firefox-esr \
+    # xdg-open for opening URLs (used by Claude CLI)
+    xdg-utils \
     # X11 libraries for display
     libx11-6 \
     libxext6 \