diff --git a/pyproject.toml b/pyproject.toml
index c17c6a7..944c9ed 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,7 +28,9 @@ dependencies = [
     "google-auth>=2.49.1",
     "google-auth-oauthlib>=1.3.0",
     "html2text>=2024.2.26",
-    "jupyter-kernel-client==0.8",
+    # PyPI's 0.8 lacks wsclient symbols runtime.py needs; 0.9-0.15 has them
+    # (1.0 renames KernelClient). Range: pip takes 0.15.0, dev fork still fits.
+    "jupyter-kernel-client>=0.8,<1.0",
     "nbformat>=5.10.4",
     "packaging>=24.0",
     "prompt-toolkit>=3.0.52",