diff --git a/setup.cfg b/setup.cfg
index f1c282b6..79c2dcf2 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -33,7 +33,7 @@ python_requires = >=3.7,<4
 packages = find:
 zip_safe = False
 install_requires =
-    lsprotocol
+    lsprotocol==2023.0.0a1
     typeguard>=3,<4
 include_package_data = True
 tests_require =