diff --git a/.github/workflows/cargo-test.yml b/.github/workflows/cargo-test.yml
index 77df172..935793a 100644
--- a/.github/workflows/cargo-test.yml
+++ b/.github/workflows/cargo-test.yml
@@ -20,7 +20,7 @@ jobs:
       - name: Install Python dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install ply six
+          pip install packaging ply six
 
       - name: Run the generator
         run: python generate.py
diff --git a/stone b/stone
index 0c9ceb7..f7a29d5 160000
--- a/stone
+++ b/stone
@@ -1 +1 @@
-Subproject commit 0c9ceb748ac4dcdea5ff69c97704daccdcb7e60e
+Subproject commit f7a29d5222819e1b3332198fa83af6f81c5c0d73