diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 856aa20..6c5fb82 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -35,7 +35,7 @@ jobs:
         with:
           node-version: 20.x
       - name: Install MyST Markdown
-        run: npm install -g mystmd@1.1.56
+        run: npm install -g mystmd@1.1.55
       - name: Build HTML Assets
         run: myst build --html
       - name: Upload artifact