diff --git a/.github/workflows/mdbook.yml b/.github/workflows/mdbook.yml
index 12afc99..6727168 100644
--- a/.github/workflows/mdbook.yml
+++ b/.github/workflows/mdbook.yml
@@ -11,6 +11,7 @@ jobs:
     uses: ./.github/workflows/build.yml
     with:
       crate: mdbook
+      version: 0.4.41 # https://github.com/dtolnay/cxx/issues/1423
     permissions:
       contents: write
     secrets: inherit