diff --git a/.github/workflows/book.yml b/.github/workflows/book.yml
index 4a780ca..0be8bd1 100644
--- a/.github/workflows/book.yml
+++ b/.github/workflows/book.yml
@@ -19,7 +19,9 @@ jobs:
       - name: automesh
         run: cargo install --path .
       - name: mdbook
-        run: cargo install mdbook mdbook-cmdrun mdbook-katex mdbook-svgbob
+        run: cargo install mdbook mdbook-cmdrun mdbook-katex
+      - name: svgbob
+        run: cargo install --locked mdbook-svgbob
       - name: rust
         run: cargo build --release
       - name: maturin