diff --git a/.github/workflows/mdbook.yml b/.github/workflows/mdbook.yml
index b316ccd..d8035ad 100644
--- a/.github/workflows/mdbook.yml
+++ b/.github/workflows/mdbook.yml
@@ -35,8 +35,8 @@ jobs:
       - name: Install mdBook
         run: |
           mkdir mdbook
-          curl -sSL https://github.com/rust-lang/mdBook/releases/download/0.4.40/mdbook-v0.4.40-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=./mdbook
-          curl -sSL https://github.com/lzanini/mdbook-katex/releases/download/v0.9.0pub/mdbook-katex-v0.9.0-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=./mdbook      
+          curl -sSL https://github.com/rust-lang/mdBook/releases/download/v0.4.35/mdbook-v0.4.35-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=./mdbook
+          curl -sSL https://github.com/lzanini/mdbook-katex/releases/download/v0.5.8pub/mdbook-katex-v0.5.8-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=./mdbook      
           curl -sSL https://github.com/badboy/mdbook-toc/releases/download/0.14.1/mdbook-toc-0.14.1-x86_64-unknown-linux-gnu.tar.gz| tar -xz --directory=./mdbook   
           curl -sSL https://github.com/tommilligan/mdbook-admonish/releases/download/v1.13.0/mdbook-admonish-v1.13.0-x86_64-unknown-linux-gnu.tar.gz| tar -xz --directory=./mdbook
           echo `pwd`/mdbook >> $GITHUB_PATH