diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0ed1f8ad..31e60318 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -37,7 +37,7 @@ jobs:
 
       - name: Install latest mdbook
         run: |
-          tag=$(curl 'https://api.github.com/repos/rust-lang/mdbook/releases/latest' | jq -r '.tag_name')
+          tag="v0.4.35"
           url="https://github.com/rust-lang/mdbook/releases/download/${tag}/mdbook-${tag}-x86_64-unknown-linux-gnu.tar.gz"
           mkdir mdbook
           curl -sSL $url | tar -xz --directory=./mdbook
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 68cf08cf..86b8cec8 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -24,7 +24,7 @@ jobs:
 
       - name: Install latest mdbook
         run: |
-          tag=$(curl 'https://api.github.com/repos/rust-lang/mdbook/releases/latest' | jq -r '.tag_name')
+          tag="v0.4.35"
           url="https://github.com/rust-lang/mdbook/releases/download/${tag}/mdbook-${tag}-x86_64-unknown-linux-gnu.tar.gz"
           mkdir mdbook
           curl -sSL $url | tar -xz --directory=./mdbook