diff --git a/.github/workflows/contrib.yml b/.github/workflows/contrib.yml
index fbf910582..8da0db698 100644
--- a/.github/workflows/contrib.yml
+++ b/.github/workflows/contrib.yml
@@ -11,6 +11,9 @@ concurrency:
 permissions:
   contents: read
 
+env:
+  MDBOOK_VERSION: 0.5.1
+
 jobs:
   deploy:
     permissions:
@@ -23,7 +26,7 @@ jobs:
     - name: Install mdbook
       run: |
         mkdir mdbook
-        curl -Lf https://github.com/rust-lang/mdBook/releases/download/v0.4.52/mdbook-v0.4.52-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=./mdbook
+        curl -Lf https://github.com/rust-lang/mdBook/releases/download/v${MDBOOK_VERSION}/mdbook-v${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=./mdbook
         echo `pwd`/mdbook >> $GITHUB_PATH
     - name: Deploy docs
       run: |
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 77eb9cd39..01eb76b8b 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -16,6 +16,9 @@ concurrency:
   group: "${{ github.workflow }}-${{ github.ref }}"
   cancel-in-progress: true
 
+env:
+  MDBOOK_VERSION: 0.5.1
+
 jobs:
   conclusion:
     needs:
@@ -290,7 +293,7 @@ jobs:
     - name: Install mdbook
       run: |
         mkdir mdbook
-        curl -Lf https://github.com/rust-lang/mdBook/releases/download/v0.4.52/mdbook-v0.4.52-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=./mdbook
+        curl -Lf https://github.com/rust-lang/mdBook/releases/download/v${MDBOOK_VERSION}/mdbook-v${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=./mdbook
         echo `pwd`/mdbook >> $GITHUB_PATH
     - run: cd src/doc && mdbook build --dest-dir ../../target/doc
     - name: Run linkchecker.sh
diff --git a/src/doc/contrib/book.toml b/src/doc/contrib/book.toml
index e322fd8f3..cdbe902c8 100644
--- a/src/doc/contrib/book.toml
+++ b/src/doc/contrib/book.toml
@@ -3,7 +3,6 @@ title = "Cargo Contributor Guide"
 authors = ["Eric Huss"]
 
 [output.html]
-curly-quotes = true # Enable smart-punctuation feature for more than quotes.
 git-repository-url = "https://github.com/rust-lang/cargo/tree/master/src/doc/contrib/src"
 edit-url-template = "https://github.com/rust-lang/cargo/edit/master/src/doc/contrib/{path}"
 search.use-boolean-and = true