diff --git a/.github/workflows/merge-build-push.yml b/.github/workflows/merge-build-push.yml
index fb430c3f..1245236a 100644
--- a/.github/workflows/merge-build-push.yml
+++ b/.github/workflows/merge-build-push.yml
@@ -188,7 +188,7 @@ jobs:
       - name: Install Antora CLI
         run: |
           echo "Installing Antora packages local..."
-          npm install --global antora@3.1.7  @antora/lunr-extension  @antora/pdf-extension  @node-rs/jieba
+          npm install --global antora@3.1.7  @antora/lunr-extension  @antora/pdf-extension@1.0.0-beta.20  @node-rs/jieba
 
       - name: Build English Documentation
         working-directory: ./ivory-doc-builder
diff --git a/.github/workflows/pr-preview.yml b/.github/workflows/pr-preview.yml
index 3a0f2386..70f8fb24 100644
--- a/.github/workflows/pr-preview.yml
+++ b/.github/workflows/pr-preview.yml
@@ -109,7 +109,7 @@ jobs:
       - name: Install Antora CLI
         run: |
           echo "Installing Antora packages local..."
-          npm install --global antora@3.1.7  @antora/lunr-extension  @antora/pdf-extension  @node-rs/jieba
+          npm install --global antora@3.1.7  @antora/lunr-extension  @antora/pdf-extension@1.0.0-beta.20  @node-rs/jieba
 
       - name: Build English Documentation
         working-directory: ./ivory-doc-builder