diff --git a/.github/workflows/merge-build-push.yml b/.github/workflows/merge-build-push.yml
index cb6be8f4..a7df4102 100644
--- a/.github/workflows/merge-build-push.yml
+++ b/.github/workflows/merge-build-push.yml
@@ -192,7 +192,7 @@ 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 82584a0d..8501f670 100644
--- a/.github/workflows/pr-preview.yml
+++ b/.github/workflows/pr-preview.yml
@@ -107,7 +107,7 @@ 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