diff --git a/.github/workflows/deploy-github-page.yml b/.github/workflows/deploy-github-page.yml
index 5c31f9d5..9736621f 100644
--- a/.github/workflows/deploy-github-page.yml
+++ b/.github/workflows/deploy-github-page.yml
@@ -141,7 +141,7 @@ jobs:
         shell: bash -l {0}
         run: |
           micromamba activate xeus-lite-host
-          python -m pip install jupyterlite-xeus=4.0.0rc0
+          python -m pip install jupyterlite-xeus==4.0.0rc0
           jupyter lite build \
               --XeusAddon.prefix=${{ env.PREFIX }} \
               --contents README.md \
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 16515e39..0f3d7f37 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -325,7 +325,7 @@ jobs:
         shell: bash -l {0}
         run: |
           micromamba activate xeus-lite-host
-          python -m pip install jupyterlite-xeus
+          python -m pip install jupyterlite-xeus==4.0.0rc0
           jupyter lite build --XeusAddon.prefix=${{ env.PREFIX }}
 
       - name: Setup tmate session