diff --git a/.github/workflows/cd.yml b/.github/workflows/cd.yml
index 237a614..011f264 100644
--- a/.github/workflows/cd.yml
+++ b/.github/workflows/cd.yml
@@ -95,7 +95,7 @@ jobs:
         python-version: '3.10'
 
     - name: Install flit
-      run: pip install flit~=3.4
+      run: pip install 'flit~=3.4' 'flit_core<4'
 
     - name: Build and publish
       run: flit publish