diff --git a/.github/workflows/code_checks.yml b/.github/workflows/code_checks.yml
index 29b0129814a7..9a7dde6dfe14 100644
--- a/.github/workflows/code_checks.yml
+++ b/.github/workflows/code_checks.yml
@@ -143,7 +143,8 @@ jobs:
       - name: Install Requirements
         run: |
             sudo apt install python3-pip wget
-            sudo pip3 install cffconvert
+            # ruamel.yaml.clib 0.2.9 throws a 'TypeError: a string or stream input is required' when running cffconvert --validate
+            sudo pip3 install cffconvert "ruamel.yaml.clib<0.2.9"
 
       - name: Validate citation file
         run: |