diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 85be65e..dbdd9c0 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -135,7 +135,7 @@ jobs:
         with: { java-version: "11", java-package: jre }
 
       - name: Install Certora CLI
-        run: pip3 install certora-cli==6.3.1
+        run: pip3 install certora-cli==5.0.5
 
       - name: Install Solidity
         run: |