diff --git a/.github/workflows/IR.yml b/.github/workflows/IR.yml
index c5187da654..891de2bfbb 100644
--- a/.github/workflows/IR.yml
+++ b/.github/workflows/IR.yml
@@ -34,8 +34,14 @@ jobs:
       - name: Install dependencies
         run: |
           pip install ".[dev]"
+          solc-select install 0.5.0         
           solc-select use 0.8.11 --always-install
 
+      - name: Install old solc
+        if: matrix.os == 'ubuntu-latest'
+        run: solc-select install 0.4.0
+
+
       - name: Test with pytest
         run: |
-          pytest tests/test_ssa_generation.py
+          pytest tests/test_ssa_generation.py
\ No newline at end of file