diff --git a/.github/workflows/omv-ci.yml b/.github/workflows/omv-ci.yml
index d720297..b00e6b6 100644
--- a/.github/workflows/omv-ci.yml
+++ b/.github/workflows/omv-ci.yml
@@ -52,7 +52,7 @@ jobs:
     - name: Install OMV
       run: |
         pip install git+https://github.com/OpenSourceBrain/osb-model-validation # @test_nest
-        pip install scipy sympy matplotlib cython pandas tables
+        pip install scipy sympy matplotlib "cython<3.1.0" pandas tables
         sudo apt-get install libgsl27 libgslcblas0 # install GSL for ubuntu 24.04
 
     - name: Run OMV tests on engine ${{ matrix.engine }}
@@ -67,4 +67,5 @@ jobs:
       run: |
         omv list -V # list installed engines
         pip list
+        
         env