diff --git a/pySDC/projects/SDC_showdown/environment.yml b/pySDC/projects/SDC_showdown/environment.yml
index fc268e8547..4cba4edf4c 100644
--- a/pySDC/projects/SDC_showdown/environment.yml
+++ b/pySDC/projects/SDC_showdown/environment.yml
@@ -5,7 +5,7 @@ channels:
   - conda-forge
 dependencies:
   - mpich
-  - petsc4py
+  - petsc4py<3.22
   - matplotlib>=3.0
   - dill>=0.2.6
   - scipy>=0.17.1