diff --git a/pySDC/projects/compression/Docker/install_pySDC.sh b/pySDC/projects/compression/Docker/install_pySDC.sh
index 5dfce6b4b0..259bc9be6b 100644
--- a/pySDC/projects/compression/Docker/install_pySDC.sh
+++ b/pySDC/projects/compression/Docker/install_pySDC.sh
@@ -15,7 +15,7 @@ cd /pySDC
 pip install -e .
 python -m pip install pytest
 python -m pip install coverage
-python -m pip install mpi4py
+python -m pip install "mpi4py<4.1.0"
 
 # go back to original working directory
 cd $current_dir