diff --git a/requirements.txt b/requirements.txt
index a2f753062..33b497272 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ setuptools >= 61, != 67.2.0
 numpy  >= 1.16
 scipy  >= 1.14
 Cython >= 0.25, < 3.0
-mpi4py >= 3.0.0
+mpi4py >= 3.0.0, < 4
 
 # Required to build h5py from source
 pkgconfig