diff --git a/etc/environment-fenics.yml b/etc/environment-fenics.yml
index f18f927df1..443a45ef9e 100644
--- a/etc/environment-fenics.yml
+++ b/etc/environment-fenics.yml
@@ -8,6 +8,7 @@ dependencies:
   - matplotlib>=3.0
   - dill>=0.2.6
   - fenics>=2019.1.0
+  - mpi4py<=3.1.4
   - pytest
   - pytest-cov
   - pytest-timeout