diff --git a/python/requirements.txt b/python/requirements.txt
index 5d64674fe02e232c99875825655a6c5c04b9db9d..36313333b2b42601b0dabf8ffe899342820cdad5 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -9,4 +9,4 @@ Pillow
 nltk>=3.2.2
 graphviz
 six
-mpi4py=3.0.0
+mpi4py==3.0.0