diff --git a/python_requirements.txt b/python_requirements.txt
index 18e3c75b72295809da50b029e8656fd9884261f9..6f4e21c1a2b29f4c0aaffac70301070657f67abf 100644
--- a/python_requirements.txt
+++ b/python_requirements.txt
@@ -1,6 +1,6 @@
-numpy
-scipy
-matplotlib
+numpy==1.21.6
+scipy==1.8.1
+matplotlib==3.6.2
 mpi4py
 doxypypy
 jupyter