diff --git a/src/pip.freeze b/src/pip.freeze
index 406ab63..196bfa6 100644
--- a/src/pip.freeze
+++ b/src/pip.freeze
@@ -2,7 +2,7 @@ ase
 h5py
 ipython
 lxml
-matplotlib
+matplotlib==3.4.3
 numpy
 Pint
 pandas