diff --git a/requirements.txt b/requirements.txt
index bb04e8712477e48b631f4538a9cce1567b54a989..fae4e7bc7dfd20267a0af23260a79cdc6060e25f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -51,7 +51,8 @@ MarkupSafe==2.1.1
 matplotlib==3.5.2
 matplotlib-inline==0.1.3
 MDAnalysis==2.2.0
-mdtraj==1.9.7
+#mdtraj==1.9.7
+mdtraj @ git+https://github.com/mdtraj/mdtraj@master # fix for macOS (to be modified by a stable release of mdtraj)
 mistune==0.8.4
 mmtf-python==1.1.3
 mrcfile==1.4.2