diff --git a/requirements.txt b/requirements.txt
index eb3383dc520591a918a7565d0062a67f484df243..cfc8770cfb207e0b0d8902cd0aaf3e4bd9ab703a 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,12 +6,11 @@ ase==3.15.0
 setuptools
 scipy
 mdtraj==1.9.1
-panedr==0.2
 mdanalysis==0.16.2
+panedr==0.2
 parmed==3.0.0
 pandas
 pyyaml
 h5py
 hjson
 enum34
-systax==0.1.3