diff --git a/setup.cfg b/setup.cfg
index e0bd44c8..02b42b2d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -38,6 +38,7 @@ install-requires =  # ?? requires-dist?
     vermouth >= 0.9.6
     scipy >= 1.6.0
     tqdm
+    cgsmiles @ git+https://github.com/gruenewald-lab/CGsmiles.git@master
 zip-safe = False