diff --git a/setup.cfg b/setup.cfg
index ec2efe97d183048e08a3742ceb38c5a1fc183b1f..b547bd771747ee6077e760fe5cac70cd78f0d3e2 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -30,6 +30,6 @@ install_requires =
     scipy>=1.1
     mdanalysis>=2.0
     appdirs>=1.4
-    cadnano @ git+git://github.com/cadnano/cadnano2.5
+    cadnano @ git+https://github.com/cadnano/cadnano2.5
 python_requires = >=3.5
 zip_safe = no