diff --git a/README.md b/README.md
index 7a02c33..db9b047 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ A Binder-compatible repo with an `environment.yml` file.
 
 Access this Binder by clicking the blue badge above or at the following URL:
 
-http://mybinder.org/v2/gh/binder-examples/conda_environment/master?filepath=index.ipynb
+http://mybinder.org/v2/gh/binder-examples/conda_environment/main?filepath=index.ipynb
 
 ## Notes
 The `environment.yml` file should list all Python libraries on which your notebooks