diff --git a/.binder/environment.yml b/.binder/environment.yml
index 2310763..45c3bf8 100644
--- a/.binder/environment.yml
+++ b/.binder/environment.yml
@@ -11,3 +11,6 @@ dependencies:
   - pandas-flavor >=0.1.2
   - scipy
   - jupyter
+  - pip
+  - pip:
+    - ctd @ git+https://github.com/pyoceans/python-ctd@main