diff --git a/docs/environment.yml b/docs/environment.yml
index 628f31e..afb5eff 100644
--- a/docs/environment.yml
+++ b/docs/environment.yml
@@ -1,13 +1,17 @@
 name: ipython_docs
+channels:
+ - conda-forge
+ - defaults
 dependencies:
-- python=3.8
-- setuptools>=18.5
-- sphinx>=4.2
-- sphinx_rtd_theme>=1.0
-- numpy
-- testpath
-- matplotlib
-- pip:
+  - python=3.8
+  - setuptools>=18.5
+  - sphinx>=4.2
+  - sphinx_rtd_theme>=1.0
+  - numpy
+  - nose
+  - testpath
+  - matplotlib
+  - pip:
     - docrepr
     - prompt_toolkit
     - ipykernel