diff --git a/docs/environment.yml b/docs/environment.yml
index b0c10b2..86c08d5 100644
--- a/docs/environment.yml
+++ b/docs/environment.yml
@@ -1,10 +1,10 @@
 name: ipython_docs
 dependencies:
 - python=3.6
-- prompt_toolkit>2
-- ipykernel
 - setuptools>=18.5
 - sphinx>=1.8
 - sphinx_rtd_theme
 - pip:
     - docrepr
+    - prompt_toolkit
+    - ipython