diff --git a/docs/requirements.txt b/docs/requirements.txt
index 4411efe..49475d0 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -10,6 +10,6 @@ matplotlib
 pandas
 ipython
 notebook
-sphinx - toggleprompt
-sphinx - copybutton
+sphinx-toggleprompt
+sphinx-copybutton
 pygments