diff --git a/.readthedocs.yml b/.readthedocs.yml
index ea4f37e2..cefe43e7 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -18,4 +18,10 @@ sphinx:
 
 python:
   install:
+
+    # Install package.
+    - method: pip
+      path: .
+
+    # Install Sphinx.
     - requirements: docs/requirements-docs.txt
diff --git a/docs/requirements-docs.txt b/docs/requirements-docs.txt
index ec377b15..4d97d20b 100644
--- a/docs/requirements-docs.txt
+++ b/docs/requirements-docs.txt
@@ -1,9 +1,5 @@
 numpydoc
 sphinx
 sphinx_rtd_theme
-tornado
-toolz
-zict
 pandas
-dask
-distributed
+dask[distributed]