diff --git a/.readthedocs.yml b/.readthedocs.yml
index 7a91223..c72bd78 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -9,15 +9,13 @@ sphinx:
 
 # Set the version of Python and requirements required to build your docs
 python:
-  version: 3.7
+  version: 3.8
   system_packages: true
   install:
-    - requirements: docs/requirements.txt
     - method: pip
       path: .
-
-submodules:
-  include: all
+      extra_requirements:
+        - docs
 
 # Don't build any extra formats
 formats: []
diff --git a/docs/requirements.txt b/docs/requirements.txt
deleted file mode 100644
index bf6ffa9..0000000
--- a/docs/requirements.txt
+++ /dev/null
@@ -1,5 +0,0 @@
-Cython
-numpy
-astropy
-matplotlib
-sphinx-astropy