diff --git a/pynemo_37.yml b/pynemo_37.yml
index 21ab2e875aa28671e7e74823bf9fbd2dfc2067aa..ff7b43628d18db569625fc465371fdd61af35d72 100644
--- a/pynemo_37.yml
+++ b/pynemo_37.yml
@@ -17,4 +17,6 @@ dependencies:
     - pyjnius==1.2.1
     - seawater==3.3.4
     - thredds-crawler==1.5.4
-    - motuclient==1.8.4
\ No newline at end of file
+    - motuclient==1.8.4
+    - sphinx==3.0.2
+    - sphinx-rtd-theme==0.4.3
\ No newline at end of file