diff --git a/environment.yml b/environment.yml
index 29b8a26c61b..abd45027faf 100644
--- a/environment.yml
+++ b/environment.yml
@@ -22,7 +22,7 @@ dependencies:
     - blackdoc
     - pylint
     - flake8
-    - sphinx=2.2.1
+    - sphinx
     - sphinx_rtd_theme=0.4.3
     - sphinx-gallery
     - nbsphinx
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 129df8f4475..dc7afc0d27a 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -10,7 +10,7 @@ black
 blackdoc
 pylint
 flake8
-sphinx=2.2.1
+sphinx
 sphinx_rtd_theme=0.4.3
 sphinx-gallery
 nbsphinx