diff --git a/docs/requirements.txt b/docs/requirements.txt
index b0937289..6614e6b8 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,3 @@
-sphinx = 4.3.2 # For sphinx documentation
+sphinx == 4.3.2 # For sphinx documentation
 sphinx_rtd_theme == 1.0.0
 IPython == 7.30.1 # For sphinx documentation