diff --git a/release/constraints.txt b/release/constraints.txt
index e80b4b1024..c1cba951b4 100644
--- a/release/constraints.txt
+++ b/release/constraints.txt
@@ -78,8 +78,7 @@ Record==3.5
 RestrictedPython==5.2
 SecretStorage==2.3.1; python_version < "3.0"
 SecretStorage==3.1.2; python_version >= "3.0"
-Sphinx==1.8.5; python_version < "3.0"
-Sphinx==4.5.0; python_version >= "3.0"
+Sphinx==1.8.5
 WSGIProxy2==0.4.6; python_version < "3.0"
 WSGIProxy2==0.4.6; python_version == "3.6"
 WSGIProxy2==0.5.1; python_version > "3.6"