diff --git a/doc/requirements.txt b/doc/requirements.txt
index 58dbd15..7fc9dda 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-sphinx>=2.0.0,!=2.1.0,<=7.1.2 # BSD
+sphinx>=2.0.0,!=2.1.0 # BSD
 sphinxcontrib-httpdomain>=1.3.0 # BSD
 sphinxcontrib-pecanwsme>=0.10.0 # Apache-2.0
 sphinxcontrib-seqdiag>=0.8.4 # BSD