diff --git a/docs/requirements.txt b/docs/requirements.txt
index 08338de7a..749bb4749 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,5 +1,5 @@
 # requirements to build documentation
-Sphinx<2.0
+Sphinx==8.1.1
 sphinxcontrib-issuetracker
 alabaster==0.7.13
 doc8