diff --git a/requirements.txt b/requirements.txt
index 1809fa45907541ecc2ce7ec16da2f79d88d7e168..7071f9e2c08c4e0cf38cec213f89e2ac3f77a7b5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ requests
 
 pytest
 pytest-mock
-sphinx
+sphinx~=8.1.0
 sphinx-rtd-theme
 sphinxcontrib-httpdomain
 enum-tools[sphinx]