diff --git a/global-requirements.txt b/global-requirements.txt
index 829464d529..998816dfb5 100644
--- a/global-requirements.txt
+++ b/global-requirements.txt
@@ -441,7 +441,7 @@ selenium  # Apache-2.0
 # Blacklist setuptools 36.2.0 due to https://github.com/pypa/setuptools/issues/1086
 # Blacklist setuptools 48.0.0, 49.0.0 due to https://github.com/pypa/setuptools/issues/2232
 setuptools!=24.0.0,!=34.0.0,!=34.0.1,!=34.0.2,!=34.0.3,!=34.1.0,!=34.1.1,!=34.2.0,!=34.3.0,!=34.3.1,!=34.3.2,!=36.2.0,!=48.0.0,!=49.0.0  # PSF/ZPL
-sphinx!=1.6.6,!=1.6.7,!=2.1.0,!=3.0.0  # BSD
+sphinx!=1.6.6,!=1.6.7,!=2.1.0,!=3.0.0,!=3.4.2  # BSD
 sphinx-testing  # BSD License
 sphinxcontrib-actdiag  # BSD
 sphinxcontrib-apidoc  # BSD