diff --git a/requirements-docs.txt b/requirements-docs.txt
index c081b17c..73bb0277 100644
--- a/requirements-docs.txt
+++ b/requirements-docs.txt
@@ -21,7 +21,7 @@ requests==2.25.1          # via sphinx
 six==1.15.0               # via packaging, sphinxcontrib-httpdomain
 snowballstemmer==2.0.0    # via sphinx
 sphinx-rtd-theme==0.5.0   # via -r requirements-docs.in
-sphinx==3.3.1             # via -r requirements-docs.in, sphinx-rtd-theme, sphinxcontrib-httpdomain
+sphinx==3.4.2             # via -r requirements-docs.in, sphinx-rtd-theme, sphinxcontrib-httpdomain
 sphinxcontrib-applehelp==1.0.2  # via sphinx
 sphinxcontrib-devhelp==1.0.2  # via sphinx
 sphinxcontrib-htmlhelp==1.0.3  # via sphinx