diff --git a/requirements.txt b/requirements.txt
index 99097058c..c28f6b8c0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -237,7 +237,7 @@ sphinxcontrib-serializinghtml==2.0.0
     # via sphinx
 stack-data==0.6.3
     # via ipython
-tinycss2==1.4.0
+tinycss2==1.5.1
     # via bleach
 tornado==6.5.4
     # via