diff --git a/cvat/requirements/base.txt b/cvat/requirements/base.txt
index b8f5d0a5..b2847cbd 100644
--- a/cvat/requirements/base.txt
+++ b/cvat/requirements/base.txt
@@ -35,7 +35,7 @@ Shapely==1.7.0
 pdf2image==1.13.1
 pascal_voc_writer==0.1.4
 django-rest-auth[with_social]==0.9.5
-cython==0.29.20
+cython==0.29.21
 matplotlib==3.0.3
 scikit-image==0.15.0
 tensorflow==2.2.0