diff --git a/ci/doc_requirements.txt b/ci/doc_requirements.txt
index f7e2b5509..28d26f0c1 100644
--- a/ci/doc_requirements.txt
+++ b/ci/doc_requirements.txt
@@ -1,4 +1,4 @@
-cartopy==0.20
+cartopy==0.21
 matplotlib==3.5.3
 metpy==1.2.0
 pint==0.19