diff --git a/requirements.txt b/requirements.txt
index 4bf2295b..76c92fba 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
-ladybug-core==0.43.20
+ladybug-core==0.43.21
 ladybug-geometry-polyskel==1.7.14
 honeybee-schema==1.58.5;python_version>='3.7'