diff --git a/requirements.txt b/requirements.txt
index da0ce7e0..dbbdcd74 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,4 +12,4 @@ ttfautohint-py==0.5.1
 
 # optional, for experimental reading/writing ufoLib2's UFO as json
 cattrs==23.2.3
-orjson==3.9.13; platform_python_implementation == 'CPython'
+orjson==3.9.15; platform_python_implementation == 'CPython'