diff --git a/requirements.txt b/requirements.txt
index 07a52342..c22afa92 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ booleanOperations==0.9.0
 ufoLib2==0.16.0
 attrs==23.1.0
 cffsubr==0.2.9.post1
-compreffor==0.5.3
+compreffor==0.5.5
 ttfautohint-py==0.5.1
 
 # optional, for experimental reading/writing ufoLib2's UFO as json