diff --git a/requirements.txt b/requirements.txt
index 89751569..ff1faf03 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 fonttools[lxml,unicode,ufo,repacker]==4.46.0; platform_python_implementation == 'CPython'
 fonttools[unicode,ufo,repacker]==4.46.0; platform_python_implementation != 'CPython'
-glyphsLib==6.4.1
+glyphsLib==6.6.0
 ufo2ft==2.33.4
 fontMath==0.9.3
 booleanOperations==0.9.0