diff --git a/pyproject.toml b/pyproject.toml
index 98cc38f..963ab46 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,7 @@ dependencies= [
 "ufo2ft",
 "youseedee",
 "PyYAML",
-"protobuf >=3.20.3",
+"protobuf >=5.26.0",
 ]
 
 [project.urls]