diff --git a/Project.toml b/Project.toml
index a2d65074..6ea3217e 100644
--- a/Project.toml
+++ b/Project.toml
@@ -30,7 +30,7 @@ Aqua = "0.8.14"
 ArgParse = "1.1"
 CodecZlib = "0.7"
 CodecZstd = "0.8"
-EDM4hep = "0.4.0"
+EDM4hep = "0.4.0, 1.0"
 EnumX = "1.0.4"
 JSON = "0.21, 1.2"
 Logging = "1.10"