diff --git a/Project.toml b/Project.toml
index 75049fb434..4f57be44eb 100644
--- a/Project.toml
+++ b/Project.toml
@@ -51,6 +51,7 @@ ArrayInterface = "7"
 DataStructures = "0.18"
 DiffEqBase = "6.147"
 DocStringExtensions = "0.9"
+EnumX = "1"
 ExponentialUtilities = "1.22"
 FastBroadcast = "0.2"
 FastClosures = "0.3"