diff --git a/Project.toml b/Project.toml
index bf24709c..eb2e0bf8 100644
--- a/Project.toml
+++ b/Project.toml
@@ -22,6 +22,7 @@ Requires = "ae029012-a4dd-5104-9daa-d747884805df"
 Unicode = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"
 
 [compat]
+ACSets = "0.2"
 Artifacts = "1"
 Catlab = "0.15, 0.16"
 CombinatorialSpaces = "0.5, 0.6"