diff --git a/Project.toml b/Project.toml
index e75d056..cfb746f 100644
--- a/Project.toml
+++ b/Project.toml
@@ -19,18 +19,19 @@ StructEquality = "6ec83bb0-ed9f-11e9-3b4c-2b04cb4e219c"
 Tables = "bd369af6-aec1-5ad0-b16a-f7cc5008161c"
 
 [weakdeps]
-nauty_jll = "55c6dc9b-343a-50ca-8ff2-b71adb3733d5"
 XLSX = "fdbf4ff8-1666-58a4-91e7-1b58723a45e0"
+nauty_jll = "55c6dc9b-343a-50ca-8ff2-b71adb3733d5"
 
 [extensions]
-ExcelACSets = "XLSX"
 ACSetsnauty_jllExt = "nauty_jll"
+ExcelACSets = "XLSX"
 
 [compat]
 CompTime = "0.1"
 JSON = "0.21"
 MLStyle = "0.4"
 OrderedCollections = "1"
+Permutations = "0.4"
 PrettyTables = "2.2"
 Reexport = "1"
 StaticArrays = "1"