diff --git a/Project.toml b/Project.toml
index 2aedd48..a823c2c 100644
--- a/Project.toml
+++ b/Project.toml
@@ -38,6 +38,7 @@ Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
 AxisArrays = "0.4.6"
 BenchmarkTools = "1.3.1"
 CSV = "0.8.5"
+CategoricalArrays = "0.10"
 DataFrames = "1.3.4"
 Distances = "0.10.7"
 Distributions = "0.25.70"