diff --git a/Project.toml b/Project.toml
index 40f8c90..e4fe7bc 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "DensityRatioEstimation"
 uuid = "ab46fb84-d57c-11e9-2f65-6f72e4a7229f"
 authors = ["Kai Xu <xukai921110@gmail.com>", "Júlio Hoffimann <julio.hoffimann@gmail.com>"]
-version = "1.2.0"
+version = "1.2.1"
 
 [deps]
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
@@ -35,7 +35,7 @@ Ipopt = "1"
 JuMP = "1"
 Optim = "1"
 Parameters = "0.12"
-Statistics = "1"
+Statistics = "1.9"
 StatsBase = "0.33, 0.34"
 julia = "1.9"