diff --git a/Project.toml b/Project.toml
index c2be732..095cd2d 100644
--- a/Project.toml
+++ b/Project.toml
@@ -12,6 +12,7 @@ QuadGK = "1fd47b50-473d-5c70-9696-f719f8f3bcdc"
 [compat]
 Interpolations = "^0.12"
 Optim = "^0.20, 0.21"
+QuadGK = "^2"
 julia = "^1.1"
 
 [extras]