diff --git a/Project.toml b/Project.toml
index 3976c06..629e350 100644
--- a/Project.toml
+++ b/Project.toml
@@ -24,6 +24,7 @@ LabelledArrays = "1"
 Optim = "1"
 RecursiveArrayTools = "2"
 StaticArrays = "1"
+TimeZones = "1"
 julia = "1.6, 1.7"
 
 [extras]