diff --git a/Project.toml b/Project.toml
index c3b3ada..ae75704 100644
--- a/Project.toml
+++ b/Project.toml
@@ -15,11 +15,11 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [compat]
 julia ="1.0.0"
-HTTP = "0.7.0"
-JSON = "0.19.0"
-LibExpat = "0.5.0"
+HTTP >= "0.7.0"
+JSON >= "0.19.0"
+LibExpat >= "0.5.0"
 LightGraphs = "1.1.0"
-DataStructures ="0.15.0"
+DataStructures >="0.15.0"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"