diff --git a/Project.toml b/Project.toml
index af37a7b..913f8f3 100644
--- a/Project.toml
+++ b/Project.toml
@@ -12,6 +12,8 @@ MbedTLS = "739be429-bea8-5141-9913-cc70e7f3736d"
 [compat]
 julia = "~1"
 HTTP = "~0.8"
+JSON = "0.20, 0.21"
+MbedTLS = "0.6.8, 0.7, 1"
 
 [extras]
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"