diff --git a/Project.toml b/Project.toml
index beb0c59..2a74776 100644
--- a/Project.toml
+++ b/Project.toml
@@ -16,5 +16,6 @@ Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 AbstractMCMC = "2, 3, 4, 5"
 Accessors = "0.1"
 DensityInterface = "0.4"
+JSON = "0.19 - 0.21"
 Random = "1.6"
 julia = "~1.6.6, 1.7.3"