diff --git a/Project.toml b/Project.toml
index 125e17e..3066c76 100644
--- a/Project.toml
+++ b/Project.toml
@@ -18,6 +18,7 @@ YAML = "ddb6d928-2868-570f-bddf-ab3f9cf99eb6"
 
 [compat]
 Highlights = "0.3.1, 0.4"
+JSON = "0.21"
 Mustache = "0.4.1, 0.5, 1"
 Plots = "0.19, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29"
 YAML = "0.3"