diff --git a/elm.json b/elm.json
index fa8fca05..02a3dd68 100644
--- a/elm.json
+++ b/elm.json
@@ -19,6 +19,7 @@
         "stil4m/elm-syntax": "7.1.3 <= v < 8.0.0"
     },
     "test-dependencies": {
-        "elm/regex": "1.0.0 <= v < 2.0.0"
+        "elm/regex": "1.0.0 <= v < 2.0.0",
+        "elm/json": "1.1.3 <= v < 2.0.0"
     }
 }