diff --git a/plume-common/Cargo.toml b/plume-common/Cargo.toml
index 02980d01..efd57b23 100644
--- a/plume-common/Cargo.toml
+++ b/plume-common/Cargo.toml
@@ -37,6 +37,7 @@ git = "https://git.joinplu.me/Plume/pulldown-cmark"
 branch = "bidi-plume"
 
 [dev-dependencies]
+assert-json-diff = "2.0.1"
 once_cell = "1.5.2"
 
 [features]