diff --git a/plume-common/Cargo.toml b/plume-common/Cargo.toml
index 06cf22f5..a67f748e 100644
--- a/plume-common/Cargo.toml
+++ b/plume-common/Cargo.toml
@@ -33,3 +33,6 @@ version = "0.4"
 default-features = false
 git = "https://git.joinplu.me/Plume/pulldown-cmark"
 branch = "bidi-plume"
+
+[dev-dependencies]
+once_cell = "1.5.2"