diff --git a/Cargo.toml b/Cargo.toml
index 3195f505..faf43af4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -28,6 +28,7 @@ webfinger = "0.4.1"
 tracing = "0.1.34"
 tracing-subscriber = "0.3.10"
 riker = "0.4.2"
+activitystreams = "0.7.0-alpha.18"
 
 [[bin]]
 name = "plume"