diff --git a/Cargo.lock b/Cargo.lock
index b5136b8a..d039f82c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2076,9 +2076,9 @@ checksum = "879d54834c8c76457ef4293a689b2a8c59b076067ad77b15efafbb05f92a592b"
 
 [[package]]
 name = "iri-string"
-version = "0.5.4"
+version = "0.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6e76a2a488a2bce15f9e696e3b9b66a4e1412c13339344bba8a24b7eae30f91b"
+checksum = "bf071934ee7ee97e52fa1868a9540a7885eab75926bd70794030304a9797cea1"
 dependencies = [
  "serde 1.0.137",
 ]
diff --git a/plume-common/Cargo.toml b/plume-common/Cargo.toml
index 1bc5ef5f..29bfabee 100644
--- a/plume-common/Cargo.toml
+++ b/plume-common/Cargo.toml
@@ -19,7 +19,7 @@ syntect = "4.5.0"
 regex-syntax = { version = "0.6.26", default-features = false, features = ["unicode-perl"] }
 tracing = "0.1.35"
 askama_escape = "0.10.3"
-activitystreams = "0.7.0-alpha.18"
+activitystreams = "=0.7.0-alpha.20"
 activitystreams-ext = "0.1.0-alpha.2"
 url = "2.2.2"
 flume = "0.10.13"
diff --git a/plume-models/Cargo.toml b/plume-models/Cargo.toml
index 9629e277..0d7d0303 100644
--- a/plume-models/Cargo.toml
+++ b/plume-models/Cargo.toml
@@ -34,7 +34,7 @@ riker = "0.4.2"
 once_cell = "1.12.0"
 lettre = "0.9.6"
 native-tls = "0.2.10"
-activitystreams = "0.7.0-alpha.18"
+activitystreams = "=0.7.0-alpha.20"
 
 [dependencies.chrono]
 features = ["serde"]