diff --git a/Cargo.toml b/Cargo.toml
index b67879f0..2faaa6cc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,7 +12,7 @@ version = "0.8.0"
 
 [dependencies]
 ruma-identifiers = "0.11"
-ruma-signatures = "0.3"
+ruma-signatures = "0.4"
 serde = "1.0"
 serde_derive = "1.0"
 serde_json = "1.0"