diff --git a/rust/letterbox-proxy/Cargo.toml b/rust/letterbox-proxy/Cargo.toml
index d411064..ab4d0d2 100644
--- a/rust/letterbox-proxy/Cargo.toml
+++ b/rust/letterbox-proxy/Cargo.toml
@@ -76,7 +76,7 @@ uniffi = { version = "0.31.0", features = ["build"] }
 
 [dev-dependencies]
 tokio-test = "0.4.5"
-mockall = "0.14.0"
+mockall = "0.15.0"
 tempfile = "3.24.0"
 once_cell = "1.21.3"
 wiremock = "0.6.5"