diff --git a/flipt-engine/Cargo.toml b/flipt-engine/Cargo.toml
index 18a084ac..7139c344 100644
--- a/flipt-engine/Cargo.toml
+++ b/flipt-engine/Cargo.toml
@@ -22,7 +22,7 @@ openssl = { version = "0.10", features = ["vendored"] }
 cbindgen = "0.26.0"
 
 [dev-dependencies]
-mockall = "0.11.4"
+mockall = "0.12.1"
 
 [lib]
 name = "fliptengine"