diff --git a/contrib/Cargo.toml b/contrib/Cargo.toml
index c0af1bb0..0e19c9d6 100644
--- a/contrib/Cargo.toml
+++ b/contrib/Cargo.toml
@@ -25,7 +25,7 @@ rocket = { version = "0.1.6", path = "../lib/" }
 log = "^0.3"
 
 # UUID dependencies.
-uuid = { version = "^0.3", optional = true }
+uuid = { version = "^0.4", optional = true }
 
 # JSON and templating dependencies.
 serde = { version = "^0.9", optional = true }
diff --git a/examples/uuid/Cargo.toml b/examples/uuid/Cargo.toml
index d94f1d0b..06ab2b76 100644
--- a/examples/uuid/Cargo.toml
+++ b/examples/uuid/Cargo.toml
@@ -6,7 +6,7 @@ workspace = "../../"
 [dependencies]
 rocket = { path = "../../lib" }
 rocket_codegen = { path = "../../codegen" }
-uuid = "^0.3"
+uuid = "^0.4"
 lazy_static = "^0.2"
 
 [dependencies.rocket_contrib]