diff --git a/Cargo.toml b/Cargo.toml
index 8dcc224..7c8a209 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,7 +23,7 @@ itoa = "1.0"
 parking_lot = "0.12"
 prometheus-client-derive-encode = { version = "0.4.1", path = "derive-encode" }
 prost = { version = "0.11.0", optional = true }
-prost-types = { version = "0.11.0", optional = true }
+prost-types = { version = "0.12.0", optional = true }
 
 [dev-dependencies]
 async-std = { version = "1", features = ["attributes"] }