diff --git a/arrow-flight/gen/Cargo.toml b/arrow-flight/gen/Cargo.toml
index 74e636426a75..fcf81a845d73 100644
--- a/arrow-flight/gen/Cargo.toml
+++ b/arrow-flight/gen/Cargo.toml
@@ -33,5 +33,5 @@ publish = false
 # Pin specific version of the tonic-build dependencies to avoid auto-generated
 # (and checked in) arrow.flight.protocol.rs from changing
 proc-macro2 = { version = "=1.0.79", default-features = false }
-prost-build = { version = "=0.12.3", default-features = false }
+prost-build = { version = "=0.12.4", default-features = false }
 tonic-build = { version = "=0.11.0", default-features = false, features = ["transport", "prost"] }
diff --git a/arrow-flight/src/arrow.flight.protocol.rs b/arrow-flight/src/arrow.flight.protocol.rs
index 67265e781786..bc314de9d19f 100644
--- a/arrow-flight/src/arrow.flight.protocol.rs
+++ b/arrow-flight/src/arrow.flight.protocol.rs
@@ -1,5 +1,6 @@
 // This file was automatically generated through the build.rs script, and should not be edited.
 
+// This file is @generated by prost-build.
 ///
 /// The request that a client provides to a server on handshake.
 #[allow(clippy::derive_partial_eq_without_eq)]
diff --git a/arrow-flight/src/sql/arrow.flight.protocol.sql.rs b/arrow-flight/src/sql/arrow.flight.protocol.sql.rs
index 01ea9b61a8f7..c1f0fac0f6ba 100644
--- a/arrow-flight/src/sql/arrow.flight.protocol.sql.rs
+++ b/arrow-flight/src/sql/arrow.flight.protocol.sql.rs
@@ -1,5 +1,6 @@
 // This file was automatically generated through the build.rs script, and should not be edited.
 
+// This file is @generated by prost-build.
 ///
 /// Represents a metadata request. Used in the command member of FlightDescriptor
 /// for the following RPC calls: