diff --git a/arrow-flight/gen/Cargo.toml b/arrow-flight/gen/Cargo.toml
index c4bbf4b618db..8c4587cec845 100644
--- a/arrow-flight/gen/Cargo.toml
+++ b/arrow-flight/gen/Cargo.toml
@@ -32,6 +32,6 @@ publish = false
 [dependencies]
 # Pin specific version of the tonic-build dependencies to avoid auto-generated
 # (and checked in) arrow.flight.protocol.rs from changing
-proc-macro2 = { version = "=1.0.84", default-features = false }
+proc-macro2 = { version = "=1.0.85", default-features = false }
 prost-build = { version = "=0.12.6", default-features = false }
 tonic-build = { version = "=0.11.0", default-features = false, features = ["transport", "prost"] }