diff --git a/Cargo.lock b/Cargo.lock
index a6028bc6f..0a1cebded 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -938,9 +938,9 @@ checksum = "ed0cfbc8191465bed66e1718596ee0b0b35d5ee1f41c5df2189d0fe8bde535ba"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.39"
+version = "1.0.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c54b25569025b7fc9651de43004ae593a75ad88543b17178aa5e1b9c4f15f56f"
+checksum = "dd96a1e8ed2596c337f8eae5f24924ec83f5ad5ab21ea8e455d3566c69fbcaf7"
 dependencies = [
  "unicode-ident",
 ]
diff --git a/dropshot/Cargo.toml b/dropshot/Cargo.toml
index ede06af09..71311e56b 100644
--- a/dropshot/Cargo.toml
+++ b/dropshot/Cargo.toml
@@ -22,7 +22,7 @@ indexmap = "1.8.2"
 openapiv3 = "=1.0.1"
 paste = "1.0.7"
 percent-encoding = "2.1.0"
-proc-macro2 = "1.0.39"
+proc-macro2 = "1.0.40"
 rustls = "0.20.6"
 rustls-pemfile = "1.0.0"
 serde_json = "1.0.81"