diff --git a/Cargo.lock b/Cargo.lock
index a7767c3af92..ee7a0cc9b40 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3526,9 +3526,9 @@ checksum = "7c68cb38ed13fd7bc9dd5db8f165b7c8d9c1a315104083a2b10f11354c2af97f"
 
 [[package]]
 name = "postgres-protocol"
-version = "0.6.3"
+version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "79ec03bce71f18b4a27c4c64c6ba2ddf74686d69b91d8714fb32ead3adaed713"
+checksum = "878c6cbf956e03af9aa8204b407b9cbf47c072164800aa918c516cd4b056c50c"
 dependencies = [
  "base64",
  "byteorder",
@@ -4964,9 +4964,9 @@ checksum = "6bdef32e8150c2a081110b42772ffe7d7c9032b606bc226c8260fd97e0976601"
 
 [[package]]
 name = "syn"
-version = "1.0.91"
+version = "1.0.92"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b683b2b825c8eef438b77c36a06dc262294da3d5a5813fac20da149241dcd44d"
+checksum = "7ff7c592601f11445996a06f8ad0c27f094a58857c2f89e97974ab9235b92c52"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/test-utils/Cargo.toml b/test-utils/Cargo.toml
index c20c8833bf4..6a68df9ed26 100644
--- a/test-utils/Cargo.toml
+++ b/test-utils/Cargo.toml
@@ -9,7 +9,7 @@ anyhow = "1.0"
 futures = "0.3.21"
 libc = "0.2.123"
 omicron-common = { path = "../common" }
-postgres-protocol = "0.6.3"
+postgres-protocol = "0.6.4"
 signal-hook = "0.3"
 structopt = "0.3"
 subprocess = "0.2.8"