diff --git a/Cargo.lock b/Cargo.lock
index 8d2124152fe..d4b01f77dc8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -258,6 +258,15 @@ dependencies = [
  "generic-array 0.14.4",
 ]
 
+[[package]]
+name = "block-buffer"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1d36a02058e76b040de25a4464ba1c80935655595b661505c8b39b664828b95"
+dependencies = [
+ "generic-array 0.14.4",
+]
+
 [[package]]
 name = "block-padding"
 version = "0.1.5"
@@ -591,6 +600,15 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "crypto-common"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "567569e659735adb39ff2d4c20600f7cd78be5471f8c58ab162bce3c03fdbc5f"
+dependencies = [
+ "generic-array 0.14.4",
+]
+
 [[package]]
 name = "crypto-mac"
 version = "0.11.1"
@@ -778,6 +796,18 @@ dependencies = [
  "generic-array 0.14.4",
 ]
 
+[[package]]
+name = "digest"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8549e6bfdecd113b7e221fe60b433087f6957387a20f8118ebca9b12af19143d"
+dependencies = [
+ "block-buffer 0.10.0",
+ "crypto-common",
+ "generic-array 0.14.4",
+ "subtle",
+]
+
 [[package]]
 name = "dirs-next"
 version = "2.0.0"
@@ -908,7 +938,7 @@ checksum = "43ee23aa5b4f68c7a092b5c3beb25f50c406adc75e2363634f242f28ab255372"
 dependencies = [
  "der",
  "elliptic-curve",
- "hmac",
+ "hmac 0.11.0",
  "signature",
 ]
 
@@ -1281,6 +1311,15 @@ dependencies = [
  "digest 0.9.0",
 ]
 
+[[package]]
+name = "hmac"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ddca131f3e7f2ce2df364b57949a9d47915cfbd35e46cfee355ccebbf794d6a2"
+dependencies = [
+ "digest 0.10.0",
+]
+
 [[package]]
 name = "home"
 version = "0.5.3"
@@ -1499,7 +1538,7 @@ dependencies = [
  "cfg-if",
  "ecdsa",
  "elliptic-curve",
- "sha2",
+ "sha2 0.9.8",
 ]
 
 [[package]]
@@ -1595,13 +1634,11 @@ checksum = "a3e378b66a060d48947b590737b30a1be76706c8dd7b8ba0f2fe3989c68a853f"
 
 [[package]]
 name = "md-5"
-version = "0.9.1"
+version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b5a279bb9607f9f53c22d496eade00d138d1bdcccd07d74650387cf94942a15"
+checksum = "e6a38fc55c8bbc10058782919516f88826e70320db6d206aebc49611d24216ae"
 dependencies = [
- "block-buffer 0.9.0",
- "digest 0.9.0",
- "opaque-debug 0.3.0",
+ "digest 0.10.0",
 ]
 
 [[package]]
@@ -2270,7 +2307,7 @@ checksum = "d053368e1bae4c8a672953397bd1bd7183dde1c72b0b7612a15719173148d186"
 dependencies = [
  "ecdsa",
  "elliptic-curve",
- "sha2",
+ "sha2 0.9.8",
 ]
 
 [[package]]
@@ -2531,19 +2568,19 @@ dependencies = [
 
 [[package]]
 name = "postgres-protocol"
-version = "0.6.2"
+version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b145e6a4ed52cb316a27787fc20fe8a25221cb476479f61e4e0327c15b98d91a"
+checksum = "79ec03bce71f18b4a27c4c64c6ba2ddf74686d69b91d8714fb32ead3adaed713"
 dependencies = [
  "base64",
  "byteorder",
  "bytes",
  "fallible-iterator",
- "hmac",
+ "hmac 0.12.0",
  "md-5",
  "memchr",
  "rand",
- "sha2",
+ "sha2 0.10.0",
  "stringprep",
 ]
 
@@ -3403,6 +3440,17 @@ dependencies = [
  "opaque-debug 0.3.0",
 ]
 
+[[package]]
+name = "sha2"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "900d964dd36bb15bcf2f2b35694c072feab74969a54f2bbeec7a2d725d2bdcb6"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest 0.10.0",
+]
+
 [[package]]
 name = "sharded-slab"
 version = "0.1.4"
@@ -4510,7 +4558,7 @@ dependencies = [
  "serde",
  "serde-big-array",
  "serde_cbor",
- "sha2",
+ "sha2 0.9.8",
  "subtle",
  "zeroize",
 ]
diff --git a/test-utils/Cargo.toml b/test-utils/Cargo.toml
index ff5e9837b0f..e99dc31effd 100644
--- a/test-utils/Cargo.toml
+++ b/test-utils/Cargo.toml
@@ -9,7 +9,7 @@ anyhow = "1.0"
 futures = "0.3.18"
 libc = "0.2.109"
 omicron-common = { path = "../common" }
-postgres-protocol = "0.6.2"
+postgres-protocol = "0.6.3"
 signal-hook = "0.3"
 structopt = "0.3"
 subprocess = "0.2.8"