diff --git a/Cargo.lock b/Cargo.lock
index 7708a60..3370243 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -364,6 +364,15 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "block-buffer"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2f6c7dbe95a6ed67ad9f18e57daf93a2f034c524b99fd2b76d18fdfeb6660aa"
+dependencies = [
+ "hybrid-array",
+]
+
 [[package]]
 name = "block2"
 version = "0.6.2"
@@ -540,6 +549,12 @@ version = "0.9.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c2459377285ad874054d797f3ccebf984978aa39129f6eafde5cdc8315b612f8"
 
+[[package]]
+name = "const-oid"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a6ef517f0926dd24a1582492c791b6a4818a4d94e789a334894aa15b0d12f55c"
+
 [[package]]
 name = "const-random"
 version = "0.1.18"
@@ -683,6 +698,15 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "crypto-common"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce6e4c961d6cd6c9a86db418387425e8bdeaf05b3c8bc1411e6dca4c252f1453"
+dependencies = [
+ "hybrid-array",
+]
+
 [[package]]
 name = "darling"
 version = "0.21.3"
@@ -753,7 +777,7 @@ dependencies = [
  "serde-saphyr",
  "serde_json",
  "serial_test",
- "sha2",
+ "sha2 0.11.0",
  "sqlparser",
  "sqlx",
  "tempfile",
@@ -784,7 +808,7 @@ version = "0.7.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e7c1832837b905bbfb5101e07cc24c8deddf52f93225eee6ead5f4d63d53ddcb"
 dependencies = [
- "const-oid",
+ "const-oid 0.9.6",
  "pem-rfc7468",
  "zeroize",
 ]
@@ -849,12 +873,23 @@ version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
- "block-buffer",
- "const-oid",
- "crypto-common",
+ "block-buffer 0.10.4",
+ "const-oid 0.9.6",
+ "crypto-common 0.1.7",
  "subtle",
 ]
 
+[[package]]
+name = "digest"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1dd6dbb5841937940781866fa1281a1ff7bd3bf827091440879f9994983d5c2"
+dependencies = [
+ "block-buffer 0.12.1",
+ "const-oid 0.10.2",
+ "crypto-common 0.2.2",
+]
+
 [[package]]
 name = "dispatch2"
 version = "0.3.1"
@@ -1374,7 +1409,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest",
+ "digest 0.10.7",
 ]
 
 [[package]]
@@ -1442,6 +1477,15 @@ version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "df3b46402a9d5adb4c86a0cf463f42e19994e3ee891101b1841f30a545cb49a9"
 
+[[package]]
+name = "hybrid-array"
+version = "0.4.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "707114b52a152fa7bdb290cd7cd5912d9467273b6d74e21b8d81aca1f8533f6b"
+dependencies = [
+ "typenum",
+]
+
 [[package]]
 name = "hyper"
 version = "1.9.0"
@@ -1949,7 +1993,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d89e7ee0cfbedfc4da3340218492196241d89eefb6dab27de5df917a6d2e78cf"
 dependencies = [
  "cfg-if",
- "digest",
+ "digest 0.10.7",
 ]
 
 [[package]]
@@ -2093,7 +2137,7 @@ dependencies = [
  "serde_bytes",
  "serde_with",
  "sha1",
- "sha2",
+ "sha2 0.10.9",
  "socket2",
  "stringprep",
  "strsim",
@@ -2455,7 +2499,7 @@ version = "0.12.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f8ed6a7761f76e3b9f92dfb0a60a6a6477c61024b775147ff0973a02653abaf2"
 dependencies = [
- "digest",
+ "digest 0.10.7",
 ]
 
 [[package]]
@@ -2981,8 +3025,8 @@ version = "0.9.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b8573f03f5883dcaebdfcf4725caa1ecb9c15b2ef50c43a07b816e06799bb12d"
 dependencies = [
- "const-oid",
- "digest",
+ "const-oid 0.9.6",
+ "digest 0.10.7",
  "num-bigint-dig",
  "num-integer",
  "num-traits",
@@ -3463,7 +3507,7 @@ checksum = "e3bf829a2d51ab4a5ddf1352d8470c140cadc8301b2ae1789db023f01cedd6ba"
 dependencies = [
  "cfg-if",
  "cpufeatures 0.2.17",
- "digest",
+ "digest 0.10.7",
 ]
 
 [[package]]
@@ -3474,7 +3518,18 @@ checksum = "a7507d819769d01a365ab707794a4084392c824f54a7a6a7862f8c3d0892b283"
 dependencies = [
  "cfg-if",
  "cpufeatures 0.2.17",
- "digest",
+ "digest 0.10.7",
+]
+
+[[package]]
+name = "sha2"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "446ba717509524cb3f22f17ecc096f10f4822d76ab5c0b9822c5f9c284e825f4"
+dependencies = [
+ "cfg-if",
+ "cpufeatures 0.3.0",
+ "digest 0.11.3",
 ]
 
 [[package]]
@@ -3508,7 +3563,7 @@ version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "77549399552de45a898a580c1b41d445bf730df867cc44e6c0233bbc4b8329de"
 dependencies = [
- "digest",
+ "digest 0.10.7",
  "rand_core 0.6.4",
 ]
 
@@ -3652,7 +3707,7 @@ dependencies = [
  "rustls",
  "serde",
  "serde_json",
- "sha2",
+ "sha2 0.10.9",
  "smallvec",
  "thiserror",
  "tokio",
@@ -3691,7 +3746,7 @@ dependencies = [
  "quote",
  "serde",
  "serde_json",
- "sha2",
+ "sha2 0.10.9",
  "sqlx-core",
  "sqlx-mysql",
  "sqlx-postgres",
@@ -3715,7 +3770,7 @@ dependencies = [
  "bytes",
  "chrono",
  "crc",
- "digest",
+ "digest 0.10.7",
  "dotenvy",
  "either",
  "futures-channel",
@@ -3736,7 +3791,7 @@ dependencies = [
  "rsa",
  "serde",
  "sha1",
- "sha2",
+ "sha2 0.10.9",
  "smallvec",
  "sqlx-core",
  "stringprep",
@@ -3777,7 +3832,7 @@ dependencies = [
  "rand 0.8.6",
  "serde",
  "serde_json",
- "sha2",
+ "sha2 0.10.9",
  "smallvec",
  "sqlx-core",
  "stringprep",
diff --git a/Cargo.toml b/Cargo.toml
index 5307bc6..b9efabc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -60,7 +60,7 @@ reqwest = { version = "0.12", default-features = false, features = ["json", "rus
 url = "2"
 # PKCE S256 for the MCP OAuth bridge: base64url-no-pad(sha256(verifier))
 # compared against the client's code_challenge.
-sha2 = "0.10"
+sha2 = "0.11"
 base64 = "0.22"
 # DB-credential hygiene: keep resolved passwords in a heap buffer that zeroes
 # on drop and refuses to `Debug`-print in the clear. `secrecy::SecretString`