diff --git a/Cargo.lock b/Cargo.lock
index 8549ec4..a68a53b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -185,6 +185,15 @@ 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 = "bumpalo"
 version = "3.20.3"
@@ -285,6 +294,12 @@ 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 = "core-foundation-sys"
 version = "0.8.7"
@@ -300,6 +315,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "cpufeatures"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ca28b0ae3115b884660db4118d803791fd6756b6e88f39c0f3f7859060d7566"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "crc"
 version = "3.4.0"
@@ -340,13 +364,22 @@ 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 = "der"
 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",
 ]
@@ -357,12 +390,23 @@ 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 = "displaydoc"
 version = "0.2.7"
@@ -550,6 +594,18 @@ dependencies = [
  "wasi",
 ]
 
+[[package]]
+name = "getrandom"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "899def5c37c4fd7b2664648c28120ecec138e4d395b459e5ca34f9cce2dd77fd"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "r-efi",
+ "wasip2",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.15.5"
@@ -603,7 +659,7 @@ version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
 dependencies = [
- "digest",
+ "digest 0.10.7",
 ]
 
 [[package]]
@@ -660,6 +716,15 @@ version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "df3b46402a9d5adb4c86a0cf463f42e19994e3ee891101b1841f30a545cb49a9"
 
+[[package]]
+name = "hybrid-array"
+version = "0.4.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "27f864f10dfb56725ce5ce5472bc52252c8f93a4ab86327122cebf62c5f59a17"
+dependencies = [
+ "typenum",
+]
+
 [[package]]
 name = "hyper"
 version = "1.11.1"
@@ -942,7 +1007,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d89e7ee0cfbedfc4da3340218492196241d89eefb6dab27de5df917a6d2e78cf"
 dependencies = [
  "cfg-if",
- "digest",
+ "digest 0.10.7",
 ]
 
 [[package]]
@@ -1153,6 +1218,12 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "r-efi"
+version = "5.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "69cdb34c158ceb288df11e18b4bd39de994f6657d83847bdffdbd7f346754b0f"
+
 [[package]]
 name = "rand"
 version = "0.8.8"
@@ -1180,7 +1251,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom",
+ "getrandom 0.2.17",
 ]
 
 [[package]]
@@ -1226,7 +1297,7 @@ checksum = "a4689e6c2294d81e88dc6261c768b63bc4fcdb852be6d1352498b114f61383b7"
 dependencies = [
  "cc",
  "cfg-if",
- "getrandom",
+ "getrandom 0.2.17",
  "libc",
  "untrusted",
  "windows-sys 0.52.0",
@@ -1238,8 +1309,8 @@ 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",
@@ -1312,11 +1383,11 @@ dependencies = [
  "axum",
  "chrono",
  "clap",
+ "getrandom 0.3.4",
  "http-body-util",
- "rand",
  "serde",
  "serde_json",
- "sha2",
+ "sha2 0.11.0",
  "sqlx",
  "tokio",
  "tower",
@@ -1398,8 +1469,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a978451301f4db1d02937a4ab3ccce137717b81826e79b7d49ffe3244a13c3b8"
 dependencies = [
  "cfg-if",
- "cpufeatures",
- "digest",
+ "cpufeatures 0.2.17",
+ "digest 0.10.7",
 ]
 
 [[package]]
@@ -1409,8 +1480,19 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a7507d819769d01a365ab707794a4084392c824f54a7a6a7862f8c3d0892b283"
 dependencies = [
  "cfg-if",
- "cpufeatures",
- "digest",
+ "cpufeatures 0.2.17",
+ "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 0.3.1",
+ "digest 0.11.3",
 ]
 
 [[package]]
@@ -1444,7 +1526,7 @@ version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "77549399552de45a898a580c1b41d445bf730df867cc44e6c0233bbc4b8329de"
 dependencies = [
- "digest",
+ "digest 0.10.7",
  "rand_core",
 ]
 
@@ -1532,7 +1614,7 @@ dependencies = [
  "rustls",
  "serde",
  "serde_json",
- "sha2",
+ "sha2 0.10.9",
  "smallvec",
  "thiserror",
  "tokio",
@@ -1570,7 +1652,7 @@ dependencies = [
  "quote",
  "serde",
  "serde_json",
- "sha2",
+ "sha2 0.10.9",
  "sqlx-core",
  "sqlx-mysql",
  "sqlx-postgres",
@@ -1593,7 +1675,7 @@ dependencies = [
  "bytes",
  "chrono",
  "crc",
- "digest",
+ "digest 0.10.7",
  "dotenvy",
  "either",
  "futures-channel",
@@ -1614,7 +1696,7 @@ dependencies = [
  "rsa",
  "serde",
  "sha1",
- "sha2",
+ "sha2 0.10.9",
  "smallvec",
  "sqlx-core",
  "stringprep",
@@ -1652,7 +1734,7 @@ dependencies = [
  "rand",
  "serde",
  "serde_json",
- "sha2",
+ "sha2 0.10.9",
  "smallvec",
  "sqlx-core",
  "stringprep",
@@ -2044,6 +2126,15 @@ version = "0.11.1+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ccf3ec651a847eb01de73ccad15eb7d99f80485de043efb2f370cd654f4ea44b"
 
+[[package]]
+name = "wasip2"
+version = "1.0.4+wasi-0.2.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b67efb37e106e55ce722a510d6b5f9c17f083e5fc79afc2badeb12cc313d9487"
+dependencies = [
+ "wit-bindgen",
+]
+
 [[package]]
 name = "wasite"
 version = "0.1.0"
@@ -2330,6 +2421,12 @@ version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
 
+[[package]]
+name = "wit-bindgen"
+version = "0.57.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ebf944e87a7c253233ad6766e082e3cd714b5d03812acc24c318f549614536e"
+
 [[package]]
 name = "writeable"
 version = "0.6.4"
diff --git a/Cargo.toml b/Cargo.toml
index 0b32b27..3f79ad6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -33,12 +33,11 @@ chrono = { version = "0.4", features = ["serde"] }
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter", "json"] }
 anyhow = "1"
-sha2 = "0.10"
-# Key issuance needs a CSPRNG; `secrets.token_hex(16)` in the Python CLI.
-rand = "0.8"
+sha2 = "0.11"
 # The admin CLI (issue / show / revoke / suspend …) that replaced the
 # Python scripts.
 clap = { version = "4", features = ["derive", "env"] }
+getrandom = "0.3"
 
 [dev-dependencies]
 tower = { version = "0.5", features = ["util"] }
diff --git a/src/keys.rs b/src/keys.rs
index 0871cdc..3a04075 100644
--- a/src/keys.rs
+++ b/src/keys.rs
@@ -9,7 +9,6 @@
 //! The raw value is generated once, shown once by `issue`, and never
 //! persisted or logged.
 
-use rand::RngCore;
 use sha2::{Digest, Sha256};
 
 pub const KEY_PREFIX: &str = "slk_";
@@ -18,8 +17,12 @@ pub const KEY_PREFIX: &str = "slk_";
 /// `KEY_PREFIX + secrets.token_hex(16)`.
 pub fn generate_key() -> String {
     let mut bytes = [0u8; 16];
-    // OsRng, not a seeded PRNG — this is key material.
-    rand::rngs::OsRng.fill_bytes(&mut bytes);
+    // Straight from the OS CSPRNG. This used `rand::rngs::OsRng`, but
+    // rand 0.10 removed OsRng from that path entirely; rather than chase
+    // it across another rand reshuffle, `getrandom` is the thing rand was
+    // calling underneath anyway, and for key material the shorter, more
+    // obviously-correct call is the better dependency.
+    getrandom::fill(&mut bytes).expect("OS entropy is available");
     let hex: String = bytes.iter().map(|b| format!("{b:02x}")).collect();
     format!("{KEY_PREFIX}{hex}")
 }
@@ -27,7 +30,17 @@ pub fn generate_key() -> String {
 pub fn hash_key(raw_key: &str) -> String {
     let mut hasher = Sha256::new();
     hasher.update(raw_key.as_bytes());
-    format!("{:x}", hasher.finalize())
+    // Explicit hex rather than `format!("{:x}", ..)`: sha2 0.11 changed
+    // finalize() to return a type that no longer implements LowerHex.
+    //
+    // This function's output IS the stored key_hash. A silently different
+    // encoding would orphan every license row rather than fail a build,
+    // which is why the fixed vector below is a test and not a comment.
+    hasher
+        .finalize()
+        .iter()
+        .map(|b| format!("{b:02x}"))
+        .collect()
 }
 
 /// The last four characters, stored alongside the hash so an operator can