diff --git a/Cargo.lock b/Cargo.lock
index 3167399..b116fab 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -151,25 +151,42 @@ dependencies = [
 
 [[package]]
 name = "cargo-platform"
-version = "0.1.9"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "84982c6c0ae343635a3a4ee6dedef965513735c8b183caa7289fa6e27399ebd4"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "cargo-util-schemas"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e35af189006b9c0f00a064685c727031e3ed2d8020f7ba284d78cc2671bd36ea"
+checksum = "e63d2780ac94487eb9f1fea7b0d56300abc9eb488800854ca217f102f5caccca"
 dependencies = [
+ "semver",
  "serde",
+ "serde-untagged",
+ "serde-value",
+ "thiserror 1.0.69",
+ "toml",
+ "unicode-xid",
+ "url",
 ]
 
 [[package]]
 name = "cargo_metadata"
-version = "0.19.2"
+version = "0.20.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd5eb614ed4c27c5d706420e4320fbe3216ab31fa1c33cd8246ac36dae4479ba"
+checksum = "4f7835cfc6135093070e95eb2b53e5d9b5c403dc3a6be6040ee026270aa82502"
 dependencies = [
  "camino",
  "cargo-platform",
+ "cargo-util-schemas",
  "semver",
  "serde",
  "serde_json",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -365,6 +382,16 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
 
+[[package]]
+name = "erased-serde"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e004d887f51fcb9fef17317a2f3525c887d8aa3f4f50fed920816a688284a5b7"
+dependencies = [
+ "serde",
+ "typeid",
+]
+
 [[package]]
 name = "errno"
 version = "0.3.12"
@@ -571,7 +598,7 @@ dependencies = [
  "gix-worktree",
  "once_cell",
  "smallvec",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -584,7 +611,7 @@ dependencies = [
  "gix-date",
  "gix-utils",
  "itoa",
- "thiserror",
+ "thiserror 2.0.12",
  "winnow",
 ]
 
@@ -601,7 +628,7 @@ dependencies = [
  "gix-trace",
  "kstring",
  "smallvec",
- "thiserror",
+ "thiserror 2.0.12",
  "unicode-bom",
 ]
 
@@ -611,7 +638,7 @@ version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b1db9765c69502650da68f0804e3dc2b5f8ccc6a2d104ca6c85bc40700d37540"
 dependencies = [
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -620,7 +647,7 @@ version = "0.4.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b1f1d8764958699dc764e3f727cef280ff4d1bd92c107bbf8acd85b30c1bd6f"
 dependencies = [
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -646,7 +673,7 @@ dependencies = [
  "gix-chunk",
  "gix-hash",
  "memmap2",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -665,7 +692,7 @@ dependencies = [
  "memchr",
  "once_cell",
  "smallvec",
- "thiserror",
+ "thiserror 2.0.12",
  "unicode-bom",
  "winnow",
 ]
@@ -680,7 +707,7 @@ dependencies = [
  "bstr",
  "gix-path",
  "libc",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -697,7 +724,7 @@ dependencies = [
  "gix-sec",
  "gix-trace",
  "gix-url",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -710,7 +737,7 @@ dependencies = [
  "itoa",
  "jiff",
  "smallvec",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -722,7 +749,7 @@ dependencies = [
  "bstr",
  "gix-hash",
  "gix-object",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -738,7 +765,7 @@ dependencies = [
  "gix-path",
  "gix-ref",
  "gix-sec",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -756,7 +783,7 @@ dependencies = [
  "libc",
  "once_cell",
  "prodash",
- "thiserror",
+ "thiserror 2.0.12",
  "walkdir",
 ]
 
@@ -778,7 +805,7 @@ dependencies = [
  "gix-trace",
  "gix-utils",
  "smallvec",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -792,7 +819,7 @@ dependencies = [
  "gix-features",
  "gix-path",
  "gix-utils",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -816,7 +843,7 @@ dependencies = [
  "faster-hex",
  "gix-features",
  "sha1-checked",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -868,7 +895,7 @@ dependencies = [
  "memmap2",
  "rustix",
  "smallvec",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -879,7 +906,7 @@ checksum = "570f8b034659f256366dc90f1a24924902f20acccd6a15be96d44d1269e7a796"
 dependencies = [
  "gix-tempfile",
  "gix-utils",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -895,7 +922,7 @@ dependencies = [
  "gix-object",
  "gix-revwalk",
  "smallvec",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -915,7 +942,7 @@ dependencies = [
  "gix-validate",
  "itoa",
  "smallvec",
- "thiserror",
+ "thiserror 2.0.12",
  "winnow",
 ]
 
@@ -937,7 +964,7 @@ dependencies = [
  "gix-quote",
  "parking_lot",
  "tempfile",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -957,7 +984,7 @@ dependencies = [
  "memmap2",
  "parking_lot",
  "smallvec",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -969,7 +996,7 @@ dependencies = [
  "bstr",
  "faster-hex",
  "gix-trace",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -981,7 +1008,7 @@ dependencies = [
  "bstr",
  "faster-hex",
  "gix-trace",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -995,7 +1022,7 @@ dependencies = [
  "gix-validate",
  "home",
  "once_cell",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -1010,7 +1037,7 @@ dependencies = [
  "gix-config-value",
  "gix-glob",
  "gix-path",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -1023,7 +1050,7 @@ dependencies = [
  "gix-config-value",
  "parking_lot",
  "rustix",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -1048,7 +1075,7 @@ dependencies = [
  "gix-transport",
  "gix-utils",
  "maybe-async",
- "thiserror",
+ "thiserror 2.0.12",
  "winnow",
 ]
 
@@ -1060,7 +1087,7 @@ checksum = "4a375a75b4d663e8bafe3bf4940a18a23755644c13582fa326e99f8f987d83fd"
 dependencies = [
  "bstr",
  "gix-utils",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -1080,7 +1107,7 @@ dependencies = [
  "gix-utils",
  "gix-validate",
  "memmap2",
- "thiserror",
+ "thiserror 2.0.12",
  "winnow",
 ]
 
@@ -1095,7 +1122,7 @@ dependencies = [
  "gix-revision",
  "gix-validate",
  "smallvec",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -1110,7 +1137,7 @@ dependencies = [
  "gix-hash",
  "gix-object",
  "gix-revwalk",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -1125,7 +1152,7 @@ dependencies = [
  "gix-hashtable",
  "gix-object",
  "smallvec",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -1149,7 +1176,7 @@ dependencies = [
  "bstr",
  "gix-hash",
  "gix-lock",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -1164,7 +1191,7 @@ dependencies = [
  "gix-pathspec",
  "gix-refspec",
  "gix-url",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -1203,7 +1230,7 @@ dependencies = [
  "gix-sec",
  "gix-url",
  "reqwest",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -1220,7 +1247,7 @@ dependencies = [
  "gix-object",
  "gix-revwalk",
  "smallvec",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -1233,7 +1260,7 @@ dependencies = [
  "gix-features",
  "gix-path",
  "percent-encoding",
- "thiserror",
+ "thiserror 2.0.12",
  "url",
 ]
 
@@ -1254,7 +1281,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "77b9e00cacde5b51388d28ed746c493b18a6add1f19b5e01d686b3b9ece66d4d"
 dependencies = [
  "bstr",
- "thiserror",
+ "thiserror 2.0.12",
 ]
 
 [[package]]
@@ -1751,6 +1778,15 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "num-traits"
+version = "0.2.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "object"
 version = "0.36.7"
@@ -1784,6 +1820,15 @@ dependencies = [
  "vcpkg",
 ]
 
+[[package]]
+name = "ordered-float"
+version = "2.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68f19d67e5a2795c94e73e0bb1cc1a7edeb2e28efd39e2e1c9b7a40c1108b11c"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "parking_lot"
 version = "0.12.3"
@@ -1897,7 +1942,7 @@ dependencies = [
  "rustc-hash",
  "rustls",
  "socket2",
- "thiserror",
+ "thiserror 2.0.12",
  "tokio",
  "tracing",
  "web-time",
@@ -1918,7 +1963,7 @@ dependencies = [
  "rustls",
  "rustls-pki-types",
  "slab",
- "thiserror",
+ "thiserror 2.0.12",
  "tinyvec",
  "tracing",
  "web-time",
@@ -2245,6 +2290,27 @@ dependencies = [
  "serde_derive",
 ]
 
+[[package]]
+name = "serde-untagged"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "299d9c19d7d466db4ab10addd5703e4c615dec2a5a16dbbafe191045e87ee66e"
+dependencies = [
+ "erased-serde",
+ "serde",
+ "typeid",
+]
+
+[[package]]
+name = "serde-value"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3a1a3341211875ef120e117ea7fd5228530ae7e7036a779fdc9117be6b3282c"
+dependencies = [
+ "ordered-float",
+ "serde",
+]
+
 [[package]]
 name = "serde_derive"
 version = "1.0.219"
@@ -2268,6 +2334,15 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_spanned"
+version = "0.6.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bf41e0cfaf7226dca15e8197172c295a782857fcb97fad1808a166870dee75a3"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "serde_urlencoded"
 version = "0.7.1"
@@ -2451,7 +2526,7 @@ dependencies = [
  "sha2",
  "smol_str",
  "tempfile",
- "thiserror",
+ "thiserror 2.0.12",
  "tiny-bench",
  "tokio",
  "toml-span",
@@ -2471,13 +2546,33 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
+[[package]]
+name = "thiserror"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6aaf5339b578ea85b50e080feb250a3e8ae8cfcdff9a461c9ec2904bc923f52"
+dependencies = [
+ "thiserror-impl 1.0.69",
+]
+
 [[package]]
 name = "thiserror"
 version = "2.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "567b8a2dae586314f7be2a752ec7474332959c6460e02bde30d702a66d488708"
 dependencies = [
- "thiserror-impl",
+ "thiserror-impl 2.0.12",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4fee6c4efc90059e10f81e6d42c60a18f76588c3d74cb83a0b242a2b6c7504c1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
 ]
 
 [[package]]
@@ -2560,6 +2655,18 @@ dependencies = [
  "tokio",
 ]
 
+[[package]]
+name = "toml"
+version = "0.8.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc1beb996b9d83529a9e75c17a1686767d148d70663143c7854d8b4a09ced362"
+dependencies = [
+ "serde",
+ "serde_spanned",
+ "toml_datetime",
+ "toml_edit",
+]
+
 [[package]]
 name = "toml-span"
 version = "0.5.1"
@@ -2569,6 +2676,35 @@ dependencies = [
  "smallvec",
 ]
 
+[[package]]
+name = "toml_datetime"
+version = "0.6.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22cddaf88f4fbc13c51aebbf5f8eceb5c7c5a9da2ac40a13519eb5b0a0e8f11c"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "toml_edit"
+version = "0.22.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41fe8c660ae4257887cf66394862d21dbca4a6ddd26f04a3560410406a2f819a"
+dependencies = [
+ "indexmap",
+ "serde",
+ "serde_spanned",
+ "toml_datetime",
+ "toml_write",
+ "winnow",
+]
+
+[[package]]
+name = "toml_write"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d99f8c9a7727884afe522e9bd5edbfc91a3312b36a77b5fb8926e4c31a41801"
+
 [[package]]
 name = "tower"
 version = "0.5.2"
@@ -2627,6 +2763,12 @@ version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e7b17f197b3050ba473acf9181f7b1d3b66d1cf7356c6cc57886662276e65908"
 
+[[package]]
+name = "typeid"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bc7d623258602320d5c55d1bc22793b57daff0ec7efc270ea7d55ce1d5f5471c"
+
 [[package]]
 name = "typenum"
 version = "1.18.0"
@@ -2654,6 +2796,12 @@ dependencies = [
  "tinyvec",
 ]
 
+[[package]]
+name = "unicode-xid"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ebc1c04c71510c7f702b52b7c350734c9ff1295c464a03335b00bb84fc54f853"
+
 [[package]]
 name = "untrusted"
 version = "0.9.0"
diff --git a/Cargo.toml b/Cargo.toml
index e881562..8bb351d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -85,7 +85,7 @@ features = ["blocking", "gzip", "http2"]
 libc = "0.2"
 
 [dev-dependencies]
-cargo_metadata = "0.19"
+cargo_metadata = "0.20"
 rayon = "1.7"
 tempfile = "3.15"
 tiny-bench = "0.4"
diff --git a/src/index.rs b/src/index.rs
index 85b5050..af0e210 100644
--- a/src/index.rs
+++ b/src/index.rs
@@ -33,15 +33,17 @@ pub use crate::utils::flock::FileLock;
 
 /// Global configuration of an index, reflecting the [contents of config.json](https://doc.rust-lang.org/cargo/reference/registries.html#index-format).
 #[derive(Eq, PartialEq, PartialOrd, Ord, Clone, Debug, serde::Deserialize, serde::Serialize)]
-#[serde(rename_all = "kebab-case")]
 pub struct IndexConfig {
     /// Pattern for creating download URLs. See [`Self::download_url`].
     pub dl: String,
     #[serde(default)]
     /// Base URL for publishing, etc.
     pub api: Option<String>,
-    #[serde(default)]
-    auth_required: bool,
+    /// Indicates whether this is a private registry that requires all
+    /// operations to be authenticated including API requests, crate downloads
+    /// and sparse index updates.
+    #[serde(default, rename = "auth-required")]
+    pub auth_required: bool,
 }
 
 impl IndexConfig {
diff --git a/tests/local.rs b/tests/local.rs
index 2ce24e3..2748aa3 100644
--- a/tests/local.rs
+++ b/tests/local.rs
@@ -31,7 +31,7 @@ fn builds_local_registry() {
     let lock = tame_index::utils::flock::FileLock::unlocked();
 
     for pkg in &md.packages {
-        if pkg.name == "tame-index" {
+        if pkg.name.as_ref() == "tame-index" {
             continue;
         }
         let ip = krates.entry(pkg.name.clone()).or_insert_with(|| {