diff --git a/Cargo.lock b/Cargo.lock
index 3213cce4..27094aa1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -8,6 +8,19 @@ version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "320119579fcad9c21884f5c4861d16174d0e06250625266f50fe6898340abefa"
 
+[[package]]
+name = "ahash"
+version = "0.8.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a15f179cd60c4584b8a8c596927aadc462e27f2ca70c04e0071964a73ba7a75"
+dependencies = [
+ "cfg-if",
+ "getrandom 0.3.4",
+ "once_cell",
+ "version_check",
+ "zerocopy",
+]
+
 [[package]]
 name = "aho-corasick"
 version = "1.1.5"
@@ -47,6 +60,17 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "annotate-snippets"
+version = "0.12.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f211a51805bc641f3ad5b7664c77d2547af685cc33b4cd8d31964027a46f13f1"
+dependencies = [
+ "anstyle",
+ "memchr",
+ "unicode-width",
+]
+
 [[package]]
 name = "anstream"
 version = "1.0.0"
@@ -118,6 +142,12 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "03918c3dbd7701a85c6b9887732e2921175f26c350b4563841d0958c21d57e6d"
 
+[[package]]
+name = "arraydeque"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7d902e3d592a523def97af8f317b08ce16b7ab854c1985a0c671e6f15cebc236"
+
 [[package]]
 name = "asn1-rs"
 version = "0.7.2"
@@ -1004,6 +1034,15 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "encoding_rs_io"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fba3fe847045ecff794b9c138293a80db914678c453ad63fbf0c6a9eb6e00b22"
+dependencies = [
+ "encoding_rs",
+]
+
 [[package]]
 name = "envy"
 version = "0.4.2"
@@ -1278,9 +1317,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "899def5c37c4fd7b2664648c28120ecec138e4d395b459e5ca34f9cce2dd77fd"
 dependencies = [
  "cfg-if",
+ "js-sys",
  "libc",
  "r-efi 5.3.0",
  "wasip2",
+ "wasm-bindgen",
 ]
 
 [[package]]
@@ -1327,6 +1368,16 @@ dependencies = [
  "walkdir",
 ]
 
+[[package]]
+name = "granit-parser"
+version = "0.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d03f81ad4732830d85cfd417a9f62cde6dadda4354d37d078a6084a19560aa2d"
+dependencies = [
+ "arraydeque",
+ "smallvec",
+]
+
 [[package]]
 name = "h2"
 version = "0.4.15"
@@ -2118,6 +2169,12 @@ dependencies = [
  "vcpkg",
 ]
 
+[[package]]
+name = "nohash-hasher"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2bf50223579dc7cdcfb3bfcacf7069ff68243f8c363f62ffa99cf000a6b9c451"
+
 [[package]]
 name = "nom"
 version = "7.1.3"
@@ -2970,12 +3027,11 @@ dependencies = [
 
 [[package]]
 name = "rust-i18n"
-version = "3.1.5"
+version = "4.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fda2551fdfaf6cc5ee283adc15e157047b92ae6535cf80f6d4962d05717dc332"
+checksum = "f10cee36dd3b1f7929ea12b759de9eea9eff83bfccbc71f387ef4d41a57c64a4"
 dependencies = [
  "globwalk",
- "once_cell",
  "regex",
  "rust-i18n-macro",
  "rust-i18n-support",
@@ -2984,39 +3040,33 @@ dependencies = [
 
 [[package]]
 name = "rust-i18n-macro"
-version = "3.1.5"
+version = "4.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "22baf7d7f56656d23ebe24f6bb57a5d40d2bce2a5f1c503e692b5b2fa450f965"
+checksum = "f0bb1ed4e04fe26c2a2652cad1c6595efaf7196f4445c0d6e13c67154347fb7e"
 dependencies = [
  "glob",
- "once_cell",
  "proc-macro2",
  "quote",
  "rust-i18n-support",
  "serde",
  "serde_json",
- "serde_yaml",
  "syn 2.0.119",
 ]
 
 [[package]]
 name = "rust-i18n-support"
-version = "3.1.5"
+version = "4.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "940ed4f52bba4c0152056d771e563b7133ad9607d4384af016a134b58d758f19"
+checksum = "ba1c083408a2733180ae0acf2897612f8ceec7b0c0dcd065a0a87103bfb3b1d9"
 dependencies = [
  "arc-swap",
  "base62",
  "globwalk",
  "itertools 0.11.0",
- "lazy_static",
  "normpath",
- "once_cell",
- "proc-macro2",
- "regex",
  "serde",
+ "serde-saphyr",
  "serde_json",
- "serde_yaml",
  "siphasher",
  "toml 0.8.23",
  "triomphe",
@@ -3495,6 +3545,25 @@ dependencies = [
  "serde_derive",
 ]
 
+[[package]]
+name = "serde-saphyr"
+version = "0.0.29"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7bd22781911de0ca6debda95f073c8f18bec65d1a94f1fa9573f3102e514cea4"
+dependencies = [
+ "ahash",
+ "annotate-snippets",
+ "base64",
+ "encoding_rs_io",
+ "getrandom 0.3.4",
+ "granit-parser",
+ "nohash-hasher",
+ "num-traits",
+ "serde_core",
+ "smallvec",
+ "zmij",
+]
+
 [[package]]
 name = "serde_core"
 version = "1.0.229"
diff --git a/crates/rustapi-validate/Cargo.toml b/crates/rustapi-validate/Cargo.toml
index fc9d62fd..03fe86b1 100644
--- a/crates/rustapi-validate/Cargo.toml
+++ b/crates/rustapi-validate/Cargo.toml
@@ -26,7 +26,7 @@ async-trait = { workspace = true }
 regex = "1.10"
 
 # Internationalization (optional — English fallbacks ship without this)
-rust-i18n = { version = "3.0", optional = true }
+rust-i18n = { version = "4.2", optional = true }
 
 # Re-export derive macro
 rustapi-macros = { workspace = true }