diff --git a/Cargo.lock b/Cargo.lock
index 60ec9765ed..592d478a34 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -24,17 +24,6 @@ version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "512761e0bb2578dd7380c6baaa0f4ce03e84f95e960231d1dec8bf4d7d6e2627"
 
-[[package]]
-name = "ahash"
-version = "0.7.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "891477e0c6a8957309ee5c45a6368af3ae14bb510732d2684ffa19af310920f9"
-dependencies = [
- "getrandom",
- "once_cell",
- "version_check",
-]
-
 [[package]]
 name = "ahash"
 version = "0.8.11"
@@ -1192,22 +1181,13 @@ dependencies = [
  "bitflags 2.6.0",
 ]
 
-[[package]]
-name = "hashbrown"
-version = "0.11.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ab5ef0d4909ef3724cc8cce6ccc8572c5c817592e9285f5464f8e86f8bd3726e"
-dependencies = [
- "ahash 0.7.8",
-]
-
 [[package]]
 name = "hashbrown"
 version = "0.14.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e5274423e17b7c9fc20b6e7e208532f9b19825d82dfd615708b70edd83df41f1"
 dependencies = [
- "ahash 0.8.11",
+ "ahash",
  "allocator-api2",
 ]
 
@@ -2163,22 +2143,23 @@ checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
 name = "rustc_codegen_spirv"
 version = "0.9.0"
 dependencies = [
+ "ahash",
  "ar",
+ "bytemuck",
  "either",
- "hashbrown 0.11.2",
  "indexmap",
  "itertools",
  "lazy_static",
  "libc",
- "num-traits",
+ "log",
  "object",
- "once_cell",
  "pipe",
  "pretty_assertions",
  "regex",
  "rspirv",
  "rustc-demangle",
  "rustc_codegen_spirv-types",
+ "rustix",
  "sanitize-filename",
  "smallvec",
  "spirt",
@@ -2224,8 +2205,10 @@ checksum = "f93dc38ecbab2eb790ff964bb77fa94faf256fd3e73285fd7ba0903b76bedb85"
 dependencies = [
  "bitflags 2.6.0",
  "errno",
+ "itoa",
  "libc",
  "linux-raw-sys",
+ "once_cell",
  "windows-sys 0.59.0",
 ]
 
@@ -3520,7 +3503,7 @@ version = "0.29.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0d59ad965a635657faf09c8f062badd885748428933dad8e8bdd64064d92e5ca"
 dependencies = [
- "ahash 0.8.11",
+ "ahash",
  "android-activity",
  "atomic-waker",
  "bitflags 2.6.0",
diff --git a/crates/rustc_codegen_spirv/Cargo.toml b/crates/rustc_codegen_spirv/Cargo.toml
index 5c42e1077b..0fdca9a155 100644
--- a/crates/rustc_codegen_spirv/Cargo.toml
+++ b/crates/rustc_codegen_spirv/Cargo.toml
@@ -33,11 +33,11 @@ skip-toolchain-check = []
 [dependencies]
 # HACK(eddyb) these only exist to unify features across dependency trees,
 # in order to avoid multiple separate instances of `rustc_codegen_spirv`.
-hashbrown = "0.11"
-libc = { version = "0.2", features = ["align", "extra_traits"] }
-num-traits = { workspace = true, default-features = true }
-once_cell = "1"
+ahash = { version = "0.8.11", features = ["no-rng"] }
+bytemuck = { version = "1.20.0", features = ["aarch64_simd", "derive"] }
+log = { version = "0.4.22", features = ["std"] }
 regex = { version = "1", features = ["perf"] }
+rustix = { version = "0.38.42", features = ["all-apis"] }
 
 # HACK(eddyb) deps of `rustc_codegen_ssa`, for `pqp_cg_ssa` (see `build.rs`),
 # that cannot be handled with just `extern crate` pulling out of the sysroot.
@@ -52,7 +52,7 @@ rspirv = "0.12"
 rustc_codegen_spirv-types.workspace = true
 rustc-demangle = "0.1.21"
 sanitize-filename = "0.4"
-smallvec = { version = "1.6.1", features = ["union"] }
+smallvec = { version = "1.6.1", features = ["const_generics", "const_new", "union"] }
 spirt = "0.4.0"
 spirv-tools.workspace = true
 lazy_static = "1.4.0"
@@ -66,6 +66,11 @@ pretty_assertions = "1.0"
 # (see `build.rs`).
 # tempfile = "3.4"
 
+# HACK(eddyb) deps of `rustc_codegen_ssa`, for `pqp_cg_ssa` (see `build.rs`),
+# that cannot be handled with just `extern crate` pulling out of the sysroot.
+[target.'cfg(unix)'.dependencies]
+libc = "0.2.50"
+
 # Note that in order to use RA and have access to `rustc_*` crates, you also
 # need to set `"rust-analyzer.rustcSource": "discover"` in e.g. VSCode.
 [package.metadata.rust-analyzer]
diff --git a/deny.toml b/deny.toml
index bbfdbf227c..f996cff704 100644
--- a/deny.toml
+++ b/deny.toml
@@ -30,6 +30,10 @@ skip = [
     # HACK(eddyb) two versions coexist for interop, for the time being.
     { name = "raw-window-handle", version = "=0.5.2" },
     { name = "raw-window-handle", version = "=0.6.2" },
+
+    # HACK(eddyb) the newer version hasn't propagated through the ecosystem yet.
+    { name = "hashbrown", version = "=0.14.5" },
+    { name = "hashbrown", version = "=0.15.2" },
 ]
 # Similarly to `skip` allows you to skip certain crates during duplicate
 # detection. Unlike skip, it also includes the entire tree of transitive
@@ -48,9 +52,6 @@ skip-tree = [
     # FIXME(eddyb) outdated `winit` version uses older `windows-*`,
     # requires an upgrade to `winit 0.30` to resolve.
     { name = "winit", version = "=0.29.15", depth = 4 },
-
-    # FIXME(eddyb) resolve everything hidden by this.
-    { name = "rustc_codegen_spirv", depth = 2 },
 ]