diff --git a/pkgs/build-support/build-mozilla-mach/153-cbindgen-0.29.4-compat.patch b/pkgs/build-support/build-mozilla-mach/153-cbindgen-0.29.4-compat.patch
new file mode 100644
index 0000000000000..84238f025fc6c
--- /dev/null
+++ b/pkgs/build-support/build-mozilla-mach/153-cbindgen-0.29.4-compat.patch
@@ -0,0 +1,36 @@
+commit c4aab1ba6aadd6985fcd271679d2118f094ec876
+Author: Emilio Cobos Álvarez <emilio@crisal.io>
+Date:   Tue Jun 9 22:04:44 2026 +0000
+
+    Bug 2046162 - Remove some redundant pub qualifiers. r=gfx-reviewers,aosmond
+    
+    The enum is not public so this doesn't change behavior but a patch I'm
+    working on in cbindgen gets a bit confused with this.
+    
+    Differential Revision: https://phabricator.services.mozilla.com/D305678
+
+diff --git a/gfx/wr/webrender/src/texture_cache.rs b/gfx/wr/webrender/src/texture_cache.rs
+index e14c26bd3190..77e1f3a312ac 100644
+--- a/gfx/wr/webrender/src/texture_cache.rs
++++ b/gfx/wr/webrender/src/texture_cache.rs
+@@ -273,9 +273,9 @@ enum BudgetType {
+ }
+ 
+ impl BudgetType {
+-    pub const COUNT: usize = 7;
++    const COUNT: usize = 7;
+ 
+-    pub const VALUES: [BudgetType; BudgetType::COUNT] = [
++    const VALUES: [BudgetType; BudgetType::COUNT] = [
+         BudgetType::SharedColor8Linear,
+         BudgetType::SharedColor8Nearest,
+         BudgetType::SharedColor8Glyphs,
+@@ -285,7 +285,7 @@ impl BudgetType {
+         BudgetType::Standalone,
+     ];
+ 
+-    pub const PRESSURE_COUNTERS: [usize; BudgetType::COUNT] = [
++    const PRESSURE_COUNTERS: [usize; BudgetType::COUNT] = [
+         profiler::ATLAS_COLOR8_LINEAR_PRESSURE,
+         profiler::ATLAS_COLOR8_NEAREST_PRESSURE,
+         profiler::ATLAS_COLOR8_GLYPHS_PRESSURE,
diff --git a/pkgs/build-support/build-mozilla-mach/default.nix b/pkgs/build-support/build-mozilla-mach/default.nix
index d6fce120abb74..cee18f7439ef0 100644
--- a/pkgs/build-support/build-mozilla-mach/default.nix
+++ b/pkgs/build-support/build-mozilla-mach/default.nix
@@ -341,6 +341,11 @@ buildStdenv.mkDerivation {
       # https://bugzilla.mozilla.org/show_bug.cgi?id=1985509
       ./140-bindgen-string-view.patch
     ]
+    ++ lib.optionals (lib.versionAtLeast version "140" && lib.versionOlder version "140.13") [
+      # https://github.com/mozilla/cbindgen/issues/1165
+      # https://bugzilla.mozilla.org/show_bug.cgi?id=2046162
+      ./153-cbindgen-0.29.4-compat.patch
+    ]
     ++ extraPatches;
 
   postPatch = ''
diff --git a/pkgs/by-name/ru/rust-cbindgen/package.nix b/pkgs/by-name/ru/rust-cbindgen/package.nix
index 88bb855e800b0..c6e5427f80c2f 100644
--- a/pkgs/by-name/ru/rust-cbindgen/package.nix
+++ b/pkgs/by-name/ru/rust-cbindgen/package.nix
@@ -14,16 +14,16 @@
 
 rustPlatform.buildRustPackage (finalAttrs: {
   pname = "rust-cbindgen";
-  version = "0.29.3";
+  version = "0.29.4";
 
   src = fetchFromGitHub {
     owner = "mozilla";
     repo = "cbindgen";
     rev = "v${finalAttrs.version}";
-    hash = "sha256-d0rY7Sk37s8HEZlQq9Sbjj1P+DgygD0Yjx8cXlFKEIA=";
+    hash = "sha256-leeHOwpzXuzg2cTjXehBnCsS+dvU4eIIFtWKeCee20U=";
   };
 
-  cargoHash = "sha256-UeierkQpfCiB5ES9ZW9hO+0AcI9Ip8qSJ/Nd+I1xrmQ=";
+  cargoHash = "sha256-f6YoDoiVoh0BVPYHFO1FsdI4OCsF+LY72QaD57StdIQ=";
 
   nativeCheckInputs = [
     cmake