diff --git a/docs/resources/changelog.md b/docs/resources/changelog.md
index 8d79973c97..c53ffa98ac 100644
--- a/docs/resources/changelog.md
+++ b/docs/resources/changelog.md
@@ -67,6 +67,7 @@ New versions of Shoelace are released as-needed and generally occur when a criti
 - Moved all component descriptions to `@summary` to get them within documentation tools [#962](https://github.com/shoelace-style/shoelace/pull/962)
 - Refactored form controls to use the `ShoelaceFormControl` interface to improve type safety and consistency
 - Updated Lit to 2.4.1
+- Updated `@shoelace-style/localize` t0 3.0.3 to support for extended language codes
 - Updated Bootstrap Icons to 1.10.2
 - Updated TypeScript to 4.8.4
 - Updated esbuild to 0.15.14
diff --git a/package-lock.json b/package-lock.json
index 5d996546b8..b056d2087b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,7 @@
         "@floating-ui/dom": "^1.0.6",
         "@lit-labs/react": "^1.1.0",
         "@shoelace-style/animations": "^1.1.0",
-        "@shoelace-style/localize": "^3.0.1",
+        "@shoelace-style/localize": "^3.0.3",
         "color": "4.2",
         "lit": "^2.4.1",
         "qr-creator": "^1.0.0"
@@ -1144,9 +1144,9 @@
       }
     },
     "node_modules/@shoelace-style/localize": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/@shoelace-style/localize/-/localize-3.0.1.tgz",
-      "integrity": "sha512-nmv1syJ3ormbGq29GsuxGRK6BFq7Jhx+kVFyuuozz0Pckkvk1SGk2vpZZcdnj2vRZCETvlVB7KYgakUwgGmn+A=="
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/@shoelace-style/localize/-/localize-3.0.3.tgz",
+      "integrity": "sha512-BVYDsMTpSCjvC8akhTkcnl4WIgAv7AnRq8fSuNhdGDLjkpmN1ARdAXic5luAozoMVjft85ocOmEdT8z7MbXdmQ=="
     },
     "node_modules/@sindresorhus/is": {
       "version": "0.7.0",
@@ -16061,9 +16061,9 @@
       "integrity": "sha512-Be+cahtZyI2dPKRm8EZSx3YJQ+jLvEcn3xzRP7tM4tqBnvd/eW/64Xh0iOf0t2w5P8iJKfdBbpVNE9naCaOf2g=="
     },
     "@shoelace-style/localize": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/@shoelace-style/localize/-/localize-3.0.1.tgz",
-      "integrity": "sha512-nmv1syJ3ormbGq29GsuxGRK6BFq7Jhx+kVFyuuozz0Pckkvk1SGk2vpZZcdnj2vRZCETvlVB7KYgakUwgGmn+A=="
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/@shoelace-style/localize/-/localize-3.0.3.tgz",
+      "integrity": "sha512-BVYDsMTpSCjvC8akhTkcnl4WIgAv7AnRq8fSuNhdGDLjkpmN1ARdAXic5luAozoMVjft85ocOmEdT8z7MbXdmQ=="
     },
     "@sindresorhus/is": {
       "version": "0.7.0",
diff --git a/package.json b/package.json
index 12af9d2ee0..7d00d14ed9 100644
--- a/package.json
+++ b/package.json
@@ -59,7 +59,7 @@
     "@floating-ui/dom": "^1.0.6",
     "@lit-labs/react": "^1.1.0",
     "@shoelace-style/animations": "^1.1.0",
-    "@shoelace-style/localize": "^3.0.1",
+    "@shoelace-style/localize": "^3.0.3",
     "color": "4.2",
     "lit": "^2.4.1",
     "qr-creator": "^1.0.0"