diff --git a/CHANGELOG.md b/CHANGELOG.md
index 762f376..aacb671 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,8 +8,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Validate `hreflang` on links and assets.
+
 ### Changed
 
+- Update the examples to STAC 1.1.0.
+
 ### Deprecated
 
 ### Removed
diff --git a/examples/ar/catalog.json b/examples/ar/catalog.json
index cbdaa75..055fb8e 100644
--- a/examples/ar/catalog.json
+++ b/examples/ar/catalog.json
@@ -1,5 +1,5 @@
 {
-  "stac_version": "1.0.0",
+  "stac_version": "1.1.0",
   "stac_extensions": [
     "https://stac-extensions.github.io/language/v1.0.0/schema.json"
   ],
@@ -73,4 +73,4 @@
       "hreflang": "en-US"
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/examples/ar/item.json b/examples/ar/item.json
index d1deac9..6c47ee8 100644
--- a/examples/ar/item.json
+++ b/examples/ar/item.json
@@ -1,5 +1,5 @@
 {
-  "stac_version": "1.0.0",
+  "stac_version": "1.1.0",
   "stac_extensions": [
     "https://stac-extensions.github.io/language/v1.0.0/schema.json"
   ],
diff --git a/examples/catalog.json b/examples/catalog.json
index 9674022..99b6321 100644
--- a/examples/catalog.json
+++ b/examples/catalog.json
@@ -1,5 +1,5 @@
 {
-  "stac_version": "1.0.0",
+  "stac_version": "1.1.0",
   "stac_extensions": [
     "https://stac-extensions.github.io/language/v1.0.0/schema.json"
   ],
@@ -73,4 +73,4 @@
       "hreflang": "en-US"
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/examples/de/catalog.json b/examples/de/catalog.json
index d9abee0..9c09cd5 100644
--- a/examples/de/catalog.json
+++ b/examples/de/catalog.json
@@ -1,5 +1,5 @@
 {
-  "stac_version": "1.0.0",
+  "stac_version": "1.1.0",
   "stac_extensions": [
     "https://stac-extensions.github.io/language/v1.0.0/schema.json"
   ],
@@ -73,4 +73,4 @@
       "hreflang": "en-US"
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/examples/de/item.json b/examples/de/item.json
index 14500fe..1e327d3 100644
--- a/examples/de/item.json
+++ b/examples/de/item.json
@@ -1,5 +1,5 @@
 {
-  "stac_version": "1.0.0",
+  "stac_version": "1.1.0",
   "stac_extensions": [
     "https://stac-extensions.github.io/language/v1.0.0/schema.json"
   ],
@@ -105,4 +105,4 @@
       "hreflang": "de"
     }
   }
-}
\ No newline at end of file
+}
diff --git a/examples/item.json b/examples/item.json
index 540d9d1..a690d03 100644
--- a/examples/item.json
+++ b/examples/item.json
@@ -1,5 +1,5 @@
 {
-  "stac_version": "1.0.0",
+  "stac_version": "1.1.0",
   "stac_extensions": [
     "https://stac-extensions.github.io/language/v1.0.0/schema.json"
   ],
diff --git a/package.json b/package.json
index 3defabd..0bd207d 100644
--- a/package.json
+++ b/package.json
@@ -2,12 +2,14 @@
   "name": "stac-extensions",
   "version": "1.0.0",
   "scripts": {
-    "test": "npm run check-markdown && npm run check-examples",
+    "test": "npm run check-markdown && npm run check-examples && npm run check-schema",
     "check-markdown": "remark . -f -r .github/remark.yaml",
     "check-examples": "stac-node-validator . --lint --verbose --schemaMap https://stac-extensions.github.io/language/v1.0.0/schema.json=./json-schema/schema.json",
+    "check-schema": "node tests/schema.js",
     "format-examples": "stac-node-validator . --format --schemaMap https://stac-extensions.github.io/language/v1.0.0/schema.json=./json-schema/schema.json"
   },
   "dependencies": {
+    "ajv": "^8.20.0",
     "remark-cli": "^8.0.0",
     "remark-lint": "^7.0.0",
     "remark-lint-no-html": "^2.0.0",
diff --git a/tests/schema.js b/tests/schema.js
new file mode 100644
index 0000000..9747ff6
--- /dev/null
+++ b/tests/schema.js
@@ -0,0 +1,54 @@
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+
+const Ajv = require('ajv');
+
+const extensionId = 'https://stac-extensions.github.io/language/v1.0.0/schema.json';
+const schemaPath = path.join(__dirname, '..', 'json-schema', 'schema.json');
+const schema = JSON.parse(fs.readFileSync(schemaPath, 'utf8'));
+const validate = new Ajv({allErrors: true, strict: false}).compile(schema);
+
+function assertInvalidHreflang(document, path) {
+  assert.equal(validate(document), false);
+  assert.ok(
+    validate.errors.some(error => error.instancePath === path),
+    `expected a validation error at ${path}`
+  );
+}
+
+assertInvalidHreflang(
+  {
+    stac_version: '1.1.0',
+    stac_extensions: [extensionId],
+    type: 'Catalog',
+    language: {code: 'en'},
+    links: [
+      {
+        rel: 'alternate',
+        href: 'de/catalog.json',
+        hreflang: 123
+      }
+    ]
+  },
+  '/links/0/hreflang'
+);
+
+assertInvalidHreflang(
+  {
+    stac_version: '1.1.0',
+    stac_extensions: [extensionId],
+    type: 'Feature',
+    properties: {language: {code: 'en'}},
+    links: [],
+    assets: {
+      metadata: {
+        href: 'metadata.xml',
+        hreflang: 123
+      }
+    }
+  },
+  '/assets/metadata/hreflang'
+);
+
+console.log('Invalid hreflang values are rejected on links and assets.');