diff --git a/package.json b/package.json
index 655ddc58..20247497 100644
--- a/package.json
+++ b/package.json
@@ -70,7 +70,7 @@
     "@docusaurus/theme-common": "~3.9.2",
     "@docusaurus/tsconfig": "~3.9.2",
     "@docusaurus/types": "~3.9.2",
-    "@ideal-postcodes/openapi": "~4.14.1",
+    "@ideal-postcodes/openapi": "~4.18.1",
     "@mdx-js/react": "~3.1.1",
     "@redocly/cli": "~1.34.14",
     "@svgr/webpack": "~8.1.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 008ea507..51f7c5f5 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -86,8 +86,8 @@ importers:
         specifier: ~3.9.2
         version: 3.9.2(clean-css@5.3.3)(cssnano@6.1.2(postcss@8.5.15))(html-minifier-terser@7.2.0)(postcss@8.5.15)(react-dom@19.2.6(react@19.2.6))(react@19.2.6)
       '@ideal-postcodes/openapi':
-        specifier: ~4.14.1
-        version: 4.14.1
+        specifier: ~4.18.1
+        version: 4.18.1
       '@mdx-js/react':
         specifier: ~3.1.1
         version: 3.1.1(@types/react@19.1.17)(react@19.2.6)
@@ -1436,8 +1436,8 @@ packages:
     resolution: {integrity: sha512-RE815I4arJFtt+FVeU1Tgp9/Xvecacji8w/V6XtXsWWH/wz/eNkNbhb+ny/+PlVZjV0rxQpRSQKNKE3lcktHEA==}
     engines: {node: '>=10.10.0'}
 
-  '@ideal-postcodes/openapi@4.14.1':
-    resolution: {integrity: sha512-kwQkX81MNbHi18JF8ze+shjsoG2iEET9RvpqVFmAN2Rinc1QCzxz9W9iUTIWCBly0AsNJNT4wlU6KS72okrV7g==}
+  '@ideal-postcodes/openapi@4.18.1':
+    resolution: {integrity: sha512-4e3xwhjWlSftRh2h09kTTBwpiz4mXwSi5PA1iqhzTRZi45IRz5VEZQjntytqxL0oi6SBUnCzYXO1yiYLSaCyYA==}
 
   '@jest/schemas@29.6.3':
     resolution: {integrity: sha512-mo5j5X+jIZmJQveBKeS/clAueipV7KgiX1vMgCxam1RNYiqE1w62n0/tJJnHtjW8ZHcQco5gY85jA3mi0L+nSA==}
@@ -1613,8 +1613,8 @@ packages:
       '@types/react': '>=16'
       react: '>=16'
 
-  '@napi-rs/wasm-runtime@1.1.4':
-    resolution: {integrity: sha512-3NQNNgA1YSlJb/kMH1ildASP9HW7/7kYnRI2szWJaofaS1hWmbGI4H+d3+22aGzXXN9IJ+n+GiFVcGipJP18ow==}
+  '@napi-rs/wasm-runtime@1.1.5':
+    resolution: {integrity: sha512-AWPoBRJ9tsnVhor4sjO7rkni+7p+2IAEFj6cx06UgP10jkQHqay/36uRV/bFkgrh18D9vb4cr8Q0Pthskgzy+Q==}
     peerDependencies:
       '@emnapi/core': ^1.7.1
       '@emnapi/runtime': ^1.7.1
@@ -7665,6 +7665,10 @@ packages:
     resolution: {integrity: sha512-pn99VhoACYR8nFHhxqix+uvsbXineAasWm5ojXoN8xEwK5Kd3/TrhNn1wByuD52UxWRLy8pu+kRMniEi6Eq9Zg==}
     engines: {node: '>=12.0.0'}
 
+  tinyglobby@0.2.17:
+    resolution: {integrity: sha512-wXR/dYpcqKmfWpEdZjiKJOwCNFndD0DMnrW/cYjVGttEkBfVgcLFHoNrlj47mjOVic9yyNu65alsgF4NQyTa2g==}
+    engines: {node: '>=12.0.0'}
+
   tinypool@1.1.1:
     resolution: {integrity: sha512-Zba82s87IFq9A9XmjiX5uZA/ARWDrB03OHlq+Vw1fSdt0I+4/Kutwy8BP4Y/y/aORMo61FQ0vIb5j44vSo5Pkg==}
     engines: {node: ^18.0.0 || >=20.0.0}
@@ -10516,7 +10520,7 @@ snapshots:
 
   '@humanwhocodes/momoa@2.0.4': {}
 
-  '@ideal-postcodes/openapi@4.14.1': {}
+  '@ideal-postcodes/openapi@4.18.1': {}
 
   '@jest/schemas@29.6.3':
     dependencies:
@@ -10730,7 +10734,7 @@ snapshots:
       '@types/react': 19.1.17
       react: 19.2.6
 
-  '@napi-rs/wasm-runtime@1.1.4(@emnapi/core@1.10.0)(@emnapi/runtime@1.10.0)':
+  '@napi-rs/wasm-runtime@1.1.5(@emnapi/core@1.10.0)(@emnapi/runtime@1.10.0)':
     dependencies:
       '@emnapi/core': 1.10.0
       '@emnapi/runtime': 1.10.0
@@ -11305,7 +11309,7 @@ snapshots:
     dependencies:
       '@emnapi/core': 1.10.0
       '@emnapi/runtime': 1.10.0
-      '@napi-rs/wasm-runtime': 1.1.4(@emnapi/core@1.10.0)(@emnapi/runtime@1.10.0)
+      '@napi-rs/wasm-runtime': 1.1.5(@emnapi/core@1.10.0)(@emnapi/runtime@1.10.0)
     optional: true
 
   '@rolldown/binding-win32-arm64-msvc@1.0.0':
@@ -17832,6 +17836,11 @@ snapshots:
       fdir: 6.5.0(picomatch@4.0.4)
       picomatch: 4.0.4
 
+  tinyglobby@0.2.17:
+    dependencies:
+      fdir: 6.5.0(picomatch@4.0.4)
+      picomatch: 4.0.4
+
   tinypool@1.1.1: {}
 
   tinyrainbow@3.1.0: {}
@@ -18149,7 +18158,7 @@ snapshots:
       picomatch: 4.0.4
       postcss: 8.5.15
       rolldown: 1.0.0
-      tinyglobby: 0.2.16
+      tinyglobby: 0.2.17
     optionalDependencies:
       '@types/node': 24.0.15
       fsevents: 2.3.3