diff --git a/CHANGELOG.md b/CHANGELOG.md
index b8a91cd..5284548 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## [0.15.0] - 2025-05-08
+
+### Changed
+
+- Open API specs config object is fully spread into the final output
+
 ## [0.14.3] - 2025-04-27
 
 upgraded dependencies: `jsr:@std/assert@^1.0.13`, `jsr:@std/path@^1.0.9`,
diff --git a/deno.jsonc b/deno.jsonc
index 706ee44..362c9c8 100644
--- a/deno.jsonc
+++ b/deno.jsonc
@@ -1,6 +1,6 @@
 {
   "name": "@dklab/oak-routing-ctrl",
-  "version": "0.14.3",
+  "version": "0.15.0",
   "exports": {
     ".": "./mod.ts",
     "./mod": "./mod.ts"
diff --git a/src/oasStore.ts b/src/oasStore.ts
index a16b9b6..1ed89ea 100644
--- a/src/oasStore.ts
+++ b/src/oasStore.ts
@@ -59,6 +59,7 @@ export const updateOas = (
 
   const updated = {
     ...existing,
+    ...specs,
     method,
     path: oasPath,
     request: {
diff --git a/src/useOas.ts b/src/useOas.ts
index 670b7de..0720b8d 100644
--- a/src/useOas.ts
+++ b/src/useOas.ts
@@ -74,7 +74,7 @@ const _useOas: UseOas = (
 
   const generator = new OpenApiGenerator(registry.definitions);
   const apiDoc = generator.generateDocument({
-    openapi: "3.0.0",
+    openapi: oasCfg.openapi || "3.0.0",
     info: {
       version: "1.0.0",
       title: "My API",