diff --git a/Dockerfile b/Dockerfile
index 6f3bb9b..f231ab4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,7 @@ SHELL ["/bin/bash", "-c"]
 WORKDIR /workspace
 
 # install dependencies
-RUN npm install @swagger-api/apidom-ls@">=1.0.0-beta.5" @actions/core vscode-languageserver-textdocument
+RUN npm install @swagger-api/apidom-ls@">=1.0.0-beta.6" @actions/core vscode-languageserver-textdocument
 
 COPY validate.cjs .
 ENTRYPOINT ["node", "/workspace/validate.cjs"]
diff --git a/README.md b/README.md
index 2e0ffeb..47a6fb7 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ Validation rules are exactly the same as the one that https://editor-next.swagge
 - [OpenAPI 3.0.1](https://spec.openapis.org/oas/v3.0.1.html)
 - [OpenAPI 3.0.2](https://spec.openapis.org/oas/v3.0.2.html)
 - [OpenAPI 3.0.3](https://spec.openapis.org/oas/v3.0.3.html)
+- [OpenAPI 3.0.3](https://spec.openapis.org/oas/v3.0.4.html)
 - [OpenAPI 3.1.0](https://spec.openapis.org/oas/v3.1.0.html)
 - [AsyncAPI 2.0.0](https://v2.asyncapi.com/docs/reference/specification/v2.0.0)
 - [AsyncAPI 2.1.0](https://v2.asyncapi.com/docs/reference/specification/v2.1.0)