diff --git a/CHANGELOG.md b/CHANGELOG.md
index a770982..9b9ba6e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## Unreleased
+### Changed
+- Upgrade OpenAPI Generator to 7.4.0
 
 ## 4.1.0 - 2024-01-07
 ### Changed
diff --git a/src/Makefile-swaggy-c b/src/Makefile-swaggy-c
index b00ab00..2e5e290 100644
--- a/src/Makefile-swaggy-c
+++ b/src/Makefile-swaggy-c
@@ -7,7 +7,7 @@
 SWAGGY_C_VERSION = 4.1.1-pre.0
 
 # The version of OpenAPI Generator (https://openapi-generator.tech/) used for generating the API clients
-OPENAPI_GENERATOR_VERSION = 7.2.0
+OPENAPI_GENERATOR_VERSION = 7.4.0
 
 # LANGS_ALL lists the languages supported by the given OPENAPI_GENERATOR_VERSION
 LANGS_ALL = ada ada-server android apache2 apex asciidoc aspnetcore avro-schema bash crystal c clojure cwiki cpp-qt-client cpp-qt-qhttpengine-server cpp-pistache-server cpp-restbed-server cpp-restsdk cpp-tiny cpp-tizen cpp-ue4 csharp csharp-netcore csharp-dotnet2 csharp-netcore-functions dart dart-dio eiffel elixir elm erlang-client erlang-proper erlang-server fsharp-functions fsharp-giraffe-server go go-echo-server go-server go-gin-server graphql-schema graphql-nodejs-express-server groovy kotlin kotlin-server kotlin-spring kotlin-vertx ktorm-schema haskell-http-client haskell haskell-yesod jaxrs-cxf-client java java-inflector java-micronaut-client java-micronaut-server java-msf4j java-pkmst java-play-framework java-undertow-server java-vertx java-vertx-web java-camel jaxrs-cxf jaxrs-cxf-extended jaxrs-cxf-cdi jaxrs-jersey jaxrs-resteasy jaxrs-resteasy-eap jaxrs-spec javascript javascript-apollo javascript-flowtyped javascript-closure-angular jmeter k6 lua markdown mysql-schema nim nodejs-express-server objc ocaml openapi openapi-yaml plantuml perl php php-laravel php-lumen php-slim-deprecated php-slim4 php-symfony php-mezzio-ph php-dt powershell protobuf-schema python python-legacy python-fastapi python-experimental python-flask python-aiohttp python-blueplanet python r ruby ruby-on-rails ruby-sinatra rust rust-server scalatra scala-akka scala-akka-http-server scala-finch scala-httpclient-deprecated scala-gatling scala-lagom-server scala-play-server scala-sttp scalaz spring dynamic-html html html2 swift5 typescript typescript-angular typescript-aurelia typescript-axios typescript-fetch typescript-inversify typescript-jquery typescript-nestjs typescript-node typescript-redux-query typescript-rxjs wsdl-schema