diff --git a/gen-client.sh b/gen-client.sh
index 9f6a057..50a4e9b 100755
--- a/gen-client.sh
+++ b/gen-client.sh
@@ -21,7 +21,7 @@ VERSION="$(python3 -c "from packaging.version import Version; print(Version('${V
 echo "Version: ${VERSION}"
 
 OPENAPI_PYTHON_IMAGE="${OPENAPI_PYTHON_IMAGE:-docker.io/openapitools/openapi-generator-cli:v4.3.1}"
-OPENAPI_RUBY_IMAGE="${OPENAPI_RUBY_IMAGE:-docker.io/openapitools/openapi-generator-cli:v5.4.0}"
+OPENAPI_RUBY_IMAGE="${OPENAPI_RUBY_IMAGE:-docker.io/openapitools/openapi-generator-cli:v5.3.0}"
 OPENAPI_TYPESCRIPT_IMAGE="${OPENAPI_TYPESCRIPT_IMAGE:-docker.io/openapitools/openapi-generator-cli:v5.2.1}"
 
 if command -v podman > /dev/null