diff --git a/samples/client/petstore/cpp-ue4/.openapi-generator/VERSION b/samples/client/petstore/cpp-ue4/.openapi-generator/VERSION
index 4b448de535c..5f68295fc19 100644
--- a/samples/client/petstore/cpp-ue4/.openapi-generator/VERSION
+++ b/samples/client/petstore/cpp-ue4/.openapi-generator/VERSION
@@ -1 +1 @@
-5.3.0-SNAPSHOT
\ No newline at end of file
+6.0.0-SNAPSHOT
\ No newline at end of file
diff --git a/samples/client/petstore/java/apache-httpclient/.openapi-generator/VERSION b/samples/client/petstore/java/apache-httpclient/.openapi-generator/VERSION
index 4b448de535c..5f68295fc19 100644
--- a/samples/client/petstore/java/apache-httpclient/.openapi-generator/VERSION
+++ b/samples/client/petstore/java/apache-httpclient/.openapi-generator/VERSION
@@ -1 +1 @@
-5.3.0-SNAPSHOT
\ No newline at end of file
+6.0.0-SNAPSHOT
\ No newline at end of file
diff --git a/samples/server/petstore/haskell-yesod/.openapi-generator/VERSION b/samples/server/petstore/haskell-yesod/.openapi-generator/VERSION
index 4b448de535c..5f68295fc19 100644
--- a/samples/server/petstore/haskell-yesod/.openapi-generator/VERSION
+++ b/samples/server/petstore/haskell-yesod/.openapi-generator/VERSION
@@ -1 +1 @@
-5.3.0-SNAPSHOT
\ No newline at end of file
+6.0.0-SNAPSHOT
\ No newline at end of file