diff --git a/modules/openapi-generator/src/main/resources/python-flask/setup.mustache b/modules/openapi-generator/src/main/resources/python-flask/setup.mustache
index ef4c3bd3c0ac..bda71175d0da 100644
--- a/modules/openapi-generator/src/main/resources/python-flask/setup.mustache
+++ b/modules/openapi-generator/src/main/resources/python-flask/setup.mustache
@@ -14,10 +14,10 @@ VERSION = "{{packageVersion}}"
 # http://pypi.python.org/pypi/setuptools
 
 REQUIRES = [
-    "connexion==2.0.0",
-    "swagger-ui-bundle==0.0.2",
-    "python_dateutil==2.6.0"{{#supportPython2}},
-    "typing==3.5.2.2"{{/supportPython2}}
+    "connexion>=2.0.2",
+    "swagger-ui-bundle>=0.0.2",
+    "python_dateutil>=2.6.0"{{#supportPython2}},
+    "typing>=3.5.2.2"{{/supportPython2}}
 ]
 
 setup(
diff --git a/samples/openapi3/server/petstore/python-flask-python2/.openapi-generator/VERSION b/samples/openapi3/server/petstore/python-flask-python2/.openapi-generator/VERSION
index 83a328a9227e..c3a2c7076fa8 100644
--- a/samples/openapi3/server/petstore/python-flask-python2/.openapi-generator/VERSION
+++ b/samples/openapi3/server/petstore/python-flask-python2/.openapi-generator/VERSION
@@ -1 +1 @@
-4.1.0-SNAPSHOT
\ No newline at end of file
+4.2.0-SNAPSHOT
\ No newline at end of file
diff --git a/samples/openapi3/server/petstore/python-flask-python2/git_push.sh b/samples/openapi3/server/petstore/python-flask-python2/git_push.sh
index 20057f67ade4..ced3be2b0c7b 100644
--- a/samples/openapi3/server/petstore/python-flask-python2/git_push.sh
+++ b/samples/openapi3/server/petstore/python-flask-python2/git_push.sh
@@ -1,11 +1,17 @@
 #!/bin/sh
 # ref: https://help.github.com/articles/adding-an-existing-project-to-github-using-the-command-line/
 #
-# Usage example: /bin/sh ./git_push.sh wing328 openapi-pestore-perl "minor update"
+# Usage example: /bin/sh ./git_push.sh wing328 openapi-pestore-perl "minor update" "gitlab.com"
 
 git_user_id=$1
 git_repo_id=$2
 release_note=$3
+git_host=$4
+
+if [ "$git_host" = "" ]; then
+    git_host="github.com"
+    echo "[INFO] No command line input provided. Set \$git_host to $git_host"
+fi
 
 if [ "$git_user_id" = "" ]; then
     git_user_id="GIT_USER_ID"
@@ -37,9 +43,9 @@ if [ "$git_remote" = "" ]; then # git remote not defined
 
     if [ "$GIT_TOKEN" = "" ]; then
         echo "[INFO] \$GIT_TOKEN (environment variable) is not set. Using the git credential in your environment."
-        git remote add origin https://github.com/${git_user_id}/${git_repo_id}.git
+        git remote add origin https://${git_host}/${git_user_id}/${git_repo_id}.git
     else
-        git remote add origin https://${git_user_id}:${GIT_TOKEN}@github.com/${git_user_id}/${git_repo_id}.git
+        git remote add origin https://${git_user_id}:${GIT_TOKEN}@${git_host}/${git_user_id}/${git_repo_id}.git
     fi
 
 fi
@@ -47,6 +53,6 @@ fi
 git pull origin master
 
 # Pushes (Forces) the changes in the local repository up to the remote repository
-echo "Git pushing to https://github.com/${git_user_id}/${git_repo_id}.git"
+echo "Git pushing to https://${git_host}/${git_user_id}/${git_repo_id}.git"
 git push origin master 2>&1 | grep -v 'To https'
 
diff --git a/samples/openapi3/server/petstore/python-flask-python2/openapi_server/controllers/pet_controller.py b/samples/openapi3/server/petstore/python-flask-python2/openapi_server/controllers/pet_controller.py
index 253f3bbfa1c8..125820f00549 100644
--- a/samples/openapi3/server/petstore/python-flask-python2/openapi_server/controllers/pet_controller.py
+++ b/samples/openapi3/server/petstore/python-flask-python2/openapi_server/controllers/pet_controller.py
@@ -49,15 +49,13 @@ def find_pets_by_status(status):  # noqa: E501
     return 'do some magic!'
 
 
-def find_pets_by_tags(tags, max_count=None):  # noqa: E501
+def find_pets_by_tags(tags):  # noqa: E501
     """Finds Pets by tags
 
     Multiple tags can be provided with comma separated strings. Use tag1, tag2, tag3 for testing. # noqa: E501
 
     :param tags: Tags to filter by
     :type tags: List[str]
-    :param max_count: Maximum number of items to return
-    :type max_count: int
 
     :rtype: List[Pet]
     """
diff --git a/samples/openapi3/server/petstore/python-flask-python2/openapi_server/openapi/openapi.yaml b/samples/openapi3/server/petstore/python-flask-python2/openapi_server/openapi/openapi.yaml
index 851fb5fb8167..42547ecf8ac9 100644
--- a/samples/openapi3/server/petstore/python-flask-python2/openapi_server/openapi/openapi.yaml
+++ b/samples/openapi3/server/petstore/python-flask-python2/openapi_server/openapi/openapi.yaml
@@ -115,15 +115,6 @@ paths:
             type: string
           type: array
         style: form
-      - description: Maximum number of items to return
-        explode: true
-        in: query
-        name: maxCount
-        required: false
-        schema:
-          format: int32
-          type: integer
-        style: form
       responses:
         200:
           content:
diff --git a/samples/openapi3/server/petstore/python-flask-python2/openapi_server/test/test_pet_controller.py b/samples/openapi3/server/petstore/python-flask-python2/openapi_server/test/test_pet_controller.py
index 7f8dfc547f18..230ac4a4b607 100644
--- a/samples/openapi3/server/petstore/python-flask-python2/openapi_server/test/test_pet_controller.py
+++ b/samples/openapi3/server/petstore/python-flask-python2/openapi_server/test/test_pet_controller.py
@@ -89,8 +89,7 @@ def test_find_pets_by_tags(self):
 
         Finds Pets by tags
         """
-        query_string = [('tags', 'tags_example'),
-                        ('maxCount', 56)]
+        query_string = [('tags', 'tags_example')]
         headers = { 
             'Accept': 'application/json',
             'Authorization': 'Bearer special-key',
diff --git a/samples/openapi3/server/petstore/python-flask-python2/openapi_server/util.py b/samples/openapi3/server/petstore/python-flask-python2/openapi_server/util.py
index 4b0188652ba7..e1185a713ec9 100644
--- a/samples/openapi3/server/petstore/python-flask-python2/openapi_server/util.py
+++ b/samples/openapi3/server/petstore/python-flask-python2/openapi_server/util.py
@@ -16,7 +16,7 @@ def _deserialize(data, klass):
     if data is None:
         return None
 
-    if klass in six.integer_types or klass in (float, str, bool):
+    if klass in six.integer_types or klass in (float, str, bool, bytearray):
         return _deserialize_primitive(data, klass)
     elif klass == object:
         return _deserialize_object(data)
diff --git a/samples/openapi3/server/petstore/python-flask-python2/setup.py b/samples/openapi3/server/petstore/python-flask-python2/setup.py
index e18faf930bc5..322e14e654a7 100644
--- a/samples/openapi3/server/petstore/python-flask-python2/setup.py
+++ b/samples/openapi3/server/petstore/python-flask-python2/setup.py
@@ -14,10 +14,10 @@
 # http://pypi.python.org/pypi/setuptools
 
 REQUIRES = [
-    "connexion==2.0.0",
-    "swagger-ui-bundle==0.0.2",
-    "python_dateutil==2.6.0",
-    "typing==3.5.2.2"
+    "connexion>=2.0.2",
+    "swagger-ui-bundle>=0.0.2",
+    "python_dateutil>=2.6.0",
+    "typing>=3.5.2.2"
 ]
 
 setup(
diff --git a/samples/openapi3/server/petstore/python-flask/.openapi-generator/VERSION b/samples/openapi3/server/petstore/python-flask/.openapi-generator/VERSION
index 83a328a9227e..c3a2c7076fa8 100644
--- a/samples/openapi3/server/petstore/python-flask/.openapi-generator/VERSION
+++ b/samples/openapi3/server/petstore/python-flask/.openapi-generator/VERSION
@@ -1 +1 @@
-4.1.0-SNAPSHOT
\ No newline at end of file
+4.2.0-SNAPSHOT
\ No newline at end of file
diff --git a/samples/openapi3/server/petstore/python-flask/git_push.sh b/samples/openapi3/server/petstore/python-flask/git_push.sh
index 20057f67ade4..ced3be2b0c7b 100644
--- a/samples/openapi3/server/petstore/python-flask/git_push.sh
+++ b/samples/openapi3/server/petstore/python-flask/git_push.sh
@@ -1,11 +1,17 @@
 #!/bin/sh
 # ref: https://help.github.com/articles/adding-an-existing-project-to-github-using-the-command-line/
 #
-# Usage example: /bin/sh ./git_push.sh wing328 openapi-pestore-perl "minor update"
+# Usage example: /bin/sh ./git_push.sh wing328 openapi-pestore-perl "minor update" "gitlab.com"
 
 git_user_id=$1
 git_repo_id=$2
 release_note=$3
+git_host=$4
+
+if [ "$git_host" = "" ]; then
+    git_host="github.com"
+    echo "[INFO] No command line input provided. Set \$git_host to $git_host"
+fi
 
 if [ "$git_user_id" = "" ]; then
     git_user_id="GIT_USER_ID"
@@ -37,9 +43,9 @@ if [ "$git_remote" = "" ]; then # git remote not defined
 
     if [ "$GIT_TOKEN" = "" ]; then
         echo "[INFO] \$GIT_TOKEN (environment variable) is not set. Using the git credential in your environment."
-        git remote add origin https://github.com/${git_user_id}/${git_repo_id}.git
+        git remote add origin https://${git_host}/${git_user_id}/${git_repo_id}.git
     else
-        git remote add origin https://${git_user_id}:${GIT_TOKEN}@github.com/${git_user_id}/${git_repo_id}.git
+        git remote add origin https://${git_user_id}:${GIT_TOKEN}@${git_host}/${git_user_id}/${git_repo_id}.git
     fi
 
 fi
@@ -47,6 +53,6 @@ fi
 git pull origin master
 
 # Pushes (Forces) the changes in the local repository up to the remote repository
-echo "Git pushing to https://github.com/${git_user_id}/${git_repo_id}.git"
+echo "Git pushing to https://${git_host}/${git_user_id}/${git_repo_id}.git"
 git push origin master 2>&1 | grep -v 'To https'
 
diff --git a/samples/openapi3/server/petstore/python-flask/setup.py b/samples/openapi3/server/petstore/python-flask/setup.py
index 9d7b02fbd90b..1cd2660efd67 100644
--- a/samples/openapi3/server/petstore/python-flask/setup.py
+++ b/samples/openapi3/server/petstore/python-flask/setup.py
@@ -14,9 +14,9 @@
 # http://pypi.python.org/pypi/setuptools
 
 REQUIRES = [
-    "connexion==2.0.0",
-    "swagger-ui-bundle==0.0.2",
-    "python_dateutil==2.6.0"
+    "connexion>=2.0.2",
+    "swagger-ui-bundle>=0.0.2",
+    "python_dateutil>=2.6.0"
 ]
 
 setup(
diff --git a/samples/server/petstore/python-flask-python2/.openapi-generator/VERSION b/samples/server/petstore/python-flask-python2/.openapi-generator/VERSION
index 83a328a9227e..c3a2c7076fa8 100644
--- a/samples/server/petstore/python-flask-python2/.openapi-generator/VERSION
+++ b/samples/server/petstore/python-flask-python2/.openapi-generator/VERSION
@@ -1 +1 @@
-4.1.0-SNAPSHOT
\ No newline at end of file
+4.2.0-SNAPSHOT
\ No newline at end of file
diff --git a/samples/server/petstore/python-flask-python2/git_push.sh b/samples/server/petstore/python-flask-python2/git_push.sh
index 20057f67ade4..ced3be2b0c7b 100644
--- a/samples/server/petstore/python-flask-python2/git_push.sh
+++ b/samples/server/petstore/python-flask-python2/git_push.sh
@@ -1,11 +1,17 @@
 #!/bin/sh
 # ref: https://help.github.com/articles/adding-an-existing-project-to-github-using-the-command-line/
 #
-# Usage example: /bin/sh ./git_push.sh wing328 openapi-pestore-perl "minor update"
+# Usage example: /bin/sh ./git_push.sh wing328 openapi-pestore-perl "minor update" "gitlab.com"
 
 git_user_id=$1
 git_repo_id=$2
 release_note=$3
+git_host=$4
+
+if [ "$git_host" = "" ]; then
+    git_host="github.com"
+    echo "[INFO] No command line input provided. Set \$git_host to $git_host"
+fi
 
 if [ "$git_user_id" = "" ]; then
     git_user_id="GIT_USER_ID"
@@ -37,9 +43,9 @@ if [ "$git_remote" = "" ]; then # git remote not defined
 
     if [ "$GIT_TOKEN" = "" ]; then
         echo "[INFO] \$GIT_TOKEN (environment variable) is not set. Using the git credential in your environment."
-        git remote add origin https://github.com/${git_user_id}/${git_repo_id}.git
+        git remote add origin https://${git_host}/${git_user_id}/${git_repo_id}.git
     else
-        git remote add origin https://${git_user_id}:${GIT_TOKEN}@github.com/${git_user_id}/${git_repo_id}.git
+        git remote add origin https://${git_user_id}:${GIT_TOKEN}@${git_host}/${git_user_id}/${git_repo_id}.git
     fi
 
 fi
@@ -47,6 +53,6 @@ fi
 git pull origin master
 
 # Pushes (Forces) the changes in the local repository up to the remote repository
-echo "Git pushing to https://github.com/${git_user_id}/${git_repo_id}.git"
+echo "Git pushing to https://${git_host}/${git_user_id}/${git_repo_id}.git"
 git push origin master 2>&1 | grep -v 'To https'
 
diff --git a/samples/server/petstore/python-flask-python2/openapi_server/util.py b/samples/server/petstore/python-flask-python2/openapi_server/util.py
index 4b0188652ba7..e1185a713ec9 100644
--- a/samples/server/petstore/python-flask-python2/openapi_server/util.py
+++ b/samples/server/petstore/python-flask-python2/openapi_server/util.py
@@ -16,7 +16,7 @@ def _deserialize(data, klass):
     if data is None:
         return None
 
-    if klass in six.integer_types or klass in (float, str, bool):
+    if klass in six.integer_types or klass in (float, str, bool, bytearray):
         return _deserialize_primitive(data, klass)
     elif klass == object:
         return _deserialize_object(data)
diff --git a/samples/server/petstore/python-flask-python2/setup.py b/samples/server/petstore/python-flask-python2/setup.py
index e18faf930bc5..322e14e654a7 100644
--- a/samples/server/petstore/python-flask-python2/setup.py
+++ b/samples/server/petstore/python-flask-python2/setup.py
@@ -14,10 +14,10 @@
 # http://pypi.python.org/pypi/setuptools
 
 REQUIRES = [
-    "connexion==2.0.0",
-    "swagger-ui-bundle==0.0.2",
-    "python_dateutil==2.6.0",
-    "typing==3.5.2.2"
+    "connexion>=2.0.2",
+    "swagger-ui-bundle>=0.0.2",
+    "python_dateutil>=2.6.0",
+    "typing>=3.5.2.2"
 ]
 
 setup(
diff --git a/samples/server/petstore/python-flask/.openapi-generator/VERSION b/samples/server/petstore/python-flask/.openapi-generator/VERSION
index 83a328a9227e..c3a2c7076fa8 100644
--- a/samples/server/petstore/python-flask/.openapi-generator/VERSION
+++ b/samples/server/petstore/python-flask/.openapi-generator/VERSION
@@ -1 +1 @@
-4.1.0-SNAPSHOT
\ No newline at end of file
+4.2.0-SNAPSHOT
\ No newline at end of file
diff --git a/samples/server/petstore/python-flask/git_push.sh b/samples/server/petstore/python-flask/git_push.sh
index 20057f67ade4..ced3be2b0c7b 100644
--- a/samples/server/petstore/python-flask/git_push.sh
+++ b/samples/server/petstore/python-flask/git_push.sh
@@ -1,11 +1,17 @@
 #!/bin/sh
 # ref: https://help.github.com/articles/adding-an-existing-project-to-github-using-the-command-line/
 #
-# Usage example: /bin/sh ./git_push.sh wing328 openapi-pestore-perl "minor update"
+# Usage example: /bin/sh ./git_push.sh wing328 openapi-pestore-perl "minor update" "gitlab.com"
 
 git_user_id=$1
 git_repo_id=$2
 release_note=$3
+git_host=$4
+
+if [ "$git_host" = "" ]; then
+    git_host="github.com"
+    echo "[INFO] No command line input provided. Set \$git_host to $git_host"
+fi
 
 if [ "$git_user_id" = "" ]; then
     git_user_id="GIT_USER_ID"
@@ -37,9 +43,9 @@ if [ "$git_remote" = "" ]; then # git remote not defined
 
     if [ "$GIT_TOKEN" = "" ]; then
         echo "[INFO] \$GIT_TOKEN (environment variable) is not set. Using the git credential in your environment."
-        git remote add origin https://github.com/${git_user_id}/${git_repo_id}.git
+        git remote add origin https://${git_host}/${git_user_id}/${git_repo_id}.git
     else
-        git remote add origin https://${git_user_id}:${GIT_TOKEN}@github.com/${git_user_id}/${git_repo_id}.git
+        git remote add origin https://${git_user_id}:${GIT_TOKEN}@${git_host}/${git_user_id}/${git_repo_id}.git
     fi
 
 fi
@@ -47,6 +53,6 @@ fi
 git pull origin master
 
 # Pushes (Forces) the changes in the local repository up to the remote repository
-echo "Git pushing to https://github.com/${git_user_id}/${git_repo_id}.git"
+echo "Git pushing to https://${git_host}/${git_user_id}/${git_repo_id}.git"
 git push origin master 2>&1 | grep -v 'To https'
 
diff --git a/samples/server/petstore/python-flask/setup.py b/samples/server/petstore/python-flask/setup.py
index 9d7b02fbd90b..1cd2660efd67 100644
--- a/samples/server/petstore/python-flask/setup.py
+++ b/samples/server/petstore/python-flask/setup.py
@@ -14,9 +14,9 @@
 # http://pypi.python.org/pypi/setuptools
 
 REQUIRES = [
-    "connexion==2.0.0",
-    "swagger-ui-bundle==0.0.2",
-    "python_dateutil==2.6.0"
+    "connexion>=2.0.2",
+    "swagger-ui-bundle>=0.0.2",
+    "python_dateutil>=2.6.0"
 ]
 
 setup(