diff --git a/code/ch4_app/ch4_starter_video_collector/.gitignore b/code/ch4_app/ch4_starter_video_collector/.gitignore
new file mode 100644
index 0000000..d0fc8b5
--- /dev/null
+++ b/code/ch4_app/ch4_starter_video_collector/.gitignore
@@ -0,0 +1,3 @@
+venv/
+.idea/
+
diff --git a/code/ch4_app/ch4_starter_video_collector/requirements.txt b/code/ch4_app/ch4_starter_video_collector/requirements.txt
index f2e5eba..bdf1975 100644
--- a/code/ch4_app/ch4_starter_video_collector/requirements.txt
+++ b/code/ch4_app/ch4_starter_video_collector/requirements.txt
@@ -1,6 +1,6 @@
-flask
-Werkzeug
+flask~=0.12.3
+Werkzeug~=0.14.1
 pydantic
 more_itertools
 MarkupSafe
-Jinja2
+Jinja2==2.7
diff --git a/code/ch4_app/ch4_starter_video_collector/views/feed.py b/code/ch4_app/ch4_starter_video_collector/views/feed.py
index e7dcb70..73863b2 100644
--- a/code/ch4_app/ch4_starter_video_collector/views/feed.py
+++ b/code/ch4_app/ch4_starter_video_collector/views/feed.py
@@ -8,7 +8,7 @@
 blueprint = flask.Blueprint('feed', __name__, template_folder='templates')
 
 
-@blueprint.get('/feed')
+@blueprint.route('/feed')
 @response(template_file='feed/index.html')
 def index():
     time.sleep(5)
diff --git a/code/ch4_app/ch4_starter_video_collector/views/home.py b/code/ch4_app/ch4_starter_video_collector/views/home.py
index cf4b773..25c481b 100644
--- a/code/ch4_app/ch4_starter_video_collector/views/home.py
+++ b/code/ch4_app/ch4_starter_video_collector/views/home.py
@@ -6,7 +6,7 @@
 blueprint = flask.Blueprint('home', __name__, template_folder='templates')
 
 
-@blueprint.get('/')
+@blueprint.route('/')
 @response(template_file='home/index.html')
 def index():
     vm = IndexViewModel()
diff --git a/code/ch4_app/ch4_starter_video_collector/views/videos.py b/code/ch4_app/ch4_starter_video_collector/views/videos.py
index d211517..ef38f5a 100644
--- a/code/ch4_app/ch4_starter_video_collector/views/videos.py
+++ b/code/ch4_app/ch4_starter_video_collector/views/videos.py
@@ -7,14 +7,14 @@
 blueprint = flask.Blueprint('videos', __name__, template_folder='templates')
 
 
-@blueprint.get('/videos/category/<cat_name>')
+@blueprint.route('/videos/category/<cat_name>')
 @response(template_file='videos/category.html')
 def category(cat_name: str):
     vm = CategoryViewModel(cat_name)
     return vm.to_dict()
 
 
-@blueprint.get('/videos/play/<video_id>')
+@blueprint.route('/videos/play/<video_id>')
 @response(template_file='videos/play.html')
 def play(video_id: str):
     vm = PlayViewModel(video_id)