diff --git a/.travis.yml b/.travis.yml
index fd94171a..36173923 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,7 @@ install:
   - pip install coverage
   - pip install coveralls
   - pip install -r requirements.txt
+  - pip install flask
 script:
   - coverage run --source=httprunner -m unittest discover
 after_success:
diff --git a/requirements.txt b/requirements.txt
index a285f256..d5d097a4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,4 @@
-requests[security]
-flask
+requests
 PyYAML
 PyUnitReport
 har2case
diff --git a/setup.py b/setup.py
index df978756..45d57299 100644
--- a/setup.py
+++ b/setup.py
@@ -18,12 +18,15 @@ setup(
     author_email='mail@debugtalk.com',
     url='https://github.com/debugtalk/HttpRunner',
     license='MIT',
-    packages=find_packages(exclude=['test.*', 'test']),
+    packages=find_packages(exclude=["examples", "tests", "tests.*"]),
     package_data={
         'httprunner': ['locustfile_template'],
     },
     keywords='api test',
     install_requires=install_requires,
+    extras_require={
+        'dev': ['flask']
+    },
     classifiers=[
         "Development Status :: 3 - Alpha",
         'Programming Language :: Python :: 2.7',