diff --git a/.travis.yml b/.travis.yml
index 81ac11d56..769b30770 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,25 +4,41 @@ env:
   global:
     PIP_PREFER_BINARY=true # https://github.com/numba/llvmlite/issues/471
 
-python:
-  - "2.7"
-#  - "3.3" # failed due to setuptool version
-#  - "3.4" # failed due to numba (llvmlite)
-  - "3.5"
-  - "3.5-dev"  # 3.5 development branch
-  - "3.6"
-  - "3.6-dev"  # 3.6 development branch
+matrix:
+  include:
+
+    - os: linux
+      sudo: required
+      services: docker
+      python: '2.7'
+
+      #  - "3.3" # failed due to setuptool version
+      #  - "3.4" # failed due to numba (llvmlite)
+
+    - os: linux
+      sudo: required
+      services: docker
+      python: '3.5'
+
+    - os: linux
+      sudo: required
+      services: docker
+      python: '3.6'
+
+    - os: linux
+      dist: xenial
+      sudo: required
+      services: docker
+      python: '3.7'
+
 
 install:
   - pip install --upgrade pip
   - pip install -r requirements_ci.txt
-  - pip install pytest
-  - pip install pytest-cov
-  - pip install coveralls
 
-# command to run tests
 script:
-   pytest --cov=pyod/
+    # Show the 20 slowest running tests
+  - pytest --cov=pyod/ --durations=20
 
 after_success:
   - coveralls
@@ -32,4 +48,4 @@ notifications:
     recipients:
       - yzhao062@gmail.com
   on_success: never # default: change
-  on_failure: always # default: always
\ No newline at end of file
+  on_failure: always # default: always
diff --git a/requirements_ci.txt b/requirements_ci.txt
index 267a6bf09..04cb2fe9a 100644
--- a/requirements_ci.txt
+++ b/requirements_ci.txt
@@ -7,4 +7,8 @@ numba>=0.35
 scipy==1.1.0
 scikit_learn>=0.19.1
 tensorflow
-xgboost>=0.7
\ No newline at end of file
+xgboost>=0.7
+pytest>=3.6
+pytest-cov
+coveralls
+