diff --git a/.travis.yml b/.travis.yml
index ec95018..5694858 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,23 +1,13 @@
 language: python
 python:
-  - "2.7"
-  - "3.4"
+  - "3.6"
+  - "3.7"
+  - "3.8"
 # command to install dependencies
 cache: pip
 sudo: false
 virtualenv:
-  system_site_packages: true
-addons:
-  apt:
-    packages:
-      - libatlas-dev
-      - libatlas3gf-base
-      - libblas-dev
-      - libglib2.0-dev
-      - liblapack-dev
-      - python-matplotlib
-      - gfortran
-      - python-tk
+  system_site_packages: false
 install:
   # Install project requirements
   - pip install -r requirements.txt
diff --git a/requirements.txt b/requirements.txt
index 5518bd7..ebcf0a7 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,11 +1,11 @@
-numpy==1.9.2
-pylsl==1.10.4
-python-osc==1.6.3
-pyserial==2.7
-requests==2.7.0
-six==1.9.0
-socketIO-client==0.6.5
-websocket-client==0.32.0
-wheel==0.24.0
-Yapsy==1.11.23
+numpy>=1.9.2
+pylsl>=1.10.4
+python-osc>=1.6.3
+pyserial>=2.7
+requests>=2.7.0
+six>=1.9.0
+socketIO-client>=0.6.5
+websocket-client>=0.32.0
+wheel>=0.24.0
+Yapsy>=1.11.23
 xmltodict
\ No newline at end of file