diff --git a/.travis.yml b/.travis.yml
index aa2665f2..f2f05655 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -33,8 +33,8 @@ matrix:
       language: generic
       python: "2.7"
       env:
-        - CONDA=2.7
         - QT=4
+        - CONDA=4.2.0
       addons:
         apt:
           packages:
@@ -45,12 +45,14 @@ matrix:
       before_install:
         # ref: https://www.continuum.io/downloads
         - curl -O https://repo.continuum.io/archive/Anaconda2-4.2.0-Linux-x86_64.sh
-        - /bin/bash Anaconda2-4.2.0-Linux-x86_64.sh
+        # ref: http://conda.pydata.org/docs/help/silent.html
+        - /bin/bash Anaconda2-4.2.0-Linux-x86_64.sh -b -p $HOME/anaconda2
+        - export PATH="$HOME/anaconda2/bin:$PATH"
         # ref: http://stackoverflow.com/questions/21637922/how-to-install-pyqt4-in-anaconda
-        - conda create -n labelImg-py2qt4 python=2.7
+        - conda create -y -n labelImg-py2qt4 python=2.7
         - source activate labelImg-py2qt4
-        - conda install pyqt=4
-        - conda install lxml
+        - conda install -y pyqt=4
+        - conda install -y lxml
         - make qt4py2
         - xvfb-run make testpy2
 
@@ -82,7 +84,7 @@ matrix:
       dist: trusty
       sudo: required
       language: generic
-      python: "3.4"
+      python: "3.5"
       env:
         - QT=4
       addons:
@@ -104,7 +106,7 @@ matrix:
       dist: trusty
       sudo: required
       language: generic
-      python: "3.4"
+      python: "3.5"
       env:
         - QT=5
       addons:
@@ -127,8 +129,8 @@ matrix:
       language: generic
       python: "3.5"
       env:
-        - CONDA=3.5
         - QT=5
+        - CONDA=4.2.0
       addons:
         apt:
           packages:
@@ -137,57 +139,17 @@ matrix:
       before_install:
         # ref: https://www.continuum.io/downloads
         - curl -O https://repo.continuum.io/archive/Anaconda3-4.2.0-Linux-x86_64.sh
-        - /bin/bash Anaconda3-4.2.0-Linux-x86_64.sh
+        # ref: http://conda.pydata.org/docs/help/silent.html
+        - /bin/bash Anaconda3-4.2.0-Linux-x86_64.sh -b -p $HOME/anaconda3
+        - export PATH="$HOME/anaconda3/bin:$PATH"
         # ref: http://stackoverflow.com/questions/21637922/how-to-install-pyqt4-in-anaconda
-        - conda create -n labelImg-py3qt5 python=3.5
+        - conda create -y -n labelImg-py3qt5 python=3.5
         - source activate labelImg-py3qt5
-        - conda install pyqt=5
-        - conda install lxml
+        - conda install -y pyqt=5
+        - conda install -y lxml
         - make qt5py3
         - xvfb-run make testpy3
 
-    # OS X 10.10 Python 2 + QT4
-    - os: osx
-      osx_image: xcode6.4  # OS X 10.10
-      sudo: required
-      language: generic
-      python: "2.7"
-      env:
-        - QT=4
-      before_install:
-        - brew install libxml2
-        - brew install cartr/qt4/qt
-        - brew linkapps qt
-        - which python pip
-        - python --version
-        - sudo -H easy_install-2.7 lxml || true
-        - python -c 'import sys; print(sys.path)'
-        - python -c 'import lxml'
-        - make qt4py2
-        - python -c 'help("modules")'
-        - make testpy2
-
-    # OS X 10.10 Python 3 + QT4
-    - os: osx
-      osx_image: xcode6.4  # OS X 10.10
-      sudo: required
-      language: generic
-      python: "3.6"
-      env:
-        - QT=4
-      before_install:
-        - brew install libxml2
-        - brew install cartr/qt4/qt
-        - brew linkapps qt
-        - which python3 pip3
-        - python3 --version
-        - sudo -H easy_install-3.6 lxml || true
-        - python3 -c 'import sys; print(sys.path)'
-        - python3 -c 'import lxml'
-        - make qt4py3
-        - python3 -c 'help("modules")'
-        - make testpy3
-
     # OS X 10.10 Python 3 + QT5
     - os: osx
       osx_image: xcode6.4  # Xcode 6.4, OS X 10.10
@@ -256,5 +218,76 @@ matrix:
         # just make sure the app runs... :-/
         - ( python3 labelImg.py ) & sleep 10; kill $!
 
+    # XXX: building QT4 from source takes forever...
+
+    # OS X 10.11 Python 2 + QT4
+    #- os: osx
+    #  osx_image: xcode7.3  # OS X 10.11
+    #  sudo: required
+    #  language: generic
+    #  python: "2.7"
+    #  env:
+    #    - QT=4
+    #  before_install:
+    #    - brew install libxml2
+    #    # build PyQT4...
+    #    - curl -L -O https://sourceforge.net/projects/pyqt/files/sip/sip-4.19/sip-4.19.tar.gz
+    #    - tar zxvf sip-4.19.tar.gz
+    #    - (cd sip-4.19 && python configure.py -d /Library/Python/2.7/site-packages --arch x86_64 && make && sudo make install)
+    #    # NOTE: produces insane amounts of output...
+    #    - brew install -v cartr/qt4/qt --with-qt3support --without-webkit | sed -e's/ .* / ... /'
+    #    - brew linkapps qt
+    #    - curl -L -O http://sourceforge.net/projects/pyqt/files/PyQt4/PyQt-4.12/PyQt4_gpl_mac-4.12.tar.gz
+    #    - tar zxvf PyQt4_gpl_mac-4.12.tar.gz
+    #    - cd PyQt4_gpl_mac-4.12
+    #    - python configure.py --help
+    #    - python configure.py -d /Library/Python/2.7/site-packages --use-arch=x86_64 --confirm-license
+    #    - make
+    #    - sudo make install
+    #    - cd -
+    #    - which python pip
+    #    - python --version
+    #    - sudo -H easy_install-2.7 lxml || true
+    #    - python -c 'import sys; print(sys.path)'
+    #    - python -c 'import lxml'
+    #    - make qt4py2
+    #    - python -c 'help("modules")'
+    #    - make testpy2
+
+    # OS X 10.11 Python 3 + QT4
+    #- os: osx
+    #  osx_image: xcode7.3  # OS X 10.11
+    #  sudo: required
+    #  language: generic
+    #  python: "3.6"
+    #  env:
+    #    - QT=4
+    #  before_install:
+    #    - brew install libxml2
+    #    - brew install python3
+    #    - which python pip python3 pip3 || true
+    #    - curl -L -O https://sourceforge.net/projects/pyqt/files/sip/sip-4.19/sip-4.19.tar.gz
+    #    - tar zxvf sip-4.19.tar.gz
+    #    - ( cd sip-4.19 && python3 configure.py -d /Library/Python/3.6/site-packages --arch x86_64 && make && sudo make install )
+    #    # NOTE: produces insane amounts of output...
+    #    - brew install -v cartr/qt4/qt --with-qt3support --without-webkit | sed -e's/ .* / ... /'
+    #    - brew linkapps qt
+    #    - curl -L -O http://sourceforge.net/projects/pyqt/files/PyQt4/PyQt-4.12/PyQt4_gpl_mac-4.12.tar.gz
+    #    - tar zxvf PyQt4_gpl_mac-4.12.tar.gz
+    #    - cd PyQt4_gpl_mac-4.12
+    #    - python3 configure.py --help
+    #    - python3 configure.py -d /Library/Python/3.6/site-packages --use-arch=x86_64 --confirm-license
+    #    - make
+    #    - sudo make install
+    #    - cd -
+    #    - which python3 pip3
+    #    - python3 --version
+    #    - sudo -H easy_install-3.6 lxml || true
+    #    - python3 -c 'import sys; print(sys.path)'
+    #    - python3 -c 'import lxml'
+    #    - make qt4py3
+    #    - python3 -c 'help("modules")'
+    #    - make testpy3
+
 script:
   - exit 0