diff --git a/.gitignore b/.gitignore
index 1a311cdf2..bf3e871c9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,4 +17,4 @@ deluge.pot
 .build_data*
 osx/app
 RELEASE-VERSION
-.venv
+.venv*
diff --git a/.travis.yml b/.travis.yml
index d0b77bfaa..677b78950 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,6 +17,8 @@ addons:
     packages:
       # Need Py 3.6 specifically for pre-commit to run black formatter.
       - python3.6
+      # To provide ensurepip module.
+      - python3-venv
 
 # command to install dependencies
 install:
@@ -32,19 +34,27 @@ install:
 
 env:
   global:
-    - APTPACKAGES="python-libtorrent"
+    - APTPACKAGES="python-libtorrent python3-libtorrent"
     - APTPACKAGES_GTKUI="python-glade2"
     - DISPLAY=:99.0
 
 matrix:
   include:
-    - env: TOX_ENV=pydef
+    - name: Unit tests
+      env: TOX_ENV=pydef
     - if: commit_message =~ SECURITY_TEST
       env: TOX_ENV=security
-    - env: TOX_ENV=lint
-    - env: TOX_ENV=docs
-    - env: TOX_ENV=pygtkui            APTPACKAGES="$APTPACKAGES $APTPACKAGES_GTKUI"
-    - env: TOX_ENV=plugins
+    - name: Code linting
+      env: TOX_ENV=lint
+    - name: Docs build
+      env: TOX_ENV=docs
+    - name: PyGTK unit tests only
+      env: TOX_ENV=pygtkui            APTPACKAGES="$APTPACKAGES $APTPACKAGES_GTKUI"
+    - name: Plugins unit tests
+      env: TOX_ENV=plugins
+    - name: Python 3 unit tests
+      python: 3.5
+      env: TOX_ENV=py3
 
 virtualenv:
   system_site_packages: true
@@ -52,7 +62,7 @@ virtualenv:
 # We use xvfb for the GTKUI tests
 before_script:
   - export PYTHONPATH=$PYTHONPATH:$PWD
-  - python -c "import libtorrent as lt; print lt.__version__"
+  - python -c "import libtorrent as lt; print(lt.__version__)"
   - "/sbin/start-stop-daemon --start --quiet --pidfile /tmp/custom_xvfb_99.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :99 -ac -screen 0 1280x1024x16"
   - echo '2.0.0.dev0' > RELEASE-VERSION
 
diff --git a/requirements.txt b/requirements.txt
index fcc1b46d3..63923565a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,4 +9,4 @@ setproctitle
 pywin32; sys.platform == 'win32'
 py2-ipaddress; sys.platform == 'win32'
 certifi; sys.platform == 'win32'
-zope-interface
+zope.interface
diff --git a/tox.ini b/tox.ini
index 25b09b15c..f60321311 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,10 +8,14 @@ envlist = py27, lint, docs
 minversion=2.0
 
 [base]
-deps = -rrequirements.txt
+deps =
+# Minimum pip version and setuptools to fix issue running on travis.
+    pip>=10
+    setuptools
+    -rrequirements.txt
 
 [testenv]
-install_command = pip install --ignore-installed {opts} {packages}
+install_command = {envpython} -m pip install --ignore-installed {opts} {packages}
 passenv = DISPLAY PYTHONPATH
 setenv = PYTHONPATH = {toxinidir}
 sitepackages = True
@@ -23,7 +27,7 @@ whitelist_externals = pytest
 [pytest]
 # Hide logged warnings and errors in test output.
 log_cli_level = CRITICAL
-
+addopts = -p no:warnings
 
 # ==========
 # Unit tests
@@ -64,8 +68,6 @@ commands =
     pytest -v --basetemp=_pytest_temp -s deluge/plugins
 
 [testenv:py27]
-deps =
-    {[testenv]deps}
 basepython = python2.7
 commands = {[testenv:pydef]commands}
 
@@ -194,7 +196,18 @@ commands =
 # ========================
 # Developement Environment
 # ========================
-[testenv:devenv]
-envdir = .venv
+[basedev]
 usedevelop = True
 deps = -rrequirements-dev.txt
+
+[testenv:denv2]
+envdir = .venv2
+basepython = python2.7
+usedevelop = {[basedev]usedevelop}
+deps = {[basedev]deps}
+
+[testenv:denv3]
+basepython = python3
+envdir = .venv3
+usedevelop = {[basedev]usedevelop}
+deps = {[basedev]deps}