diff --git a/.travis.yml b/.travis.yml
index 9f477e860..4e28d6f11 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,10 +12,9 @@ matrix:
     - env: TOXENV=flake8
       python: 3.8
     - env: TOXENV=pypy3
-      python: 3.5
     - env: TOXENV=py35
       python: 3.5
-    - env: TOXENV=py35-pinned
+    - env: TOXENV=pinned
       python: 3.5
     - env: TOXENV=py36
       python: 3.6
@@ -23,7 +22,7 @@ matrix:
       python: 3.7
     - env: TOXENV=py38
       python: 3.8
-    - env: TOXENV=py38-extra-deps
+    - env: TOXENV=extra-deps
       python: 3.8
     - env: TOXENV=docs
       python: 3.6
diff --git a/docs/contributing.rst b/docs/contributing.rst
index eaaf86c29..3aebb3d50 100644
--- a/docs/contributing.rst
+++ b/docs/contributing.rst
@@ -203,17 +203,9 @@ Tests are implemented using the :doc:`Twisted unit-testing framework
 Running tests
 -------------
 
-Make sure you have a recent enough :doc:`tox <tox:index>` installation:
+To run all tests::
 
-    ``tox --version``
-
-If your version is older than 1.7.0, please update it first:
-
-    ``pip install -U tox``
-
-To run all tests go to the root directory of Scrapy source code and run:
-
-    ``tox``
+    tox
 
 To run a specific test (say ``tests/test_loader.py``) use:
 
diff --git a/tox.ini b/tox.ini
index f37c381d0..72e40696b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,8 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py35
+envlist = security,flake8,py3
+minversion = 1.7.0
 
 [testenv]
 deps =
@@ -22,11 +23,28 @@ passenv =
 commands =
     py.test --cov=scrapy --cov-report= {posargs:--durations=10 docs scrapy tests}
 
-[testenv:py35]
-basepython = python3.5
+[testenv:security]
+basepython = python3
+deps =
+    bandit
+commands =
+    bandit -r -c .bandit.yml {posargs:scrapy}
 
-[testenv:py35-pinned]
-basepython = python3.5
+[testenv:flake8]
+basepython = python3
+deps =
+    {[testenv]deps}
+    pytest-flake8
+commands =
+    py.test --flake8 {posargs:docs scrapy tests}
+
+[testenv:pypy3]
+basepython = pypy3
+commands =
+    py.test {posargs:--durations=10 docs scrapy tests}
+
+[testenv:pinned]
+basepython = python3
 deps =
     -ctests/constraints.txt
     cryptography==2.0
@@ -47,34 +65,11 @@ deps =
     botocore==1.3.23
     Pillow==3.4.2
 
-[testenv:py36]
-basepython = python3.6
-
-[testenv:py37]
-basepython = python3.7
-
-[testenv:py38]
-basepython = python3.8
-
-[testenv:pypy3]
-basepython = pypy3
-commands =
-    py.test {posargs:--durations=10 docs scrapy tests}
-
-[testenv:security]
-basepython = python3.8
-deps =
-    bandit
-commands =
-    bandit -r -c .bandit.yml {posargs:scrapy}
-
-[testenv:flake8]
-basepython = python3.8
+[testenv:extra-deps]
 deps =
     {[testenv]deps}
-    pytest-flake8
-commands =
-    py.test --flake8 {posargs:docs scrapy tests}
+    reppy
+    robotexclusionrulesparser
 
 [docs]
 changedir = docs
@@ -98,10 +93,3 @@ changedir = {[docs]changedir}
 deps = {[docs]deps}
 commands =
     sphinx-build -W -b linkcheck . {envtmpdir}/linkcheck
-
-[testenv:py38-extra-deps]
-basepython = python3.8
-deps =
-    {[testenv]deps}
-    reppy
-    robotexclusionrulesparser