diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 13e67a66114020e1b2b45fe901a9604160860964..51c2fffa23a7c14b2cd51ebd47416523fddc5942 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -2,6 +2,7 @@ image: $DOCKER_REGISTRY/pdsl/rdiffweb-build:$CI_PIPELINE_IID
 
 variables:
     PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
+    PIP_INDEX_URL: https://nexus.patrikdufresne.com/repository/pypi-proxy/simple/
 
 stages:
 - prebuild
diff --git a/setup.py b/setup.py
index 56d314bc56b20edb69b4f7301bc1dd8bfca0cfb5..6c0cd0d409d18d12c1c7fdb207d728e9485957ef 100644
--- a/setup.py
+++ b/setup.py
@@ -177,6 +177,19 @@ else:
         "python-ldap",
     ]
 
+setup_requires=[
+    "babel>=0.9.6",
+    "setuptools_scm",
+    "minify",
+]
+tests_require=[
+    "mock>=1.3.0",
+    "coverage>=4.0.1",
+    "mockldap>=0.2.6",
+    "pytest<5.0.0",
+]
+extras_require={'tox': tests_require}
+
 long_description_content_type = long_description = None
 with open(os.path.join(os.path.dirname(__file__), 'README.md')) as f:
     long_description = f.read()
@@ -206,18 +219,10 @@ setup(
     },
     install_requires=install_requires,
     # required packages for build process
-    setup_requires=[
-        "babel>=0.9.6",
-        "minify",
-        "setuptools_scm",
-    ],
+    setup_requires=setup_requires,
     # requirement for testing
-    tests_require=[
-        "mock>=1.3.0",
-        "coverage>=4.0.1",
-        "mockldap>=0.2.6",
-        "pytest<5.0.0",
-    ],
+    tests_require=tests_require,
+    extras_require=extras_require,
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Intended Audience :: System Administrators',
diff --git a/tox.ini b/tox.ini
index 46654722af12b0d7934c7b039b088f750a7caa8b..2745f314ba4115f1c1a6d9504e61bc9a7154da28 100644
--- a/tox.ini
+++ b/tox.ini
@@ -41,4 +41,5 @@ deps=
   cherrypy16: cherrypy>=16.0.0,<17.0.0
   cherrypy17: cherrypy>=17.0.0,<18.0.0
   cherrypy18: cherrypy>=18.0.0,<19.0.0
+commands_pre=pip install -e .[tox]
 commands=python setup.py nosetests --xunit-file=nosetests-{envname}.xml --xunit-testsuite-name={envname} --cover-xml-file=coverage-{envname}.xml