diff --git a/requirements_dev.txt b/requirements_dev.txt
index d82e3e2..f41cf4d 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -4,49 +4,119 @@
 #
 #    pip-compile --no-index --output-file requirements_dev.txt requirements_dev.in
 #
-alabaster==0.7.10         # via sphinx
-astroid==1.5.3            # via pylint
-babel==2.4.0              # via sphinx
-backports.functools-lru-cache==1.4  # via astroid, pylint
-backports.ssl-match-hostname==3.5.0.1  # via docker
+alabaster==0.7.10
+    # via sphinx
+astroid==1.5.3
+    # via pylint
+babel==2.4.0
+    # via sphinx
+backports.functools-lru-cache==1.4
+    # via
+    #   astroid
+    #   pylint
+backports.ssl-match-hostname==3.5.0.1
+    # via docker
 bumpversion==0.5.3
-certifi==2017.4.17        # via requests
-chardet==3.0.4            # via requests
+    # via -r requirements_dev.in
+certifi==2017.4.17
+    # via requests
+chardet==3.0.4
+    # via requests
 codecov==2.0.9
-configparser==3.5.0       # via pylint
-coverage==4.4.1           # via codecov, pytest-cov
-docker-pycreds==0.2.1     # via docker
+    # via -r requirements_dev.in
+configparser==3.5.0
+    # via pylint
+coverage==4.4.1
+    # via
+    #   codecov
+    #   pytest-cov
+docker-pycreds==0.2.1
+    # via docker
 docker==2.4.2
-docutils==0.13.1          # via sphinx
-enum34==1.1.6             # via astroid
-funcsigs==1.0.2           # via mock
-idna==2.5                 # via requests
-imagesize==0.7.1          # via sphinx
-ipaddress==1.0.18         # via docker
-isort==4.2.15             # via pylint
-jinja2==2.9.6             # via sphinx
-lazy-object-proxy==1.3.1  # via astroid
-markupsafe==1.0           # via jinja2
-mccabe==0.6.1             # via pylint
+    # via -r requirements_dev.in
+docutils==0.13.1
+    # via sphinx
+enum34==1.1.6
+    # via astroid
+funcsigs==1.0.2
+    # via mock
+idna==2.5
+    # via requests
+imagesize==0.7.1
+    # via sphinx
+ipaddress==1.0.18
+    # via docker
+isort==4.2.15
+    # via pylint
+jinja2==2.9.6
+    # via sphinx
+lazy-object-proxy==1.3.1
+    # via astroid
+markupsafe==1.0
+    # via jinja2
+mccabe==0.6.1
+    # via pylint
 mock==2.0.0
-pbr==3.1.1                # via mock
-pluggy==0.4.0             # via tox
-py==1.4.34                # via pytest, tox
-pygments==2.2.0           # via sphinx
+    # via
+    #   -r requirements_dev.in
+    #   pytest-mock
+pbr==3.1.1
+    # via mock
+pluggy==0.4.0
+    # via tox
+py==1.10.0
+    # via
+    #   pytest
+    #   tox
+pygments==2.2.0
+    # via sphinx
 pylint==1.7.2
+    # via -r requirements_dev.in
 pytest-cov==2.5.1
+    # via -r requirements_dev.in
 pytest-mock==1.6.0
+    # via -r requirements_dev.in
 pytest==3.1.2
-pytz==2017.2              # via babel
-requests==2.18.1          # via codecov, docker, sphinx
-singledispatch==3.4.0.3   # via astroid, pylint
-six==1.10.0               # via astroid, docker, docker-pycreds, mock, pylint, singledispatch, sphinx, websocket-client
-snowballstemmer==1.2.1    # via sphinx
+    # via
+    #   -r requirements_dev.in
+    #   pytest-cov
+    #   pytest-mock
+pytz==2017.2
+    # via babel
+requests==2.18.1
+    # via
+    #   codecov
+    #   docker
+    #   sphinx
+singledispatch==3.4.0.3
+    # via
+    #   astroid
+    #   pylint
+six==1.10.0
+    # via
+    #   astroid
+    #   docker
+    #   docker-pycreds
+    #   mock
+    #   pylint
+    #   singledispatch
+    #   sphinx
+    #   websocket-client
+snowballstemmer==1.2.1
+    # via sphinx
 sphinx==1.6.3
-sphinxcontrib-websupport==1.0.1  # via sphinx
+    # via -r requirements_dev.in
+sphinxcontrib-websupport==1.0.1
+    # via sphinx
 tox==2.7.0
-typing==3.6.1             # via sphinx
-urllib3==1.21.1           # via requests
-virtualenv==15.1.0        # via tox
-websocket-client==0.44.0  # via docker
-wrapt==1.10.10            # via astroid
+    # via -r requirements_dev.in
+typing==3.6.1
+    # via sphinx
+urllib3==1.21.1
+    # via requests
+virtualenv==15.1.0
+    # via tox
+websocket-client==0.44.0
+    # via docker
+wrapt==1.10.10
+    # via astroid