diff --git a/requirements.txt b/requirements.txt
index 495687b..a43d63b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,30 +4,61 @@
 #
 #    pip-compile requirements.in -o requirements.txt
 #
-alabaster==0.7.12         # via sphinx
-babel==2.6.0              # via sphinx
-certifi==2019.3.9         # via requests
-chardet==3.0.4            # via requests
-commonmark==0.8.1         # via recommonmark
-docutils==0.14            # via recommonmark, sphinx
-future==0.17.1            # via commonmark
-idna==2.8                 # via requests
-imagesize==1.1.0          # via sphinx
-jinja2==2.10.1            # via sphinx
-markupsafe==1.1.1         # via jinja2
-packaging==19.0           # via sphinx
-pygments==2.3.1           # via sphinx
-pyparsing==2.4.0          # via packaging
-pytz==2019.1              # via babel
+alabaster==0.7.12
+    # via sphinx
+babel==2.6.0
+    # via sphinx
+certifi==2019.3.9
+    # via requests
+chardet==3.0.4
+    # via requests
+commonmark==0.8.1
+    # via recommonmark
+docutils==0.14
+    # via
+    #   recommonmark
+    #   sphinx
+future==0.17.1
+    # via commonmark
+idna==2.8
+    # via requests
+imagesize==1.1.0
+    # via sphinx
+jinja2==2.11.3
+    # via sphinx
+markupsafe==1.1.1
+    # via jinja2
+packaging==19.0
+    # via sphinx
+pygments==2.3.1
+    # via sphinx
+pyparsing==2.4.0
+    # via packaging
+pytz==2019.1
+    # via babel
 recommonmark==0.5.0
-requests==2.21.0          # via sphinx
-six==1.12.0               # via packaging
-snowballstemmer==1.2.1    # via sphinx
+    # via -r requirements.in
+requests==2.21.0
+    # via sphinx
+six==1.12.0
+    # via packaging
+snowballstemmer==1.2.1
+    # via sphinx
 sphinx==2.0.1
-sphinxcontrib-applehelp==1.0.1  # via sphinx
-sphinxcontrib-devhelp==1.0.1  # via sphinx
-sphinxcontrib-htmlhelp==1.0.2  # via sphinx
-sphinxcontrib-jsmath==1.0.1  # via sphinx
-sphinxcontrib-qthelp==1.0.2  # via sphinx
-sphinxcontrib-serializinghtml==1.1.3  # via sphinx
-urllib3==1.24.2           # via requests
+    # via
+    #   -r requirements.in
+    #   recommonmark
+sphinxcontrib-applehelp==1.0.1
+    # via sphinx
+sphinxcontrib-devhelp==1.0.1
+    # via sphinx
+sphinxcontrib-htmlhelp==1.0.2
+    # via sphinx
+sphinxcontrib-jsmath==1.0.1
+    # via sphinx
+sphinxcontrib-qthelp==1.0.2
+    # via sphinx
+sphinxcontrib-serializinghtml==1.1.3
+    # via sphinx
+urllib3==1.24.2
+    # via requests