diff --git a/requirements.txt b/requirements.txt
index a063e13..176749d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,54 +10,54 @@ atomicwrites==1.3.0       # via pytest
 attrs==19.1.0             # via pytest
 babel==2.6.0              # via sphinx
 backcall==0.1.0           # via ipython
-bleach==3.1.0             # via readme-renderer
+bleach==3.1.4             # via readme-renderer
 certifi==2019.3.9         # via requests
 chardet==3.0.4            # via requests
 click==7.0                # via pip-tools
-cloudpickle==0.8.0
+cloudpickle==0.8.0        # via -r requirements.in, sanitized-package
 decorator==4.3.2          # via ipython, traitlets
 docutils==0.14            # via readme-renderer, sphinx
 idna==2.8                 # via requests
 imagesize==1.1.0          # via sphinx
 ipython-genutils==0.2.0   # via traitlets
-ipython==7.3.0
+ipython==7.3.0            # via -r requirements.in
 jedi==0.13.3              # via ipython
 jinja2==2.10              # via sphinx
 markupsafe==1.1.1         # via jinja2
 more-itertools==6.0.0     # via pytest
 mypy-extensions==0.4.1    # via mypy
-mypy==0.670
+mypy==0.670               # via -r requirements.in
 packaging==19.0           # via sphinx
 parso==0.3.4              # via jedi
 pexpect==4.6.0            # via ipython
 pickleshare==0.7.5        # via ipython
-pip-tools==3.4.0
+pip-tools==3.4.0          # via -r requirements.in
 pkginfo==1.5.0.1          # via twine
 pluggy==0.9.0             # via pytest
 prompt-toolkit==2.0.9     # via ipython
-psutil==5.6.1
+psutil==5.6.1             # via -r requirements.in, sanitized-package
 ptyprocess==0.6.0         # via pexpect
 py==1.8.0                 # via pytest
 pygments==2.3.1           # via ipython, readme-renderer, sphinx
 pyparsing==2.3.1          # via packaging
-pytest-repeat==0.8.0
-pytest==4.3.0
+pytest-repeat==0.8.0      # via -r requirements.in
+pytest==4.3.0             # via -r requirements.in, pytest-repeat
 pytz==2018.9              # via babel
-pyzmq==18.0.1
+pyzmq==18.0.1             # via -r requirements.in, sanitized-package
 readme-renderer==24.0     # via twine
 requests-toolbelt==0.9.1  # via twine
 requests==2.21.0          # via requests-toolbelt, sphinx, twine
 six==1.12.0               # via bleach, packaging, pip-tools, prompt-toolkit, pytest, readme-renderer, sphinx, traitlets
 snowballstemmer==1.2.1    # via sphinx
-sphinx-rtd-theme==0.4.3
-sphinx==1.8.5
+sphinx-rtd-theme==0.4.3   # via -r requirements.in
+sphinx==1.8.5             # via -r requirements.in, sphinx-rtd-theme
 sphinxcontrib-websupport==1.1.0  # via sphinx
-tblib==1.3.2
+tblib==1.3.2              # via -r requirements.in, sanitized-package
 tqdm==4.31.1              # via twine
 traitlets==4.3.2          # via ipython
-twine==1.13.0
+twine==1.13.0             # via -r requirements.in
 typed-ast==1.3.1          # via mypy
 urllib3==1.24.2           # via requests
 wcwidth==0.1.7            # via prompt-toolkit
 webencodings==0.5.1       # via bleach
-yappi==1.0
+yappi==1.0                # via -r requirements.in