diff --git a/dev.in b/dev.in
index 11346610..2c47385d 100644
--- a/dev.in
+++ b/dev.in
@@ -1,5 +1,8 @@
 -r requirements.in
 
+# See https://github.com/jazzband/pip-tools/issues/721
+poetry
+
 ipdb
 ipython
 isort
diff --git a/dev.txt b/dev.txt
index c9214bac..c8a8529b 100644
--- a/dev.txt
+++ b/dev.txt
@@ -5,15 +5,22 @@
 #    pip-compile dev.in
 #
 appnope==0.1.0            # via ipython
+attrs==19.3.0             # via jsonschema
 backcall==0.1.0           # via ipython
+cachecontrol[filecache]==0.12.6  # via poetry
+cachy==0.3.0              # via poetry
 certifi==2019.11.28       # via requests
 chardet==3.0.4            # via requests
+cleo==0.7.6               # via poetry
 click==7.0                # via flask, pip-tools
+clikit==0.4.1             # via cleo, poetry
 decorator==4.4.1          # via ipython, traitlets
 eventbrite==3.3.3
 flask-sslify==0.1.5
 flask==1.1.1
+html5lib==1.0.1           # via poetry
 idna==2.8                 # via requests
+importlib-metadata==1.1.3  # via jsonschema, keyring, poetry
 ipdb==0.12.3
 ipython-genutils==0.2.0   # via traitlets
 ipython==7.11.1
@@ -21,26 +28,42 @@ isort==4.3.21
 itsdangerous==1.1.0       # via flask
 jedi==0.15.2              # via ipython
 jinja2==2.10.3
+jsonschema==3.2.0         # via poetry
+keyring==20.0.1           # via poetry
+lockfile==0.12.2          # via cachecontrol
 markupsafe==1.1.1         # via jinja2
+more-itertools==8.1.0     # via zipp
+msgpack==0.6.2            # via cachecontrol
 parso==0.5.2              # via jedi
+pastel==0.1.1             # via clikit
 pendulum==2.0.5
-pexpect==4.7.0            # via ipython
+pexpect==4.7.0            # via ipython, poetry
 pickleshare==0.7.5        # via ipython
 pip-tools==4.3.0
+pkginfo==1.5.0.1          # via poetry
+poetry==1.0.2
 prompt-toolkit==3.0.2     # via ipython
 ptyprocess==0.6.0         # via pexpect
 pygments==2.5.2           # via ipython
+pylev==1.3.0              # via clikit
+pyparsing==2.4.6          # via poetry
+pyrsistent==0.14.11       # via jsonschema, poetry
 python-dateutil==2.8.1    # via pendulum
-python-dotenv==0.10.3
+python-dotenv==0.10.4
 python-http-client==3.2.1  # via sendgrid
 pytzdata==2019.3          # via pendulum
+requests-toolbelt==0.8.0  # via poetry
 requests==2.22.0
 sendgrid==6.1.0
-six==1.13.0               # via pip-tools, python-dateutil, traitlets
+shellingham==1.3.1        # via poetry
+six==1.14.0               # via html5lib, jsonschema, pip-tools, pyrsistent, python-dateutil, traitlets
+tomlkit==0.5.8            # via poetry
 traitlets==4.3.3          # via ipython
 urllib3==1.25.7           # via requests
 wcwidth==0.1.8            # via prompt-toolkit
+webencodings==0.5.1       # via html5lib
 werkzeug==0.16.0          # via flask
+zipp==1.0.0               # via importlib-metadata
 
 # The following packages are considered to be unsafe in a requirements file:
 # setuptools
diff --git a/requirements.txt b/requirements.txt
index 81d634cc..8e30b5c4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,11 +17,11 @@ markupsafe==1.1.1         # via jinja2
 pendulum==2.0.5
 pip-tools==4.3.0
 python-dateutil==2.8.1    # via pendulum
-python-dotenv==0.10.3
+python-dotenv==0.10.4
 python-http-client==3.2.1  # via sendgrid
 pytzdata==2019.3          # via pendulum
 requests==2.22.0
 sendgrid==6.1.0
-six==1.13.0               # via pip-tools, python-dateutil
+six==1.14.0               # via pip-tools, python-dateutil
 urllib3==1.25.7           # via requests
 werkzeug==0.16.0          # via flask