diff --git a/.travis.yml b/.travis.yml
index 6455437..98177be 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,7 +9,10 @@ matrix:
         - python: "3.7-dev"
 
 # command to install dependencies
-install: pip install pipenv; pipenv lock; pipenv install --dev
+install:
+    - pip install pipenv
+    - pipenv install '-e .' --skip-lock --ignore-pipfile
+    - pipenv install --dev --skip-lock
 
 # command to run tests
 script: pipenv run pytest tests/
diff --git a/Pipfile b/Pipfile
index 816c9f9..fd7b839 100644
--- a/Pipfile
+++ b/Pipfile
@@ -2,11 +2,3 @@
 freezegun = "*"
 pytest = "*"
 sphinx = "*"
-
-[packages]
-humanize = "*"
-pytz = "*"
-dateparser = ">=0.7.0"
-tzlocal = "*"
-pendulum = ">=1.0"
-snaptime = "*"