diff --git a/ci/requirements-3.6_NUMPY_DEV.build b/ci/requirements-3.6_NUMPY_DEV.build
index 738366867a217..900c050f1cc9e 100644
--- a/ci/requirements-3.6_NUMPY_DEV.build
+++ b/ci/requirements-3.6_NUMPY_DEV.build
@@ -1,4 +1,3 @@
 python=3.6*
-python-dateutil
 pytz
 cython
diff --git a/ci/requirements-3.6_NUMPY_DEV.build.sh b/ci/requirements-3.6_NUMPY_DEV.build.sh
index 4af1307f26a18..90ed04f8f0c17 100644
--- a/ci/requirements-3.6_NUMPY_DEV.build.sh
+++ b/ci/requirements-3.6_NUMPY_DEV.build.sh
@@ -11,4 +11,7 @@ pip uninstall numpy -y
 PRE_WHEELS="https://7933911d6844c6c53a7d-47bd50c35cd79bd838daf386af554a83.ssl.cf2.rackcdn.com"
 pip install --pre --upgrade --timeout=60 -f $PRE_WHEELS numpy scipy
 
+# install dateutil from master
+pip install -U git+git://github.com/dateutil/dateutil.git
+
 true