diff --git a/ci/environment-dev.yaml b/ci/environment-dev.yaml
index c72abd0c19516..1337fc54e9aac 100644
--- a/ci/environment-dev.yaml
+++ b/ci/environment-dev.yaml
@@ -5,6 +5,7 @@ channels:
 dependencies:
   - Cython
   - NumPy
+  - flake8
   - moto
   - pytest>=3.1
   - python-dateutil>=2.5.0
diff --git a/ci/requirements_dev.txt b/ci/requirements_dev.txt
index 82f8de277c57b..fcbe0da5de305 100644
--- a/ci/requirements_dev.txt
+++ b/ci/requirements_dev.txt
@@ -2,9 +2,10 @@
 # Do not modify directly
 Cython
 NumPy
+flake8
 moto
 pytest>=3.1
 python-dateutil>=2.5.0
 pytz
 setuptools>=3.3
-sphinx
+sphinx
\ No newline at end of file