diff --git a/repo2docker/app.py b/repo2docker/app.py
index 5feba05a..a2a9a92d 100755
--- a/repo2docker/app.py
+++ b/repo2docker/app.py
@@ -16,7 +16,6 @@
 import sys
 import tempfile
 import time
-import warnings
 from urllib.parse import urlparse
 
 import entrypoints
diff --git a/repo2docker/buildpacks/conda/__init__.py b/repo2docker/buildpacks/conda/__init__.py
index a9c6670e..57f5d2ab 100644
--- a/repo2docker/buildpacks/conda/__init__.py
+++ b/repo2docker/buildpacks/conda/__init__.py
@@ -2,7 +2,6 @@
 
 import os
 import re
-import warnings
 from collections.abc import Mapping
 from functools import lru_cache