diff --git a/repo2docker/buildpacks/julia/__init__.py b/repo2docker/buildpacks/julia/__init__.py
index e138e251..26f7c7a0 100644
--- a/repo2docker/buildpacks/julia/__init__.py
+++ b/repo2docker/buildpacks/julia/__init__.py
@@ -29,7 +29,7 @@ class JuliaBuildPack(CondaBuildPack):
             with open(require) as f:
                 julia_version_line = f.readline().strip()  # First line is optionally a julia version
         except FileNotFoundError:
-             julia_version_line = ''
+            julia_version_line = ''
 
         if not julia_version_line.startswith('julia '):
             # not a Julia version line.
@@ -144,7 +144,7 @@ class JuliaBuildPack(CondaBuildPack):
             # The precompliation is done via `using {libraryname}`.
             r"""
             julia /tmp/install-repo-dependencies.jl "%(require)s"
-            """ % { "require" : require }
+            """ % {"require": require}
             # TODO: For some reason, `rm`ing the file fails with permission denied.
             # && rm /tmp/install-repo-dependencies.jl
         )]
diff --git a/repo2docker/utils.py b/repo2docker/utils.py
index 7df5ae8d..9d75d1cf 100644
--- a/repo2docker/utils.py
+++ b/repo2docker/utils.py
@@ -3,7 +3,6 @@ from functools import partial
 import re
 import shutil
 import subprocess
-import sys
 
 from traitlets import Integer, TraitError
 
diff --git a/tests/test_clone_depth.py b/tests/test_clone_depth.py
index 6038bd5e..5067df3f 100644
--- a/tests/test_clone_depth.py
+++ b/tests/test_clone_depth.py
@@ -7,8 +7,6 @@ and that is the only thing that is tested.
 
 """
 import subprocess
-import requests
-import time
 from repo2docker.app import Repo2Docker