diff --git a/dstc8_reddit/tasks/packaging.py b/dstc8_reddit/tasks/packaging.py
index f530f80..65945e6 100644
--- a/dstc8_reddit/tasks/packaging.py
+++ b/dstc8_reddit/tasks/packaging.py
@@ -135,7 +135,7 @@ class ZipDataset(luigi.Task):
 
   def run(self):
     with self.output().temporary_path() as zip_path:
-      archive = ZipFile(zip_path, 'w', compression=ZIP_DEFLATED, compresslevel=9)
+      archive = ZipFile(zip_path, 'w', compression=ZIP_DEFLATED)
       for src in self.input():
         if os.stat(src.path).st_size == 0:
           continue
diff --git a/scripts/reddit.py b/scripts/reddit.py
old mode 100644
new mode 100755
diff --git a/setup.py b/setup.py
index 8ca014f..fc0e90d 100644
--- a/setup.py
+++ b/setup.py
@@ -38,7 +38,7 @@ setup(
   classifiers=[
       'Programming Language :: Python :: 3',
   ],
-  python_requires='>=3.5',
+  python_requires='>=3.6',
   install_requires=INSTALL_REQUIRES,
   tests_require=TEST_REQUIRES,
   extras_require=dict(