diff --git a/tools/create_jctf_tests.py b/tools/create_jctf_tests.py
index bc065d9..38e1f9c 100755
--- a/tools/create_jctf_tests.py
+++ b/tools/create_jctf_tests.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2017, the R8 project authors. Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
@@ -9,7 +9,7 @@
 from os import makedirs
 from os.path import exists, join, dirname
 from shutil import rmtree
-from string import Template, upper
+from string import Template
 import os
 import re
 import sys
diff --git a/tools/download_from_x20.py b/tools/download_from_x20.py
index 5f64684..5796823 100755
--- a/tools/download_from_x20.py
+++ b/tools/download_from_x20.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2016, the R8 project authors. Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
@@ -20,7 +20,7 @@
   return optparse.OptionParser().parse_args()
 
 def download(src, dest):
-  print 'Downloading %s to %s' % (src, dest)
+  print('Downloading %s to %s' % (src, dest))
   shutil.copyfile(src, dest)
   utils.unpack_archive(dest)
 
@@ -29,21 +29,21 @@
   assert len(args) == 1
   sha1_file = args[0]
   dest = sha1_file[:-5]
-  print 'Ensuring %s' % dest
+  print('Ensuring %s' % dest)
   with open(sha1_file, 'r') as input_sha:
     sha1 = input_sha.readline()
   if os.path.exists(dest) and utils.get_sha1(dest) == sha1:
-    print 'sha1 matches, not downloading'
+    print('sha1 matches, not downloading')
     dest_dir = utils.extract_dir(dest)
     if os.path.exists(dest_dir):
-      print 'destination directory exists, no extraction'
+      print('destination directory exists, no extraction')
     else:
       utils.unpack_archive(dest)
     return
   src = os.path.join(GMSCORE_DEPS, sha1)
   if not os.path.exists(src):
-    print 'File (%s) does not exist on x20' % src
-    print 'Maybe pass -Pno_internal to your gradle invocation'
+    print('File (%s) does not exist on x20' % src)
+    print('Maybe pass -Pno_internal to your gradle invocation')
     return 42
   download(src, dest)