diff --git a/tools/adb.py b/tools/adb.py
index 07ca034..2e015a0 100644
--- a/tools/adb.py
+++ b/tools/adb.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2020, 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.
diff --git a/tools/api_sample_coverage.py b/tools/api_sample_coverage.py
index 4eea8c7..2d9b0d2 100755
--- a/tools/api_sample_coverage.py
+++ b/tools/api_sample_coverage.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/apk_masseur.py b/tools/apk_masseur.py
index b1ea43e..b363bb7 100755
--- a/tools/apk_masseur.py
+++ b/tools/apk_masseur.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.
diff --git a/tools/archive.py b/tools/archive.py
index 1983f55..6eada3d 100755
--- a/tools/archive.py
+++ b/tools/archive.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.
diff --git a/tools/archive_desugar_jdk_libs.py b/tools/archive_desugar_jdk_libs.py
index 4ee7387..3a9cfd6 100755
--- a/tools/archive_desugar_jdk_libs.py
+++ b/tools/archive_desugar_jdk_libs.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2019, 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.
diff --git a/tools/as_utils.py b/tools/as_utils.py
index 4087137..3c69d10 100644
--- a/tools/as_utils.py
+++ b/tools/as_utils.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/asmifier.py b/tools/asmifier.py
index 3fec231..1a8e4ac 100755
--- a/tools/asmifier.py
+++ b/tools/asmifier.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/benchmarks/get_deps.py b/tools/benchmarks/get_deps.py
index cd28efe..716db48 100644
--- a/tools/benchmarks/get_deps.py
+++ b/tools/benchmarks/get_deps.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.
diff --git a/tools/build_aosp.py b/tools/build_aosp.py
index b62ec02..5475830 100755
--- a/tools/build_aosp.py
+++ b/tools/build_aosp.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.
diff --git a/tools/build_r8lib.py b/tools/build_r8lib.py
index 980715e..8dc0cb8 100755
--- a/tools/build_r8lib.py
+++ b/tools/build_r8lib.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/build_sample_apk.py b/tools/build_sample_apk.py
index 376c5c0..67ead8c 100755
--- a/tools/build_sample_apk.py
+++ b/tools/build_sample_apk.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/checkout_aosp.py b/tools/checkout_aosp.py
index 268b1b3..36a5333 100755
--- a/tools/checkout_aosp.py
+++ b/tools/checkout_aosp.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.
diff --git a/tools/compare_apk_sizes.py b/tools/compare_apk_sizes.py
index 9a56187..895633e 100755
--- a/tools/compare_apk_sizes.py
+++ b/tools/compare_apk_sizes.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/compare_cts_results.py b/tools/compare_cts_results.py
index 00901ec..0da116d 100755
--- a/tools/compare_cts_results.py
+++ b/tools/compare_cts_results.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.
diff --git a/tools/compatdx.py b/tools/compatdx.py
index c4cb320..d58b907 100755
--- a/tools/compatdx.py
+++ b/tools/compatdx.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.
diff --git a/tools/compatproguard.py b/tools/compatproguard.py
index 10542e3..7c56549 100755
--- a/tools/compatproguard.py
+++ b/tools/compatproguard.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/compiledump.py b/tools/compiledump.py
index a810cdc..a7809ac 100755
--- a/tools/compiledump.py
+++ b/tools/compiledump.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2020, 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.
diff --git a/tools/create_art_tests.py b/tools/create_art_tests.py
index a64fe71..0c59ae9 100755
--- a/tools/create_art_tests.py
+++ b/tools/create_art_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.
diff --git a/tools/create_dx_replay.py b/tools/create_dx_replay.py
index cb27a30..8dfb0a0 100755
--- a/tools/create_dx_replay.py
+++ b/tools/create_dx_replay.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.
@@ -81,7 +81,7 @@
 
   # create the first lines of the replay script
   replay_script = \
-"""#!/usr/bin/env python
+"""#!/usr/bin/env python3
 import os
 import shutil
 import subprocess
diff --git a/tools/create_maven_release.py b/tools/create_maven_release.py
index e53265c..b233257 100755
--- a/tools/create_maven_release.py
+++ b/tools/create_maven_release.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.
diff --git a/tools/d8.py b/tools/d8.py
index 833f7f5..766e690 100755
--- a/tools/d8.py
+++ b/tools/d8.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.
diff --git a/tools/d8logger.py b/tools/d8logger.py
index 9fb3508..b523294 100755
--- a/tools/d8logger.py
+++ b/tools/d8logger.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/dex2oat.py b/tools/dex2oat.py
index e21dc7d..7c5a31e 100755
--- a/tools/dex2oat.py
+++ b/tools/dex2oat.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/dexfilemerger.py b/tools/dexfilemerger.py
index 7bdfc22..de4e6ae 100755
--- a/tools/dexfilemerger.py
+++ b/tools/dexfilemerger.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/dexsegments.py b/tools/dexsegments.py
index f984063..7b901de 100755
--- a/tools/dexsegments.py
+++ b/tools/dexsegments.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/dexsplitter.py b/tools/dexsplitter.py
index 415b149..a97d089 100755
--- a/tools/dexsplitter.py
+++ b/tools/dexsplitter.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/disasm.py b/tools/disasm.py
index 368a78f..e37ac4c 100755
--- a/tools/disasm.py
+++ b/tools/disasm.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/download_all_benchmark_dependencies.py b/tools/download_all_benchmark_dependencies.py
index ab29ebd..ed940a3 100755
--- a/tools/download_all_benchmark_dependencies.py
+++ b/tools/download_all_benchmark_dependencies.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2019, 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.
diff --git a/tools/download_kotlin_dev.py b/tools/download_kotlin_dev.py
index 6360cd2..5d2696a 100755
--- a/tools/download_kotlin_dev.py
+++ b/tools/download_kotlin_dev.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2021, 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.
diff --git a/tools/emulator_aosp.py b/tools/emulator_aosp.py
index f63c673..d5f80dc 100755
--- a/tools/emulator_aosp.py
+++ b/tools/emulator_aosp.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.
diff --git a/tools/extractmarker.py b/tools/extractmarker.py
index 36a9c88..b50a2fd 100755
--- a/tools/extractmarker.py
+++ b/tools/extractmarker.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/find_haning_test.py b/tools/find_haning_test.py
index 29e78aa..786fbcf 100755
--- a/tools/find_haning_test.py
+++ b/tools/find_haning_test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2019, 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.
diff --git a/tools/git_sync_cl_chain.py b/tools/git_sync_cl_chain.py
index 09da33e..7dc512e 100755
--- a/tools/git_sync_cl_chain.py
+++ b/tools/git_sync_cl_chain.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2019, 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.
diff --git a/tools/git_utils.py b/tools/git_utils.py
index 9d9c6bd..1e3e7c5 100644
--- a/tools/git_utils.py
+++ b/tools/git_utils.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2019, 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.
diff --git a/tools/golem.py b/tools/golem.py
index eb9bbee..6a4e399 100755
--- a/tools/golem.py
+++ b/tools/golem.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/golem_build.py b/tools/golem_build.py
index c691293..e9de5eb 100755
--- a/tools/golem_build.py
+++ b/tools/golem_build.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/historic_memory_usage.py b/tools/historic_memory_usage.py
index bb08a2e..3ef2268 100755
--- a/tools/historic_memory_usage.py
+++ b/tools/historic_memory_usage.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2019, 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.
diff --git a/tools/historic_run.py b/tools/historic_run.py
index b0f181f..eaaadd5 100755
--- a/tools/historic_run.py
+++ b/tools/historic_run.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2019, 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.
diff --git a/tools/inspect.py b/tools/inspect.py
index 6d655da..80c1ecd 100755
--- a/tools/inspect.py
+++ b/tools/inspect.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/internal_test.py b/tools/internal_test.py
index 8f4f10e..2f30486 100755
--- a/tools/internal_test.py
+++ b/tools/internal_test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/jardiff.py b/tools/jardiff.py
index 894131c..18587ab 100755
--- a/tools/jardiff.py
+++ b/tools/jardiff.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/java.py b/tools/java.py
index 3abfcdd..fb0ef13 100755
--- a/tools/java.py
+++ b/tools/java.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2019, 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.
diff --git a/tools/javac.py b/tools/javac.py
index 0d8ac05..242fac0 100755
--- a/tools/javac.py
+++ b/tools/javac.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2019, 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.
diff --git a/tools/jdk.py b/tools/jdk.py
index b3af7a6..23cacc8 100755
--- a/tools/jdk.py
+++ b/tools/jdk.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2019, 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.
diff --git a/tools/keeprule_benchmark.py b/tools/keeprule_benchmark.py
index 0a7e063..4b843c6 100755
--- a/tools/keeprule_benchmark.py
+++ b/tools/keeprule_benchmark.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2020, 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.
diff --git a/tools/maindex.py b/tools/maindex.py
index ff5329a..735ced5 100755
--- a/tools/maindex.py
+++ b/tools/maindex.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/maven_mirror.py b/tools/maven_mirror.py
index 43ca31e..8a7f4aa 100755
--- a/tools/maven_mirror.py
+++ b/tools/maven_mirror.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2019, 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.
diff --git a/tools/minify_tool.py b/tools/minify_tool.py
index a512665..cef72e5 100755
--- a/tools/minify_tool.py
+++ b/tools/minify_tool.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/notify.py b/tools/notify.py
index b195357..34676ba 100644
--- a/tools/notify.py
+++ b/tools/notify.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.
diff --git a/tools/performance_try.py b/tools/performance_try.py
index 5830cea..0c09e70 100755
--- a/tools/performance_try.py
+++ b/tools/performance_try.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/printseeds.py b/tools/printseeds.py
index 4f389d5..6c0ee8c 100755
--- a/tools/printseeds.py
+++ b/tools/printseeds.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/printuses.py b/tools/printuses.py
index 17d3df1..5253796 100755
--- a/tools/printuses.py
+++ b/tools/printuses.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/proguard.py b/tools/proguard.py
index 5984622..057c16c 100755
--- a/tools/proguard.py
+++ b/tools/proguard.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.
diff --git a/tools/r8.py b/tools/r8.py
index 60c60a0..31abcf6 100755
--- a/tools/r8.py
+++ b/tools/r8.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.
diff --git a/tools/r8bisect.py b/tools/r8bisect.py
index 74c880e..1b35eb3 100755
--- a/tools/r8bisect.py
+++ b/tools/r8bisect.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.
diff --git a/tools/retrace_benchmark.py b/tools/retrace_benchmark.py
index 42ed792..8c9121a 100755
--- a/tools/retrace_benchmark.py
+++ b/tools/retrace_benchmark.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2020, 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.
diff --git a/tools/run-d8-on-gmscore.py b/tools/run-d8-on-gmscore.py
index 4a64693..c133bce 100755
--- a/tools/run-d8-on-gmscore.py
+++ b/tools/run-d8-on-gmscore.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.
diff --git a/tools/run-jdwp-tests.py b/tools/run-jdwp-tests.py
index f40f2ce..c30cbf2 100755
--- a/tools/run-jdwp-tests.py
+++ b/tools/run-jdwp-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.
diff --git a/tools/run-r8-on-gmscore.py b/tools/run-r8-on-gmscore.py
index ee8b813..280941e 100755
--- a/tools/run-r8-on-gmscore.py
+++ b/tools/run-r8-on-gmscore.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.
diff --git a/tools/run_bootstrap_benchmark.py b/tools/run_bootstrap_benchmark.py
index bc07347..0b35975 100755
--- a/tools/run_bootstrap_benchmark.py
+++ b/tools/run_bootstrap_benchmark.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/run_kotlin_benchmarks.py b/tools/run_kotlin_benchmarks.py
index 166c3e9..ce0f1ad 100755
--- a/tools/run_kotlin_benchmarks.py
+++ b/tools/run_kotlin_benchmarks.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/sanitize_libraries.py b/tools/sanitize_libraries.py
index 8ca54a7..bc61d50 100755
--- a/tools/sanitize_libraries.py
+++ b/tools/sanitize_libraries.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2019, 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.
diff --git a/tools/test.py b/tools/test.py
index 0efa683..ec4bb00 100755
--- a/tools/test.py
+++ b/tools/test.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.
diff --git a/tools/test_android_cts.py b/tools/test_android_cts.py
index fa814bc..f98d724 100755
--- a/tools/test_android_cts.py
+++ b/tools/test_android_cts.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.
diff --git a/tools/test_framework.py b/tools/test_framework.py
index 99e0719..dccb63a 100755
--- a/tools/test_framework.py
+++ b/tools/test_framework.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.
diff --git a/tools/test_gradle_benchmarks.py b/tools/test_gradle_benchmarks.py
index b7c53b8..d9c00e6 100755
--- a/tools/test_gradle_benchmarks.py
+++ b/tools/test_gradle_benchmarks.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2018, 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.
diff --git a/tools/test_helloexample.py b/tools/test_helloexample.py
index f81e64c..509351e 100755
--- a/tools/test_helloexample.py
+++ b/tools/test_helloexample.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2019, 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.
diff --git a/tools/test_r8cfsegments.py b/tools/test_r8cfsegments.py
index 426718a..be8e49c 100755
--- a/tools/test_r8cfsegments.py
+++ b/tools/test_r8cfsegments.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2019, 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.
diff --git a/tools/trigger.py b/tools/trigger.py
index 33b44a7..2b9816a 100755
--- a/tools/trigger.py
+++ b/tools/trigger.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (c) 2019, 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.
diff --git a/tools/update_prebuilds_in_android.py b/tools/update_prebuilds_in_android.py
index 3f30964..6f8da19 100755
--- a/tools/update_prebuilds_in_android.py
+++ b/tools/update_prebuilds_in_android.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.
diff --git a/tools/upload_to_x20.py b/tools/upload_to_x20.py
index 2d08362..3a1ef77 100755
--- a/tools/upload_to_x20.py
+++ b/tools/upload_to_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.
diff --git a/tools/utils_aosp.py b/tools/utils_aosp.py
index 3e2a715..216e43d 100644
--- a/tools/utils_aosp.py
+++ b/tools/utils_aosp.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.