diff --git a/DEPS b/DEPS
index 93b628f..9393a0b 100644
--- a/DEPS
+++ b/DEPS
@@ -352,7 +352,7 @@
     # disabled.
     'name': 'disable_depot_tools_selfupdate',
     'pattern': '.',
-    'action': [ 'python',
+    'action': [ 'python3',
                 'third_party/depot_tools/update_depot_tools_toggle.py',
                 '--disable',
     ],
@@ -362,7 +362,7 @@
     'name': 'ciopfs_linux',
     'pattern': '.',
     'condition': 'checkout_win and host_os == "linux"',
-    'action': [ 'python',
+    'action': [ 'python3',
                 'third_party/depot_tools/download_from_google_storage.py',
                 '--no_resume',
                 '--no_auth',
@@ -375,21 +375,21 @@
     'name': 'win_toolchain',
     'pattern': '.',
     'condition': 'checkout_win',
-    'action': ['python', 'build/vs_toolchain.py', 'update', '--force'],
+    'action': ['python3', 'build/vs_toolchain.py', 'update', '--force'],
   },
   {
     # Update the Mac toolchain if necessary.
     'name': 'mac_toolchain',
     'pattern': '.',
     'condition': 'checkout_mac',
-    'action': ['python', 'build/mac_toolchain.py'],
+    'action': ['python3', 'build/mac_toolchain.py'],
   },
   # Pull clang-format binaries using checked-in hashes.
   {
     'name': 'clang_format_win',
     'pattern': '.',
     'condition': 'host_os == "win"',
-    'action': [ 'python',
+    'action': [ 'python3',
                 'third_party/depot_tools/download_from_google_storage.py',
                 '--no_resume',
                 '--no_auth',
@@ -401,7 +401,7 @@
     'name': 'clang_format_mac',
     'pattern': '.',
     'condition': 'host_os == "mac"',
-    'action': [ 'python',
+    'action': [ 'python3',
                 'third_party/depot_tools/download_from_google_storage.py',
                 '--no_resume',
                 '--no_auth',
@@ -413,7 +413,7 @@
     'name': 'clang_format_linux',
     'pattern': '.',
     'condition': 'host_os == "linux"',
-    'action': [ 'python',
+    'action': [ 'python3',
                 'third_party/depot_tools/download_from_google_storage.py',
                 '--no_resume',
                 '--no_auth',
@@ -425,7 +425,7 @@
     # Note: On Win, this should run after win_toolchain, as it may use it.
     'name': 'clang',
     'pattern': '.',
-    'action': ['python',
+    'action': ['python3',
                'tools/clang/scripts/update.py'
     ],
   },
@@ -433,42 +433,42 @@
     'name': 'sysroot_arm',
     'pattern': '.',
     'condition': 'checkout_linux and checkout_arm',
-    'action': ['python', 'build/linux/sysroot_scripts/install-sysroot.py',
+    'action': ['python3', 'build/linux/sysroot_scripts/install-sysroot.py',
                '--arch=arm'],
   },
   {
     'name': 'sysroot_arm64',
     'pattern': '.',
     'condition': 'checkout_linux and checkout_arm64',
-    'action': ['python', 'build/linux/sysroot_scripts/install-sysroot.py',
+    'action': ['python3', 'build/linux/sysroot_scripts/install-sysroot.py',
                '--arch=arm64'],
   },
   {
     'name': 'sysroot_x86',
     'pattern': '.',
     'condition': 'checkout_linux and (checkout_x86 or checkout_x64)',
-    'action': ['python', 'build/linux/sysroot_scripts/install-sysroot.py',
+    'action': ['python3', 'build/linux/sysroot_scripts/install-sysroot.py',
                '--arch=x86'],
   },
   {
     'name': 'sysroot_mips',
     'pattern': '.',
     'condition': 'checkout_linux and checkout_mips',
-    'action': ['python', 'build/linux/sysroot_scripts/install-sysroot.py',
+    'action': ['python3', 'build/linux/sysroot_scripts/install-sysroot.py',
                '--arch=mips'],
   },
   {
     'name': 'sysroot_x64',
     'pattern': '.',
     'condition': 'checkout_linux and checkout_x64',
-    'action': ['python', 'build/linux/sysroot_scripts/install-sysroot.py',
+    'action': ['python3', 'build/linux/sysroot_scripts/install-sysroot.py',
                '--arch=x64'],
   },
   {
     'name': 'msan_chained_origins',
     'pattern': '.',
     'condition': 'checkout_instrumented_libraries',
-    'action': [ 'python',
+    'action': [ 'python3',
                 'third_party/depot_tools/download_from_google_storage.py',
                 '--no_resume',
                 '--no_auth',
@@ -480,7 +480,7 @@
     'name': 'msan_no_origins',
     'pattern': '.',
     'condition': 'checkout_instrumented_libraries',
-    'action': [ 'python',
+    'action': [ 'python3',
                 'third_party/depot_tools/download_from_google_storage.py',
                 '--no_resume',
                 '--no_auth',
@@ -492,7 +492,7 @@
     # Update LASTCHANGE.
     'name': 'lastchange',
     'pattern': '.',
-    'action': ['python', 'build/util/lastchange.py',
+    'action': ['python3', 'build/util/lastchange.py',
                '-o', 'build/util/LASTCHANGE'],
   },
 ]