diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index c7f17e415d9..c49a42ede75 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -9,7 +9,8 @@ for more details about the presubmit API built into gcl.
 """
 
 import datetime
-import imp
+import importlib.util
+import importlib.machinery
 import os
 import os.path
 from typing import Callable
@@ -70,10 +71,22 @@ def _CheckFormat(input_api,
     return unformatted_files
 
 
+def load_source(modname, filename):
+    loader = importlib.machinery.SourceFileLoader(modname, filename)
+    spec = importlib.util.spec_from_file_location(modname,
+                                                  filename,
+                                                  loader=loader)
+    module = importlib.util.module_from_spec(spec)
+    # The module is always executed and not cached in sys.modules.
+    # Uncomment the following line to cache the module.
+    # sys.modules[module.__name__] = module
+    loader.exec_module(module)
+    return module
+
+
 def _CheckDartFormat(input_api, output_api):
     local_root = input_api.change.RepositoryRoot()
-    utils = imp.load_source('utils',
-                            os.path.join(local_root, 'tools', 'utils.py'))
+    utils = load_source('utils', os.path.join(local_root, 'tools', 'utils.py'))
 
     dart = os.path.join(utils.CheckedInSdkPath(), 'bin', 'dart')
 
@@ -155,8 +168,7 @@ def _CheckDartFormat(input_api, output_api):
 
 def _CheckStatusFiles(input_api, output_api):
     local_root = input_api.change.RepositoryRoot()
-    utils = imp.load_source('utils',
-                            os.path.join(local_root, 'tools', 'utils.py'))
+    utils = load_source('utils', os.path.join(local_root, 'tools', 'utils.py'))
 
     dart = os.path.join(utils.CheckedInSdkPath(), 'bin', 'dart')
     lint = os.path.join(local_root, 'pkg', 'status_file', 'bin', 'lint.dart')
@@ -231,12 +243,12 @@ def _CheckLayering(input_api, output_api):
         return []
 
     local_root = input_api.change.RepositoryRoot()
-    compiler_layering_check = imp.load_source(
+    compiler_layering_check = load_source(
         'compiler_layering_check',
         os.path.join(local_root, 'runtime', 'tools',
                      'compiler_layering_check.py'))
     errors = compiler_layering_check.DoCheck(local_root)
-    embedder_layering_check = imp.load_source(
+    embedder_layering_check = load_source(
         'embedder_layering_check',
         os.path.join(local_root, 'runtime', 'tools',
                      'embedder_layering_check.py'))
diff --git a/pkg/_fe_analyzer_shared/PRESUBMIT.py b/pkg/_fe_analyzer_shared/PRESUBMIT.py
index 70592807da5..a5bcbc5ee2f 100644
--- a/pkg/_fe_analyzer_shared/PRESUBMIT.py
+++ b/pkg/_fe_analyzer_shared/PRESUBMIT.py
@@ -8,13 +8,27 @@ See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into gcl.
 """
 
-import imp
+import importlib.util
+import importlib.machinery
 import os.path
 import subprocess
 
 USE_PYTHON3 = True
 
 
+def load_source(modname, filename):
+    loader = importlib.machinery.SourceFileLoader(modname, filename)
+    spec = importlib.util.spec_from_file_location(modname,
+                                                  filename,
+                                                  loader=loader)
+    module = importlib.util.module_from_spec(spec)
+    # The module is always executed and not cached in sys.modules.
+    # Uncomment the following line to cache the module.
+    # sys.modules[module.__name__] = module
+    loader.exec_module(module)
+    return module
+
+
 def runSmokeTest(input_api, output_api):
     hasChangedFiles = False
     for git_file in input_api.AffectedTextFiles():
@@ -25,8 +39,8 @@ def runSmokeTest(input_api, output_api):
 
     if hasChangedFiles:
         local_root = input_api.change.RepositoryRoot()
-        utils = imp.load_source('utils',
-                                os.path.join(local_root, 'tools', 'utils.py'))
+        utils = load_source('utils',
+                            os.path.join(local_root, 'tools', 'utils.py'))
         dart = os.path.join(utils.CheckedInSdkPath(), 'bin', 'dart')
         smoke_test = os.path.join(local_root, 'pkg', '_fe_analyzer_shared',
                                   'tool', 'smoke_test_quick.dart')
diff --git a/pkg/front_end/PRESUBMIT.py b/pkg/front_end/PRESUBMIT.py
index 0a0490477b1..5dae483e128 100644
--- a/pkg/front_end/PRESUBMIT.py
+++ b/pkg/front_end/PRESUBMIT.py
@@ -8,13 +8,27 @@ See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into gcl.
 """
 
-import imp
+import importlib.util
+import importlib.machinery
 import os.path
 import subprocess
 
 USE_PYTHON3 = True
 
 
+def load_source(modname, filename):
+    loader = importlib.machinery.SourceFileLoader(modname, filename)
+    spec = importlib.util.spec_from_file_location(modname,
+                                                  filename,
+                                                  loader=loader)
+    module = importlib.util.module_from_spec(spec)
+    # The module is always executed and not cached in sys.modules.
+    # Uncomment the following line to cache the module.
+    # sys.modules[module.__name__] = module
+    loader.exec_module(module)
+    return module
+
+
 def runSmokeTest(input_api, output_api):
     hasChangedFiles = False
     for git_file in input_api.AffectedTextFiles():
@@ -25,8 +39,8 @@ def runSmokeTest(input_api, output_api):
 
     if hasChangedFiles:
         local_root = input_api.change.RepositoryRoot()
-        utils = imp.load_source('utils',
-                        os.path.join(local_root, 'tools', 'utils.py'))
+        utils = load_source('utils',
+                            os.path.join(local_root, 'tools', 'utils.py'))
         dart = os.path.join(utils.CheckedInSdkPath(), 'bin', 'dart')
         smoke_test = os.path.join(local_root, 'pkg', 'front_end', 'tool',
                                   'smoke_test_quick.dart')
diff --git a/pkg/kernel/PRESUBMIT.py b/pkg/kernel/PRESUBMIT.py
index 8630f2084e5..381237b37e4 100644
--- a/pkg/kernel/PRESUBMIT.py
+++ b/pkg/kernel/PRESUBMIT.py
@@ -8,13 +8,27 @@ See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into gcl.
 """
 
-import imp
+import importlib.util
+import importlib.machinery
 import os.path
 import subprocess
 
 USE_PYTHON3 = True
 
 
+def load_source(modname, filename):
+    loader = importlib.machinery.SourceFileLoader(modname, filename)
+    spec = importlib.util.spec_from_file_location(modname,
+                                                  filename,
+                                                  loader=loader)
+    module = importlib.util.module_from_spec(spec)
+    # The module is always executed and not cached in sys.modules.
+    # Uncomment the following line to cache the module.
+    # sys.modules[module.__name__] = module
+    loader.exec_module(module)
+    return module
+
+
 def runSmokeTest(input_api, output_api):
     hasChangedFiles = False
     for git_file in input_api.AffectedTextFiles():
@@ -25,8 +39,8 @@ def runSmokeTest(input_api, output_api):
 
     if hasChangedFiles:
         local_root = input_api.change.RepositoryRoot()
-        utils = imp.load_source('utils',
-                        os.path.join(local_root, 'tools', 'utils.py'))
+        utils = load_source('utils',
+                            os.path.join(local_root, 'tools', 'utils.py'))
         dart = os.path.join(utils.CheckedInSdkPath(), 'bin', 'dart')
         smoke_test = os.path.join(local_root, 'pkg', 'kernel', 'tool',
                                   'smoke_test_quick.dart')
diff --git a/sdk/lib/PRESUBMIT.py b/sdk/lib/PRESUBMIT.py
index 21b779b5991..691fd78fb12 100644
--- a/sdk/lib/PRESUBMIT.py
+++ b/sdk/lib/PRESUBMIT.py
@@ -8,13 +8,27 @@ See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into gcl.
 """
 
-import imp
+import importlib.util
+import importlib.machinery
 import os.path
 import subprocess
 
 USE_PYTHON3 = True
 
 
+def load_source(modname, filename):
+    loader = importlib.machinery.SourceFileLoader(modname, filename)
+    spec = importlib.util.spec_from_file_location(modname,
+                                                  filename,
+                                                  loader=loader)
+    module = importlib.util.module_from_spec(spec)
+    # The module is always executed and not cached in sys.modules.
+    # Uncomment the following line to cache the module.
+    # sys.modules[module.__name__] = module
+    loader.exec_module(module)
+    return module
+
+
 def runSmokeTest(input_api, output_api):
     hasChangedFiles = False
     for git_file in input_api.AffectedTextFiles():
@@ -26,8 +40,8 @@ def runSmokeTest(input_api, output_api):
 
     if hasChangedFiles:
         local_root = input_api.change.RepositoryRoot()
-        utils = imp.load_source('utils',
-                                os.path.join(local_root, 'tools', 'utils.py'))
+        utils = load_source('utils',
+                            os.path.join(local_root, 'tools', 'utils.py'))
         dart = os.path.join(utils.CheckedInSdkPath(), 'bin', 'dart')
         yaml2json = os.path.join(local_root, 'tools', 'yaml2json.dart')
         libYaml = os.path.join(local_root, 'sdk', 'lib', 'libraries.yaml')
diff --git a/tools/bots/bot_utils.py b/tools/bots/bot_utils.py
index ff92e00fd3b..819e9c532c7 100755
--- a/tools/bots/bot_utils.py
+++ b/tools/bots/bot_utils.py
@@ -5,7 +5,8 @@
 # BSD-style license that can be found in the LICENSE file.
 
 import hashlib
-import imp
+import importlib.util
+import importlib.machinery
 import os
 import subprocess
 import sys
@@ -14,9 +15,22 @@ DART_DIR = os.path.abspath(
     os.path.normpath(os.path.join(__file__, '..', '..', '..')))
 
 
+def load_source(modname, filename):
+    loader = importlib.machinery.SourceFileLoader(modname, filename)
+    spec = importlib.util.spec_from_file_location(modname,
+                                                  filename,
+                                                  loader=loader)
+    module = importlib.util.module_from_spec(spec)
+    # The module is always executed and not cached in sys.modules.
+    # Uncomment the following line to cache the module.
+    # sys.modules[module.__name__] = module
+    loader.exec_module(module)
+    return module
+
+
 def GetUtils():
     '''Dynamically load the tools/utils.py python module.'''
-    return imp.load_source('utils', os.path.join(DART_DIR, 'tools', 'utils.py'))
+    return load_source('utils', os.path.join(DART_DIR, 'tools', 'utils.py'))
 
 
 def run(command, env=None, shell=False, throw_on_error=True):
diff --git a/tools/utils.py b/tools/utils.py
index e9bb2f92635..13b584389c4 100644
--- a/tools/utils.py
+++ b/tools/utils.py
@@ -11,7 +11,8 @@ import contextlib
 import datetime
 from functools import total_ordering
 import glob
-import imp
+import importlib.util
+import importlib.machinery
 import json
 import os
 import platform
@@ -111,16 +112,29 @@ def GetBaseDir():
     return BASE_DIR
 
 
+def load_source(modname, filename):
+    loader = importlib.machinery.SourceFileLoader(modname, filename)
+    spec = importlib.util.spec_from_file_location(modname,
+                                                  filename,
+                                                  loader=loader)
+    module = importlib.util.module_from_spec(spec)
+    # The module is always executed and not cached in sys.modules.
+    # Uncomment the following line to cache the module.
+    # sys.modules[module.__name__] = module
+    loader.exec_module(module)
+    return module
+
+
 def GetBotUtils(repo_path=DART_DIR):
     '''Dynamically load the tools/bots/bot_utils.py python module.'''
-    return imp.load_source(
-        'bot_utils', os.path.join(repo_path, 'tools', 'bots', 'bot_utils.py'))
+    return load_source('bot_utils',
+                       os.path.join(repo_path, 'tools', 'bots', 'bot_utils.py'))
 
 
 def GetMinidumpUtils(repo_path=DART_DIR):
     '''Dynamically load the tools/minidump.py python module.'''
-    return imp.load_source('minidump',
-                           os.path.join(repo_path, 'tools', 'minidump.py'))
+    return load_source('minidump',
+                       os.path.join(repo_path, 'tools', 'minidump.py'))
 
 
 @total_ordering