diff --git a/dvc/command/status.py b/dvc/command/status.py
index 7a37c5a63..c67395602 100644
--- a/dvc/command/status.py
+++ b/dvc/command/status.py
@@ -39,7 +39,7 @@ class CmdDataStatus(CmdDataBase):
 
         for key, value in status.items():
             if isinstance(value, str):
-                ui.write("{}{}{}".format(ind, self._normalize(value), key))
+                ui.write(f"{ind}{self._normalize(value)}{key}")
             elif value:
                 ui.write(f"{ind}{key}:")
                 self._show(value, indent + 1)
diff --git a/dvc/dependency/repo.py b/dvc/dependency/repo.py
index 32f51b890..d7f61a4d5 100644
--- a/dvc/dependency/repo.py
+++ b/dvc/dependency/repo.py
@@ -41,7 +41,7 @@ class RepoDependency(Dependency):
         return False
 
     def __str__(self):
-        return "{} ({})".format(self.def_path, self.def_repo[self.PARAM_URL])
+        return f"{self.def_path} ({self.def_repo[self.PARAM_URL]})"
 
     def workspace_status(self):
         current = self.get_obj(locked=True).hash_info
diff --git a/dvc/dvcfile.py b/dvc/dvcfile.py
index 5c4392082..6e769ce90 100644
--- a/dvc/dvcfile.py
+++ b/dvc/dvcfile.py
@@ -200,9 +200,7 @@ class SingleStageFile(FileMixin):
         assert not isinstance(stage, PipelineStage)
         if self.verify:
             check_dvcfile_path(self.repo, self.path)
-        logger.debug(
-            "Saving information to '{file}'.".format(file=relpath(self.path))
-        )
+        logger.debug(f"Saving information to '{relpath(self.path)}'.")
         dump_yaml(self.path, serialize.to_single_stage_file(stage))
         self.repo.scm.track_file(self.relpath)
 
@@ -300,7 +298,7 @@ class PipelineFile(FileMixin):
         if not self.exists():
             return
 
-        with open(self.path, "r", encoding="utf-8") as f:
+        with open(self.path, encoding="utf-8") as f:
             d = parse_yaml_for_update(f.read(), self.path)
 
         self.validate(d, self.path)
diff --git a/dvc/ignore.py b/dvc/ignore.py
index d18e3114a..141a482fa 100644
--- a/dvc/ignore.py
+++ b/dvc/ignore.py
@@ -57,7 +57,7 @@ class DvcIgnorePatterns(DvcIgnore):
         dirname = os.path.normpath(os.path.dirname(path))
         with fs.open(path, encoding="utf-8") as fobj:
             path_spec_lines = [
-                PatternInfo(line, "{}:{}:{}".format(name, line_no + 1, line))
+                PatternInfo(line, f"{name}:{line_no + 1}:{line}")
                 for line_no, line in enumerate(
                     map(str.strip, fobj.readlines())
                 )
@@ -166,7 +166,7 @@ class DvcIgnoreFilter:
             ".hg/",
             ".git/",
             ".git",
-            "{}/".format(Repo.DVC_DIR),
+            f"{Repo.DVC_DIR}/",
         ]
 
         self.fs = fs
diff --git a/dvc/info.py b/dvc/info.py
index 87e7b74e7..ec2420d7f 100644
--- a/dvc/info.py
+++ b/dvc/info.py
@@ -42,9 +42,7 @@ def get_dvc_info():
             # later decides to enable shared cache mode with
             # `dvc config cache.shared group`.
             if os.path.exists(repo.odb.local.cache_dir):
-                info.append(
-                    "Cache types: {}".format(_get_linktype_support_info(repo))
-                )
+                info.append(f"Cache types: {_get_linktype_support_info(repo)}")
                 fs_type = get_fs_type(repo.odb.local.cache_dir)
                 info.append(f"Cache directory: {fs_type}")
             else:
@@ -56,7 +54,7 @@ def get_dvc_info():
             root_directory = repo.root_dir
             fs_root = get_fs_type(os.path.abspath(root_directory))
             info.append(f"Workspace directory: {fs_root}")
-            info.append("Repo: {}".format(_get_dvc_repo_info(repo)))
+            info.append(f"Repo: {_get_dvc_repo_info(repo)}")
     except NotDvcRepoError:
         pass
     except SCMError:
diff --git a/dvc/logger.py b/dvc/logger.py
index 0d5f19273..cd32069ef 100644
--- a/dvc/logger.py
+++ b/dvc/logger.py
@@ -62,7 +62,7 @@ def addLoggingLevel(levelName, levelNum, methodName=None):
 
 class LoggingException(Exception):
     def __init__(self, record):
-        msg = "failed to log {}".format(str(record))
+        msg = f"failed to log {str(record)}"
         super().__init__(msg)
 
 
diff --git a/dvc/objects/db/base.py b/dvc/objects/db/base.py
index 7c2b92657..9bbfea0c6 100644
--- a/dvc/objects/db/base.py
+++ b/dvc/objects/db/base.py
@@ -396,9 +396,7 @@ class ObjectDB:
         """Return list of the specified hashes which exist in this fs.
         Hashes will be queried individually.
         """
-        logger.debug(
-            "Querying {} hashes via object_exists".format(len(hashes))
-        )
+        logger.debug(f"Querying {len(hashes)} hashes via object_exists")
         with Tqdm(
             desc="Querying "
             + ("cache in " + name if name else "remote cache"),
@@ -493,7 +491,7 @@ class ObjectDB:
                 hashes - remote_hashes, jobs, name
             )
 
-        logger.debug("Querying '{}' hashes via traverse".format(len(hashes)))
+        logger.debug(f"Querying '{len(hashes)}' hashes via traverse")
         remote_hashes = set(
             self.list_hashes_traverse(remote_size, remote_hashes, jobs, name)
         )
diff --git a/dvc/objects/db/local.py b/dvc/objects/db/local.py
index 4af4366fc..753924241 100644
--- a/dvc/objects/db/local.py
+++ b/dvc/objects/db/local.py
@@ -112,7 +112,7 @@ class LocalObjectDB(ObjectDB):
             # would get only the part of file. So, at first, the file should be
             # copied with the temporary name, and then original file should be
             # replaced by new.
-            copyfile(path, tmp, name="Unprotecting '{}'".format(relpath(path)))
+            copyfile(path, tmp, name=f"Unprotecting '{relpath(path)}'")
             remove(path)
             os.rename(tmp, path)
 
diff --git a/dvc/path_info.py b/dvc/path_info.py
index 512faa4dd..0ed5437e2 100644
--- a/dvc/path_info.py
+++ b/dvc/path_info.py
@@ -52,7 +52,7 @@ class PathInfo(pathlib.PurePath, _BasePath):
         return relpath(path)
 
     def __repr__(self):
-        return "{}: '{}'".format(type(self).__name__, self)
+        return f"{type(self).__name__}: '{self}'"
 
     # This permits passing it to file utils directly in Python 3.6+
     def __fspath__(self):
@@ -174,7 +174,7 @@ class URLInfo(_BasePath):
         return self.url
 
     def __repr__(self):
-        return "{}: '{}'".format(type(self).__name__, self)
+        return f"{type(self).__name__}: '{self}'"
 
     def __eq__(self, other):
         if isinstance(other, (str, bytes)):
diff --git a/dvc/remote/base.py b/dvc/remote/base.py
index fff64b32e..94b70bead 100644
--- a/dvc/remote/base.py
+++ b/dvc/remote/base.py
@@ -138,7 +138,7 @@ class Remote:
         indexed_hashes = set(self.index.intersection(hashes))
         hashes -= indexed_hashes
         indexed_hashes = list(indexed_hashes)
-        logger.debug("Matched '{}' indexed hashes".format(len(indexed_hashes)))
+        logger.debug(f"Matched '{len(indexed_hashes)}' indexed hashes")
         if not hashes:
             return indexed_hashes
 
diff --git a/dvc/repo/experiments/__init__.py b/dvc/repo/experiments/__init__.py
index 8377403e5..5a560c14c 100644
--- a/dvc/repo/experiments/__init__.py
+++ b/dvc/repo/experiments/__init__.py
@@ -585,7 +585,7 @@ class Experiments:
 
         logger.debug(
             "Reproducing experiment revs '%s'",
-            ", ".join((rev[:7] for rev in to_run)),
+            ", ".join(rev[:7] for rev in to_run),
         )
 
         executors = self._init_executors(to_run)
diff --git a/dvc/repo/plots/template.py b/dvc/repo/plots/template.py
index 17435860b..187e5b7f0 100644
--- a/dvc/repo/plots/template.py
+++ b/dvc/repo/plots/template.py
@@ -84,7 +84,7 @@ class Template:
 
     @classmethod
     def _anchor_str(cls, name):
-        return '"{}"'.format(cls.anchor(name))
+        return f'"{cls.anchor(name)}"'
 
     @classmethod
     def _fill_metadata(cls, content, props):
diff --git a/dvc/rwlock.py b/dvc/rwlock.py
index 4ec2127bf..29d7d90ca 100644
--- a/dvc/rwlock.py
+++ b/dvc/rwlock.py
@@ -28,9 +28,7 @@ class RWLockFileCorruptedError(DvcException):
 
 class RWLockFileFormatError(DvcException):
     def __init__(self, path):
-        super().__init__(
-            "RWLock-file '{}' format error.".format(relpath(path))
-        )
+        super().__init__(f"RWLock-file '{relpath(path)}' format error.")
 
 
 @contextmanager
diff --git a/dvc/scm/git/__init__.py b/dvc/scm/git/__init__.py
index 6136a4e86..8be455a54 100644
--- a/dvc/scm/git/__init__.py
+++ b/dvc/scm/git/__init__.py
@@ -163,7 +163,7 @@ class Git(Base):
         if self.is_ignored(path):
             return
 
-        msg = "Adding '{}' to '{}'.".format(relpath(path), relpath(gitignore))
+        msg = f"Adding '{relpath(path)}' to '{relpath(gitignore)}'."
         logger.debug(msg)
 
         self._add_entry_to_gitignore(entry, gitignore)
diff --git a/dvc/scm/git/stash.py b/dvc/scm/git/stash.py
index af2516810..05213a596 100644
--- a/dvc/scm/git/stash.py
+++ b/dvc/scm/git/stash.py
@@ -46,7 +46,7 @@ class Stash:
 
     def pop(self):
         logger.debug("Popping from stash '%s'", self.ref)
-        ref = "{0}@{{0}}".format(self.ref)
+        ref = f"{self.ref}@{{0}}"
         rev = self.scm.resolve_rev(ref)
         try:
             self.apply(rev)
diff --git a/dvc/stage/run.py b/dvc/stage/run.py
index 972a92877..4b77cdde9 100644
--- a/dvc/stage/run.py
+++ b/dvc/stage/run.py
@@ -116,7 +116,7 @@ def _get_monitor_tasks(stage, checkpoint_func, proc):
 
         result.append(CheckpointTask(stage, checkpoint_func, proc))
 
-    live = first((o for o in stage.outs if (o.live and o.live["html"])))
+    live = first(o for o in stage.outs if (o.live and o.live["html"]))
     if live:
         from .monitor import LiveTask
 
diff --git a/dvc/stage/serialize.py b/dvc/stage/serialize.py
index 19f92319f..bc1c22391 100644
--- a/dvc/stage/serialize.py
+++ b/dvc/stage/serialize.py
@@ -170,10 +170,10 @@ def to_single_stage_lockfile(stage: "Stage") -> dict:
 
     res = OrderedDict([("cmd", stage.cmd)])
     params, deps = split_params_deps(stage)
-    deps, outs = [
+    deps, outs = (
         [_dumpd(item) for item in sort_by_path(items)]
         for items in [deps, stage.outs]
-    ]
+    )
     params = _serialize_params_values(params)
     if deps:
         res[PARAM_DEPS] = deps
diff --git a/dvc/utils/html.py b/dvc/utils/html.py
index b4b56a9a0..3a970174c 100644
--- a/dvc/utils/html.py
+++ b/dvc/utils/html.py
@@ -82,7 +82,7 @@ def write(
 ):
     page_html = None
     if template_path:
-        with open(template_path, "r") as fobj:
+        with open(template_path) as fobj:
             page_html = fobj.read()
 
     document = HTML(page_html)
diff --git a/fastentrypoints.py b/fastentrypoints.py
index fb4a8646e..527f68624 100644
--- a/fastentrypoints.py
+++ b/fastentrypoints.py
@@ -81,8 +81,7 @@ def get_args(cls, dist, header=None):  # noqa: D205,D400
             )
             # pylint: disable=E1101,protected-access
             args = cls._get_script_args(type_, name, header, script_text)
-            for res in args:
-                yield res
+            yield from args
 
 
 # pylint: disable=E1101
diff --git a/setup.py b/setup.py
index e86ea4b09..92db2e522 100644
--- a/setup.py
+++ b/setup.py
@@ -39,7 +39,7 @@ class build_py(_build_py):
         self.mkpath(path)
         with open(os.path.join(path, "version.py"), "w") as fobj:
             fobj.write("# AUTOGENERATED at build time by setup.py\n")
-            fobj.write('__version__ = "{}"\n'.format(version))
+            fobj.write(f'__version__ = "{version}"\n')
 
     def run(self):
         self.execute(self.pin_version, ())
@@ -123,7 +123,7 @@ setup(
     name="dvc",
     version=version,
     description="Git for data scientists - manage your code and data together",
-    long_description=open("README.rst", "r", encoding="UTF-8").read(),
+    long_description=open("README.rst", encoding="UTF-8").read(),
     author="Dmitry Petrov",
     author_email="dmitry@dvc.org",
     download_url="https://github.com/iterative/dvc",
diff --git a/tests/func/experiments/test_remote.py b/tests/func/experiments/test_remote.py
index cd2d338f6..177476853 100644
--- a/tests/func/experiments/test_remote.py
+++ b/tests/func/experiments/test_remote.py
@@ -9,7 +9,7 @@ from dvc.repo.experiments.utils import exp_refs_by_rev
 
 @pytest.fixture
 def git_upstream(tmp_dir, erepo_dir):
-    url = "file://{}".format(erepo_dir.resolve().as_posix())
+    url = f"file://{erepo_dir.resolve().as_posix()}"
     tmp_dir.scm.gitpython.repo.create_remote("upstream", url)
     erepo_dir.remote = "upstream"
     erepo_dir.url = url
@@ -18,7 +18,7 @@ def git_upstream(tmp_dir, erepo_dir):
 
 @pytest.fixture
 def git_downstream(tmp_dir, erepo_dir):
-    url = "file://{}".format(tmp_dir.resolve().as_posix())
+    url = f"file://{tmp_dir.resolve().as_posix()}"
     erepo_dir.scm.gitpython.repo.create_remote("upstream", url)
     erepo_dir.remote = "upstream"
     erepo_dir.url = url
diff --git a/tests/func/test_add.py b/tests/func/test_add.py
index 0b6164563..f8d15d7ce 100644
--- a/tests/func/test_add.py
+++ b/tests/func/test_add.py
@@ -5,10 +5,10 @@ import shutil
 import stat
 import textwrap
 import time
+from unittest.mock import call, patch
 
 import colorama
 import pytest
-from mock import call, patch
 
 import dvc as dvc_module
 from dvc.dvcfile import DVC_FILE_SUFFIX
diff --git a/tests/func/test_analytics.py b/tests/func/test_analytics.py
index f0e9c71f4..8c3cfa98b 100644
--- a/tests/func/test_analytics.py
+++ b/tests/func/test_analytics.py
@@ -1,6 +1,5 @@
 import os
-
-import mock
+from unittest import mock
 
 from dvc.analytics import _scm_in_use
 from dvc.main import main
diff --git a/tests/func/test_check_ignore.py b/tests/func/test_check_ignore.py
index b1e2d674c..d7dc1810f 100644
--- a/tests/func/test_check_ignore.py
+++ b/tests/func/test_check_ignore.py
@@ -22,8 +22,8 @@ def test_check_ignore(tmp_dir, dvc, file, ret, output, caplog, capsys):
 @pytest.mark.parametrize(
     "file,ret,output",
     [
-        ("file", 0, "{}:1:f*\tfile\n".format(DvcIgnore.DVCIGNORE_FILE)),
-        ("foo", 0, "{}:2:!foo\tfoo\n".format(DvcIgnore.DVCIGNORE_FILE)),
+        ("file", 0, f"{DvcIgnore.DVCIGNORE_FILE}:1:f*\tfile\n"),
+        ("foo", 0, f"{DvcIgnore.DVCIGNORE_FILE}:2:!foo\tfoo\n"),
         (
             os.path.join("dir", "foobar"),
             0,
@@ -129,8 +129,8 @@ def test_check_ignore_details_all(tmp_dir, dvc, capsys):
 
     assert main(["check-ignore", "-d", "-a", "foo"]) == 0
     out, _ = capsys.readouterr()
-    assert "{}:1:f*\tfoo\n".format(DvcIgnore.DVCIGNORE_FILE) in out
-    assert "{}:2:!foo\tfoo\n".format(DvcIgnore.DVCIGNORE_FILE) in out
+    assert f"{DvcIgnore.DVCIGNORE_FILE}:1:f*\tfoo\n" in out
+    assert f"{DvcIgnore.DVCIGNORE_FILE}:2:!foo\tfoo\n" in out
 
 
 @pytest.mark.parametrize(
diff --git a/tests/func/test_checkout.py b/tests/func/test_checkout.py
index 3501d43ea..d1702b3e3 100644
--- a/tests/func/test_checkout.py
+++ b/tests/func/test_checkout.py
@@ -5,9 +5,9 @@ import os
 import shutil
 import stat
 import textwrap
+from unittest.mock import patch
 
 import pytest
-from mock import patch
 
 from dvc.dvcfile import DVC_FILE_SUFFIX, PIPELINE_FILE, Dvcfile
 from dvc.exceptions import (
diff --git a/tests/func/test_external_repo.py b/tests/func/test_external_repo.py
index ab7189c09..73f359268 100644
--- a/tests/func/test_external_repo.py
+++ b/tests/func/test_external_repo.py
@@ -1,6 +1,5 @@
 import os
-
-from mock import ANY, patch
+from unittest.mock import ANY, patch
 
 from dvc.external_repo import CLONES, external_repo
 from dvc.fs.local import LocalFileSystem
diff --git a/tests/func/test_get.py b/tests/func/test_get.py
index 892408327..36a1d6dc1 100644
--- a/tests/func/test_get.py
+++ b/tests/func/test_get.py
@@ -266,7 +266,7 @@ def test_get_pipeline_tracked_outs(
     dvc.scm.commit("add pipeline stage")
 
     with git_dir.chdir():
-        Repo.get("file:///{}".format(os.fspath(tmp_dir)), "bar", out="baz")
+        Repo.get(f"file:///{os.fspath(tmp_dir)}", "bar", out="baz")
         assert (git_dir / "baz").read_text() == "foo"
 
 
diff --git a/tests/func/test_ignore.py b/tests/func/test_ignore.py
index c0f8d8e75..10bd0d312 100644
--- a/tests/func/test_ignore.py
+++ b/tests/func/test_ignore.py
@@ -21,7 +21,7 @@ def _to_pattern_info_list(str_list: List):
 @pytest.mark.parametrize("filename", ["ignored", "тест"])
 def test_ignore(tmp_dir, dvc, filename):
     tmp_dir.gen({"dir": {filename: filename, "other": "text2"}})
-    tmp_dir.gen(DvcIgnore.DVCIGNORE_FILE, "dir/{}".format(filename))
+    tmp_dir.gen(DvcIgnore.DVCIGNORE_FILE, f"dir/{filename}")
 
     dvc._reset()
 
@@ -342,17 +342,17 @@ def test_pattern_trie_fs(tmp_dir, dvc):
     first_pattern = merge_patterns(
         *base_pattern,
         _to_pattern_info_list(["a", "b", "c"]),
-        os.fspath(tmp_dir / "top" / "first")
+        os.fspath(tmp_dir / "top" / "first"),
     )
     second_pattern = merge_patterns(
         *first_pattern,
         _to_pattern_info_list(["d", "e", "f"]),
-        os.fspath(tmp_dir / "top" / "first" / "middle" / "second")
+        os.fspath(tmp_dir / "top" / "first" / "middle" / "second"),
     )
     other_pattern = merge_patterns(
         *base_pattern,
         _to_pattern_info_list(["1", "2", "3"]),
-        os.fspath(tmp_dir / "other")
+        os.fspath(tmp_dir / "other"),
     )
 
     assert DvcIgnorePatterns(*base_pattern) == ignore_pattern_top
diff --git a/tests/func/test_import.py b/tests/func/test_import.py
index 372af19ac..c8c765510 100644
--- a/tests/func/test_import.py
+++ b/tests/func/test_import.py
@@ -1,9 +1,9 @@
 import filecmp
 import os
+from unittest.mock import patch
 
 import pytest
 from funcy import first
-from mock import patch
 
 import dvc.data_cloud as cloud
 from dvc.config import NoRemoteError
@@ -407,9 +407,7 @@ def test_import_pipeline_tracked_outs(
     dvc.scm.commit("add pipeline stage")
 
     with erepo_dir.chdir():
-        erepo_dir.dvc.imp(
-            "file:///{}".format(os.fspath(tmp_dir)), "bar", out="baz"
-        )
+        erepo_dir.dvc.imp(f"file:///{os.fspath(tmp_dir)}", "bar", out="baz")
         assert (erepo_dir / "baz").read_text() == "foo"
 
 
diff --git a/tests/func/test_remote.py b/tests/func/test_remote.py
index 2e9fc083e..10dce018d 100644
--- a/tests/func/test_remote.py
+++ b/tests/func/test_remote.py
@@ -1,10 +1,10 @@
 import errno
 import os
 import stat
+from unittest.mock import patch
 
 import configobj
 import pytest
-from mock import patch
 
 from dvc.config import Config
 from dvc.exceptions import DownloadError, RemoteCacheRequiredError, UploadError
diff --git a/tests/func/test_repro.py b/tests/func/test_repro.py
index 73dd2f35c..948505a92 100644
--- a/tests/func/test_repro.py
+++ b/tests/func/test_repro.py
@@ -3,9 +3,9 @@ import os
 import re
 import shutil
 from pathlib import Path
+from unittest.mock import patch
 
 import pytest
-from mock import patch
 
 from dvc.dvcfile import DVC_FILE, Dvcfile
 from dvc.exceptions import (
diff --git a/tests/func/test_run_single_stage.py b/tests/func/test_run_single_stage.py
index a13fd825f..146d0a020 100644
--- a/tests/func/test_run_single_stage.py
+++ b/tests/func/test_run_single_stage.py
@@ -4,8 +4,8 @@ import os
 import textwrap
 import uuid
 from pathlib import Path
+from unittest import mock
 
-import mock
 import pytest
 
 from dvc.dependency.base import DependencyIsStageFileError
diff --git a/tests/func/test_status.py b/tests/func/test_status.py
index 655c179c6..c2902dedf 100644
--- a/tests/func/test_status.py
+++ b/tests/func/test_status.py
@@ -67,9 +67,7 @@ def test_status_before_and_after_dvc_init(tmp_dir, dvc, git_dir):
 
     (status,) = dvc.status(["file.dvc"])["file.dvc"]
     assert status == {
-        "changed deps": {
-            "file ({})".format(os.fspath(git_dir)): "update available"
-        }
+        "changed deps": {f"file ({os.fspath(git_dir)})": "update available"}
     }
 
 
diff --git a/tests/func/test_update.py b/tests/func/test_update.py
index 0055f3cf9..29a1c6011 100644
--- a/tests/func/test_update.py
+++ b/tests/func/test_update.py
@@ -144,7 +144,7 @@ def test_update_before_and_after_dvc_init(tmp_dir, dvc, git_dir):
         "file.dvc": [
             {
                 "changed deps": {
-                    "file ({})".format(os.fspath(git_dir)): "update available"
+                    f"file ({os.fspath(git_dir)})": "update available"
                 }
             }
         ]
diff --git a/tests/unit/command/test_diff.py b/tests/unit/command/test_diff.py
index 70877c33d..2251291f6 100644
--- a/tests/unit/command/test_diff.py
+++ b/tests/unit/command/test_diff.py
@@ -1,7 +1,7 @@
 import collections
 import os
+from unittest import mock
 
-import mock
 import pytest
 
 from dvc.cli import parse_args
diff --git a/tests/unit/output/test_local.py b/tests/unit/output/test_local.py
index 39f551e40..a071eaf01 100644
--- a/tests/unit/output/test_local.py
+++ b/tests/unit/output/test_local.py
@@ -1,6 +1,5 @@
 import os
-
-from mock import patch
+from unittest.mock import patch
 
 from dvc.hash_info import HashInfo
 from dvc.output import Output
diff --git a/tests/unit/remote/ssh/test_ssh.py b/tests/unit/remote/ssh/test_ssh.py
index bd2570187..72e9d5692 100644
--- a/tests/unit/remote/ssh/test_ssh.py
+++ b/tests/unit/remote/ssh/test_ssh.py
@@ -1,9 +1,9 @@
 import getpass
 import os
 import sys
+from unittest.mock import mock_open, patch
 
 import pytest
-from mock import mock_open, patch
 
 from dvc.fs.ssh import SSHFileSystem
 from dvc.system import System
diff --git a/tests/unit/remote/test_base.py b/tests/unit/remote/test_base.py
index 3a9a44c84..2781bb247 100644
--- a/tests/unit/remote/test_base.py
+++ b/tests/unit/remote/test_base.py
@@ -1,6 +1,6 @@
 import math
+from unittest import mock
 
-import mock
 import pytest
 
 from dvc.fs.base import BaseFileSystem, RemoteCmdError
diff --git a/tests/unit/remote/test_slow_link_detection.py b/tests/unit/remote/test_slow_link_detection.py
index 49343a882..979b5b936 100644
--- a/tests/unit/remote/test_slow_link_detection.py
+++ b/tests/unit/remote/test_slow_link_detection.py
@@ -1,4 +1,5 @@
-import mock
+from unittest import mock
+
 import pytest
 
 import dvc.remote.slow_link_detection
diff --git a/tests/unit/repo/test_reproduce.py b/tests/unit/repo/test_reproduce.py
index 488eeffbe..af2d49187 100644
--- a/tests/unit/repo/test_reproduce.py
+++ b/tests/unit/repo/test_reproduce.py
@@ -1,4 +1,4 @@
-import mock
+from unittest import mock
 
 
 @mock.patch("dvc.repo.reproduce._reproduce_stage", returns=[])
diff --git a/tests/unit/scm/test_git.py b/tests/unit/scm/test_git.py
index 1c3b09daa..b3662fed6 100644
--- a/tests/unit/scm/test_git.py
+++ b/tests/unit/scm/test_git.py
@@ -238,7 +238,7 @@ def test_push_refspec(tmp_dir, scm, make_tmp_dir, use_url):
         }
     )
     remote_dir = make_tmp_dir("git-remote", scm=True)
-    url = "file://{}".format(remote_dir.resolve().as_posix())
+    url = f"file://{remote_dir.resolve().as_posix()}"
     scm.gitpython.repo.create_remote("origin", url)
 
     with pytest.raises(SCMError):
@@ -261,7 +261,7 @@ def test_push_refspec(tmp_dir, scm, make_tmp_dir, use_url):
 
 def test_fetch_refspecs(tmp_dir, scm, make_tmp_dir):
     remote_dir = make_tmp_dir("git-remote", scm=True)
-    url = "file://{}".format(remote_dir.resolve().as_posix())
+    url = f"file://{remote_dir.resolve().as_posix()}"
 
     remote_dir.scm_gen({"file": "0"}, commit="init")
     init_rev = remote_dir.scm.get_rev()
@@ -428,7 +428,7 @@ def test_resolve_rev(tmp_dir, scm, make_tmp_dir, git):
         pytest.skip()
 
     remote_dir = make_tmp_dir("git-remote", scm=True)
-    url = "file://{}".format(remote_dir.resolve().as_posix())
+    url = f"file://{remote_dir.resolve().as_posix()}"
     scm.gitpython.repo.create_remote("origin", url)
     scm.gitpython.repo.create_remote("upstream", url)
 
diff --git a/tests/unit/stage/test_stage.py b/tests/unit/stage/test_stage.py
index 0ad380ff6..bf251af2f 100644
--- a/tests/unit/stage/test_stage.py
+++ b/tests/unit/stage/test_stage.py
@@ -2,8 +2,8 @@ import os
 import signal
 import subprocess
 import threading
+from unittest import mock
 
-import mock
 import pytest
 
 from dvc.dependency.repo import RepoDependency
diff --git a/tests/unit/test_daemon.py b/tests/unit/test_daemon.py
index d45fe96eb..d56797203 100644
--- a/tests/unit/test_daemon.py
+++ b/tests/unit/test_daemon.py
@@ -1,8 +1,6 @@
 import inspect
 import os
-from unittest import TestCase
-
-import mock
+from unittest import TestCase, mock
 
 from dvc import daemon
 
diff --git a/tests/unit/test_ignore.py b/tests/unit/test_ignore.py
index 8ec2cb453..5a114c78e 100644
--- a/tests/unit/test_ignore.py
+++ b/tests/unit/test_ignore.py
@@ -1,7 +1,7 @@
 import os
+from unittest.mock import MagicMock, mock_open, patch
 
 import pytest
-from mock import MagicMock, mock_open, patch
 
 from dvc.ignore import DvcIgnorePatterns
 
diff --git a/tests/unit/test_metrics.py b/tests/unit/test_metrics.py
index c5a6a3783..1ab9b4504 100644
--- a/tests/unit/test_metrics.py
+++ b/tests/unit/test_metrics.py
@@ -21,7 +21,7 @@ def test_metrics_order(tmp_dir, dvc):
     )
     with (tmp_dir / "sub").chdir():
         dvc.stage.add(
-            metrics=[str(tmp_dir / "p1.json"), str("p3.json")],
+            metrics=[str(tmp_dir / "p1.json"), "p3.json"],
             cmd="cmd2",
             name="stage2",
         )
diff --git a/tests/unit/test_progress.py b/tests/unit/test_progress.py
index 30dd7e662..f8fd13fa3 100644
--- a/tests/unit/test_progress.py
+++ b/tests/unit/test_progress.py
@@ -1,7 +1,6 @@
 import logging
 import sys
-
-import mock
+from unittest import mock
 
 from dvc.progress import Tqdm
 from dvc.utils import env2bool
diff --git a/tests/unit/test_prompt.py b/tests/unit/test_prompt.py
index 68ccb8877..1a29a08d7 100644
--- a/tests/unit/test_prompt.py
+++ b/tests/unit/test_prompt.py
@@ -1,6 +1,4 @@
-from unittest import TestCase
-
-import mock
+from unittest import TestCase, mock
 
 from dvc.prompt import confirm
 
diff --git a/tests/unit/test_updater.py b/tests/unit/test_updater.py
index c066c239a..854f408a4 100644
--- a/tests/unit/test_updater.py
+++ b/tests/unit/test_updater.py
@@ -2,8 +2,8 @@ import json
 import logging
 import os
 import time
+from unittest import mock
 
-import mock
 import pytest
 
 from dvc import __version__
diff --git a/tests/unit/test_version.py b/tests/unit/test_version.py
index 5cd4f8ca5..f41eca099 100644
--- a/tests/unit/test_version.py
+++ b/tests/unit/test_version.py
@@ -1,6 +1,5 @@
 import subprocess
-
-import mock
+from unittest import mock
 
 import dvc.version
 
diff --git a/tests/unit/utils/test_fs.py b/tests/unit/utils/test_fs.py
index 3a15e7a30..23eb644d5 100644
--- a/tests/unit/utils/test_fs.py
+++ b/tests/unit/utils/test_fs.py
@@ -1,9 +1,9 @@
 import filecmp
 import os
 from unittest import TestCase
+from unittest.mock import patch
 
 import pytest
-from mock import patch
 
 import dvc
 from dvc.fs.local import LocalFileSystem