diff --git a/.ci/Jenkinsfile b/.ci/Jenkinsfile
index d10eeaa..166c030 100644
--- a/.ci/Jenkinsfile
+++ b/.ci/Jenkinsfile
@@ -55,7 +55,7 @@ pipeline {
         axes {
           axis {
             name 'VERSION'
-            values '2.7', '3.6', '3.7', '3.8'
+            values '3.6', '3.7', '3.8', '3.9', '3.10'
           }
         }
         stages {
@@ -88,7 +88,7 @@ pipeline {
 }
 
 def python(Map v = [:], body) {
-  def dockerImage = v.version.equals('2.7') ? 'python:3.7' : "python:${v.version}"
+  def dockerImage = "python:${v.version}"
   // If dockerhub got issues then let's retry twice
   retry(2) {
     sleep 5
diff --git a/ecs_logging/_stdlib.py b/ecs_logging/_stdlib.py
index 5905e86..c1254af 100644
--- a/ecs_logging/_stdlib.py
+++ b/ecs_logging/_stdlib.py
@@ -111,14 +111,9 @@ def __init__(
         if validate is not None:
             # validate was introduced in py3.8 so we need to only provide it if the user provided it
             _kwargs["validate"] = validate
-        if sys.version_info < (3, 0):  # Different args in py2.7
-            super(StdlibFormatter, self).__init__(  # type: ignore[call-arg]
-                fmt=fmt, datefmt=datefmt
-            )
-        else:
-            super(StdlibFormatter, self).__init__(  # type: ignore[call-arg]
-                fmt=fmt, datefmt=datefmt, style=style, **_kwargs
-            )
+        super().__init__(  # type: ignore[call-arg]
+            fmt=fmt, datefmt=datefmt, style=style, **_kwargs
+        )
 
         if stack_trace_limit is not None:
             if not isinstance(stack_trace_limit, int):
diff --git a/ecs_logging/_utils.py b/ecs_logging/_utils.py
index 244986f..be55e87 100644
--- a/ecs_logging/_utils.py
+++ b/ecs_logging/_utils.py
@@ -62,17 +62,15 @@ def flatten_dict(value):
     for key, val in value.items():
         if not isinstance(val, collections_abc.Mapping):
             if key in top_level:
-                raise ValueError(
-                    "Duplicate entry for '%s' with different nesting" % key
-                )
+                raise ValueError(f"Duplicate entry for '{key}' with different nesting")
             top_level[key] = val
         else:
             val = flatten_dict(val)
             for vkey, vval in val.items():
-                vkey = "%s.%s" % (key, vkey)
+                vkey = f"{key}.{vkey}"
                 if vkey in top_level:
                     raise ValueError(
-                        "Duplicate entry for '%s' with different nesting" % vkey
+                        f"Duplicate entry for '{vkey}' with different nesting"
                     )
                 top_level[vkey] = vval
 
@@ -163,16 +161,9 @@ def json_dumps(value):
         # Need to call json.dumps() on values just in
         # case the given values aren't strings (even though
         # they should be according to the spec)
-        ordered_json = ",".join(
-            '"%s":%s'
-            % (
-                k,
-                json_dumps(v),
-            )
-            for k, v in ordered_fields
-        )
+        ordered_json = ",".join(f'"{k}":{json_dumps(v)}' for k, v in ordered_fields)
         if value:
-            return "{%s,%s" % (
+            return "{{{},{}".format(
                 ordered_json,
                 json_dumps(value)[1:],
             )
diff --git a/noxfile.py b/noxfile.py
index e5e30a1..a0a7082 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -32,11 +32,11 @@ def tests_impl(session):
         "--junitxml=junit-test.xml",
         "--cov=ecs_logging",
         *(session.posargs or ("tests/",)),
-        env={"PYTHONWARNINGS": "always::DeprecationWarning"}
+        env={"PYTHONWARNINGS": "always::DeprecationWarning"},
     )
 
 
-@nox.session(python=["2.7", "3.6", "3.7", "3.8"])
+@nox.session(python=["3.6", "3.7", "3.8", "3.9", "3.10"])
 def test(session):
     tests_impl(session)
 
@@ -44,7 +44,7 @@ def test(session):
 @nox.session()
 def blacken(session):
     session.install("black")
-    session.run("black", "--target-version=py27", *SOURCE_FILES)
+    session.run("black", "--target-version=py36", *SOURCE_FILES)
 
     lint(session)
 
@@ -52,7 +52,7 @@ def blacken(session):
 @nox.session
 def lint(session):
     session.install("flake8", "black", "mypy")
-    session.run("black", "--check", "--target-version=py27", *SOURCE_FILES)
+    session.run("black", "--check", "--target-version=py36", *SOURCE_FILES)
     session.run("flake8", "--ignore=E501,W503", *SOURCE_FILES)
     session.run(
         "mypy",
diff --git a/pyproject.toml b/pyproject.toml
index 4dd2450..5c97f24 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,6 @@ classifiers = [
   "Development Status :: 5 - Production/Stable",
   "Intended Audience :: Developers",
   "Programming Language :: Python :: 2",
-  "Programming Language :: Python :: 2.7",
   "Programming Language :: Python :: 3",
   "Programming Language :: Python :: 3.6",
   "Programming Language :: Python :: 3.7",
@@ -26,7 +25,7 @@ classifiers = [
 requires = [
   "backports.functools-lru-cache; python_version < '3.3'"
 ]
-requires-python = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*"
+requires-python = ">=3.6"
 
 [tool.flit.metadata.requires-extra]
 develop = [
diff --git a/tests/compat.py b/tests/compat.py
deleted file mode 100644
index 73e03e7..0000000
--- a/tests/compat.py
+++ /dev/null
@@ -1,25 +0,0 @@
-# Licensed to Elasticsearch B.V. under one or more contributor
-# license agreements. See the NOTICE file distributed with
-# this work for additional information regarding copyright
-# ownership. Elasticsearch B.V. licenses this file to you under
-# the Apache License, Version 2.0 (the "License"); you may
-# not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-# http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing,
-# software distributed under the License is distributed on an
-# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-# KIND, either express or implied.  See the License for the
-# specific language governing permissions and limitations
-# under the License.
-
-import sys
-
-if sys.version_info >= (3,):
-    from io import StringIO
-else:
-    from io import BytesIO as StringIO
-
-__all__ = ["StringIO"]
diff --git a/tests/conftest.py b/tests/conftest.py
index 45d6873..271668b 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -30,15 +30,9 @@ class ValidationError(Exception):
     pass
 
 
-if sys.version_info[0] >= 3:
-    basestring = str
-
-
 @pytest.fixture
 def spec_validator():
-    with open(
-        os.path.join(os.path.dirname(__file__), "resources", "spec.json"), "r"
-    ) as fh:
+    with open(os.path.join(os.path.dirname(__file__), "resources", "spec.json")) as fh:
         spec = json.load(fh)
 
     def validator(data_json):
@@ -63,13 +57,11 @@ def validator(data_json):
                     if subval:
                         found = True
                 if not found:
-                    raise ValidationError("Missing required key {}".format(k))
+                    raise ValidationError(f"Missing required key {k}")
             if k in data:
-                if v["type"] == "string" and not (
-                    isinstance(data[k], str) or isinstance(data[k], basestring)
-                ):
+                if v["type"] == "string" and not isinstance(data[k], str):
                     raise ValidationError(
-                        "Value {0} for key {1} should be string, is {2}".format(
+                        "Value {} for key {} should be string, is {}".format(
                             data[k], k, type(data[k])
                         )
                     )
@@ -78,12 +70,12 @@ def validator(data_json):
                         datetime.datetime.strptime(data[k], "%Y-%m-%dT%H:%M:%S.%fZ")
                     except ValueError:
                         raise ValidationError(
-                            "Value {0} for key {1} doesn't parse as an ISO datetime".format(
+                            "Value {} for key {} doesn't parse as an ISO datetime".format(
                                 data[k], k
                             )
                         )
             if v.get("index") and list(data.keys())[v.get("index")] != k:
-                raise ValidationError("Key {0} is not at index {1}".format(k, index))
+                raise ValidationError(f"Key {k} is not at index {index}")
 
         return data_json
 
@@ -92,12 +84,8 @@ def validator(data_json):
 
 @pytest.fixture
 def apm():
-    if sys.version_info < (3, 6):
-        pytest.skip("elasticapm only supports python 3.6+")
-    if sys.version_info[0] >= 3:
-        record_factory = logging.getLogRecordFactory()
+    record_factory = logging.getLogRecordFactory()
     apm = elasticapm.Client({"SERVICE_NAME": "apm-service", "DISABLE_SEND": True})
     yield apm
     apm.close()
-    if sys.version_info[0] >= 3:
-        logging.setLogRecordFactory(record_factory)
+    logging.setLogRecordFactory(record_factory)
diff --git a/tests/test_apm.py b/tests/test_apm.py
index 2d8c8b4..493954d 100644
--- a/tests/test_apm.py
+++ b/tests/test_apm.py
@@ -24,7 +24,7 @@
 import logging
 import structlog
 import pytest
-from .compat import StringIO
+from io import StringIO
 
 
 def test_elasticapm_structlog_log_correlation_ecs_fields(spec_validator, apm):
diff --git a/tests/test_stdlib_formatter.py b/tests/test_stdlib_formatter.py
index 2aca1b0..18cf555 100644
--- a/tests/test_stdlib_formatter.py
+++ b/tests/test_stdlib_formatter.py
@@ -17,23 +17,19 @@
 
 import logging
 import logging.config
-import mock
+from unittest import mock
 import pytest
 import json
 import time
 import random
 import sys
 import ecs_logging
-from .compat import StringIO
-
-requires_py3 = pytest.mark.skipif(
-    sys.version_info[0] < 3, reason="Test requires Python 3.x+"
-)
+from io import StringIO
 
 
 @pytest.fixture(scope="function")
 def logger():
-    return logging.getLogger("test-logger-%f-%f" % (time.time(), random.random()))
+    return logging.getLogger(f"test-logger-{time.time():f}-{random.random():f}")
 
 
 def make_record():
@@ -78,7 +74,7 @@ def test_extra_global_is_merged(spec_validator):
 def test_can_be_overridden(spec_validator):
     class CustomFormatter(ecs_logging.StdlibFormatter):
         def format_to_ecs(self, record):
-            ecs_dict = super(CustomFormatter, self).format_to_ecs(record)
+            ecs_dict = super().format_to_ecs(record)
             ecs_dict["custom"] = "field"
             return ecs_dict
 
@@ -311,7 +307,6 @@ def test_exclude_fields_type_and_values():
     assert str(e.value) == "'exclude_fields' must be a sequence of strings"
 
 
-@requires_py3
 def test_stack_info(logger):
     stream = StringIO()
     handler = logging.StreamHandler(stream)
@@ -327,7 +322,6 @@ def test_stack_info(logger):
     assert "test_stack_info" in error_stack_trace and __file__ in error_stack_trace
 
 
-@requires_py3
 @pytest.mark.parametrize("exclude_fields", [["error"], ["error.stack_trace"]])
 def test_stack_info_excluded(logger, exclude_fields):
     stream = StringIO()
diff --git a/tests/test_structlog_formatter.py b/tests/test_structlog_formatter.py
index 26ebcac..75b6f22 100644
--- a/tests/test_structlog_formatter.py
+++ b/tests/test_structlog_formatter.py
@@ -17,8 +17,8 @@
 
 import ecs_logging
 import structlog
-import mock
-from .compat import StringIO
+from unittest import mock
+from io import StringIO
 
 import pytest