diff --git a/Makefile b/Makefile
index 866f3c9..02d1a74 100644
--- a/Makefile
+++ b/Makefile
@@ -3,9 +3,8 @@ all: release
 build: clean
 	# lint + unit tests + build egg (available in host ./dist)
 	dmake test build-egg
-	# + test egg on python 2 and 3 using egg from host
-	dmake test -s test-egg-py2:2.7
-	dmake test -s test-egg-py3:3.6
+	# + test egg on python 3 using egg from host
+	dmake test -s test-egg-py3:3.8
 
 clean:
 	rm -rf dist
diff --git a/README.md b/README.md
index 7585af8..c6252eb 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 
 This client have been made in order to help you integrating our services within your apps in python.
 
-Tested on python 2.7, 3.4, 3.5, 3.6.
+Tested on python 3.8, 3.9, 3.10, 3.11.
 
 # API Documentation
 
diff --git a/deepomatic/api/exceptions.py b/deepomatic/api/exceptions.py
index 97df5e4..f16c481 100644
--- a/deepomatic/api/exceptions.py
+++ b/deepomatic/api/exceptions.py
@@ -26,35 +26,25 @@
 from tenacity import RetryError
 
 
-###############################################################################
-
 class DeepomaticException(Exception):
     def __init__(self, msg):
         super(DeepomaticException, self).__init__(msg)
 
-###############################################################################
-
 
 class CredentialsNotFound(DeepomaticException):
     pass
 
 
-###############################################################################
-
 class UnimplementedException(DeepomaticException):
     def __init__(self, msg):
         super(UnimplementedException, self).__init__(msg)
 
 
-###############################################################################
-
 class NoData(DeepomaticException):
     def __init__(self):
         super(NoData, self).__init__("No data !! You may need to call '.retrieve()' ?")
 
 
-###############################################################################
-
 class BadStatus(DeepomaticException):
     """
     Thrown when HTTP response status_code < 200 or status_code >= 300.
@@ -93,8 +83,6 @@ class ServerError(BadStatus):
     pass
 
 
-###############################################################################
-
 class TaskError(DeepomaticException):
     def __init__(self, task):
         self.task = task
@@ -106,8 +94,6 @@ def get_task_id(self):
         return self.task['id']
 
 
-###############################################################################
-
 class TaskTimeout(DeepomaticException):
     def __init__(self, task, retry_error=None):
         self.task = task
@@ -120,9 +106,6 @@ def get_task_id(self):
         return self.task['id']
 
 
-###############################################################################
-
-
 class HTTPRetryError(RetryError):
     pass
 
diff --git a/deepomatic/api/inference.py b/deepomatic/api/inference.py
index 1c94f01..cfd8796 100644
--- a/deepomatic/api/inference.py
+++ b/deepomatic/api/inference.py
@@ -5,7 +5,7 @@
 
 class InferenceResource(object):
     def inference(self, return_task=False, wait_task=True, **kwargs):
-        assert(self._pk is not None)
+        assert (self._pk is not None)
 
         inputs = kwargs.pop('inputs', None)
         if inputs is None:
diff --git a/deepomatic/api/inputs.py b/deepomatic/api/inputs.py
index 5f0a338..ae1b91f 100644
--- a/deepomatic/api/inputs.py
+++ b/deepomatic/api/inputs.py
@@ -32,7 +32,7 @@
 ###############################################################################
 
 def format_inputs(inputs, data):
-    assert(isinstance(inputs, list))
+    assert (isinstance(inputs, list))
 
     data = copy.deepcopy(data)
     files = {}
diff --git a/deepomatic/api/mixins.py b/deepomatic/api/mixins.py
index a6857e2..9ddf478 100644
--- a/deepomatic/api/mixins.py
+++ b/deepomatic/api/mixins.py
@@ -58,7 +58,7 @@ def __init__(self):
 
 class UpdatableResource(object):
     def update(self, replace=False, content_type='application/json', files=None, **kwargs):
-        assert(self._pk is not None)
+        assert (self._pk is not None)
 
         if self._helper.check_query_parameters:
             for arg_name in kwargs:
@@ -78,7 +78,7 @@ def update(self, replace=False, content_type='application/json', files=None, **k
 
 class DeletableResource(object):
     def delete(self):
-        assert(self._pk is not None)
+        assert (self._pk is not None)
         return self._helper.delete(self._uri(pk=self._pk))
 
 
diff --git a/deepomatic/api/resource.py b/deepomatic/api/resource.py
index c52c473..c6bab3a 100644
--- a/deepomatic/api/resource.py
+++ b/deepomatic/api/resource.py
@@ -47,7 +47,7 @@ def retrieve(self, pk):
         return self.__class__(self._helper, pk=pk)
 
     def refresh(self):
-        assert(self._pk is not None)
+        assert (self._pk is not None)
         self._data = self._helper.get(self._uri(pk=self._pk))
         return self
 
diff --git a/deepomatic/api/resources/recognition.py b/deepomatic/api/resources/recognition.py
index 35005a0..5e1140f 100644
--- a/deepomatic/api/resources/recognition.py
+++ b/deepomatic/api/resources/recognition.py
@@ -55,7 +55,7 @@ def get_base_uri(cls, pk, public=False, **kwargs):
         return '/recognition/public/' if public else '/recognition/specs/'
 
     def versions(self, offset=0, limit=100):
-        assert(self._pk is not None)
+        assert (self._pk is not None)
         return ResourceList(RecognitionVersion, self._helper, self._uri(pk=self._pk, suffix='versions'), offset, limit)
 
 
diff --git a/deepomatic/api/resources/task.py b/deepomatic/api/resources/task.py
index 56bc119..52b0f71 100644
--- a/deepomatic/api/resources/task.py
+++ b/deepomatic/api/resources/task.py
@@ -77,7 +77,7 @@ def list(self, task_ids):
         """
         Returns a list of tasks
         """
-        assert(isinstance(task_ids, list))
+        assert (isinstance(task_ids, list))
         return super(Task, self).list(task_ids=task_ids)
 
     def wait(self, **retry_kwargs):
diff --git a/demo.py b/demo.py
index 1f7013a..b3650ff 100644
--- a/demo.py
+++ b/demo.py
@@ -343,11 +343,11 @@ def demo(client=None):
 
     # pending_tasks, error_tasks and success_tasks contains the original offset of the input parameter tasks
     for pos, pending in pending_tasks:
-        assert(tasks[pos].pk == pending.pk)
+        assert (tasks[pos].pk == pending.pk)
     for pos, err in error_tasks:
-        assert(tasks[pos].pk == err.pk)
+        assert (tasks[pos].pk == err.pk)
     for pos, success in success_tasks:
-        assert(tasks[pos].pk == success.pk)
+        assert (tasks[pos].pk == success.pk)
 
 ###########
 # Helpers #
diff --git a/deploy/Dockerfile b/deploy/Dockerfile
index 7cb1700..d7272ed 100644
--- a/deploy/Dockerfile
+++ b/deploy/Dockerfile
@@ -18,17 +18,7 @@ RUN python setup.py bdist_wheel
 
 # ideally use ROOT_IMAGE but it's not yet doable in dmake
 # => manually force root image here
-FROM python:2.7 as runtime-py2
-
-WORKDIR /app
-# don't copy egg there: use universal egg from `build-egg` service at runtime
-# prepare egg test: demo.py
-COPY --from=build /app/demo.py /app/
-
-
-# ideally use ROOT_IMAGE but it's not yet doable in dmake
-# => manually force root image here
-FROM python:3.6 as runtime-py3
+FROM python:3.8 as runtime-py3
 
 WORKDIR /app
 # don't copy egg there: use universal egg from `build-egg` service at runtime
diff --git a/dmake.yml b/dmake.yml
index 473e42f..5788288 100644
--- a/dmake.yml
+++ b/dmake.yml
@@ -11,7 +11,6 @@ env:
     master:
       source: ${DEEPOMATIC_CONFIG_DIR}/prod.sh
 
-
 docker:
   base_image:
     # This first item is a YAML template named "base_image"
@@ -19,8 +18,8 @@ docker:
     # "- <<: *base_image" as used below.
     - &base_image
       name: deepomatic-client-python
-      variant: '2.7'
-      root_image: python:2.7
+      variant: '3.8'
+      root_image: python:3.8
       copy_files:
         - requirements.txt
         - requirements.dev.txt
@@ -28,15 +27,14 @@ docker:
         - deploy/install.sh
     # Nothing changes comparing to above, except 'variant' and 'root_image'
     - <<: *base_image
-      variant: '3.4'
-      root_image: python:3.4
+      variant: '3.9'
+      root_image: python:3.9
     - <<: *base_image
-      variant: '3.5'
-      root_image: python:3.5
+      variant: '3.10'
+      root_image: python:3.10
     - <<: *base_image
-      variant: '3.6'
-      root_image: python:3.6
-
+      variant: '3.11'
+      root_image: python:3.11
 
 services:
   - service_name: client
@@ -47,10 +45,10 @@ services:
           dockerfile: deploy/Dockerfile
           target: dev
         base_image_variant:
-          - '2.7'
-          - '3.4'
-          - '3.5'
-          - '3.6'
+          - '3.8'
+          - '3.9'
+          - '3.10'
+          - '3.11'
     tests:
       commands:
         - LOG_LEVEL=DEBUG pytest --junit-xml=junit.xml --cov=. --cov-report=xml:coverage.xml --cov-report html:cover -vv /app/tests
@@ -63,17 +61,17 @@ services:
   - service_name: build-egg
     # unit tests must have passed on all supported platforms to build the universal egg
     needed_services:
-      - client:2.7
-      - client:3.4
-      - client:3.5
-      - client:3.6
+      - client:3.8
+      - client:3.9
+      - client:3.10
+      - client:3.11
     config:
       docker_image:
         build:
           context: .
           dockerfile: deploy/Dockerfile
           target: build
-        base_image_variant: '3.6'
+        base_image_variant: '3.8'
     tests:
       # TODO follow up on https://github.com/Deepomatic/dmake/issues/311
       data_volumes:
@@ -85,27 +83,6 @@ services:
         - cp /app/dist/* /dist
         - chmod -R a+w /dist
 
-  - service_name: test-egg-py2
-    needed_services:
-      - build-egg
-    config:
-      docker_image:
-        build:
-          context: .
-          dockerfile: deploy/Dockerfile
-          target: runtime-py2
-        # only used by dmake shell; bypassed by runtime-py2 Dockerfile target
-        base_image_variant:
-          - '2.7'
-    tests:
-      data_volumes:
-       - container_volume: /dist/
-         source: ./dist/
-      commands:
-        - pip install /dist/deepomatic_api-*.whl
-        - LOG_LEVEL=DEBUG python /app/demo.py
-
-
   - service_name: test-egg-py3
     needed_services:
       - build-egg
@@ -117,7 +94,7 @@ services:
           target: runtime-py3
         # only used by dmake shell; bypassed by runtime-py3 Dockerfile target
         base_image_variant:
-          - '3.6'
+          - '3.8'
     tests:
       data_volumes:
        - container_volume: /dist/
diff --git a/requirements.dev.txt b/requirements.dev.txt
index a579324..d1c3a38 100644
--- a/requirements.dev.txt
+++ b/requirements.dev.txt
@@ -1,6 +1,6 @@
 -r requirements.txt
-pytest==4.6.5
-pytest-cov==2.7.1
-pytest-voluptuous==1.1.0
-httpretty==0.9.6
-flake8==3.8.4
+pytest==7.4.3
+pytest-cov==4.1.0
+pytest-voluptuous==1.2.0
+httpretty==1.1.4
+flake8==6.1.0
diff --git a/requirements.txt b/requirements.txt
index 8721b2c..db6096a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,4 @@
 numpy>=1.10.0,<2
-promise>=2.1,<3
 six>=1.10.0,<2
 requests>=2.19.0,<3  # will not work below in python3
 tenacity>=5.1,<9
diff --git a/setup.py b/setup.py
index f0d6af7..77c0c66 100644
--- a/setup.py
+++ b/setup.py
@@ -37,16 +37,14 @@
     long_description_content_type='text/markdown',
     data_files=[('', ['requirements.txt'])],
     install_requires=requirements,
-    python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*",
+    python_requires=">=3.8.*",
     classifiers=[
         'Operating System :: OS Independent',
         'Programming Language :: Python',
-        'Programming Language :: Python :: 2',
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.4',
-        'Programming Language :: Python :: 3.5',
-        'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
+        'Programming Language :: Python :: 3.11',
     ]
 )
diff --git a/tests/test_client.py b/tests/test_client.py
index d02b315..598cca7 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -294,11 +294,11 @@ def test_batch_wait(self, client):
 
         # pending_tasks, error_tasks and success_tasks contains the original offset of the input parameter tasks
         for pos, pending in pending_tasks:
-            assert(tasks[pos].pk == pending.pk)
+            assert (tasks[pos].pk == pending.pk)
         for pos, err in error_tasks:
-            assert(tasks[pos].pk == err.pk)
+            assert (tasks[pos].pk == err.pk)
         for pos, success in success_tasks:
-            assert(tasks[pos].pk == success.pk)
+            assert (tasks[pos].pk == success.pk)
             assert inference_schema(2, 0, 'golden retriever', 0.8) == success['data']
 
         # Task* str(): oneliners (easier to parse in log tooling)