diff --git a/.github/workflows/cd.yml b/.github/workflows/cd.yml
index adafe1f5b..51f241d9d 100644
--- a/.github/workflows/cd.yml
+++ b/.github/workflows/cd.yml
@@ -8,7 +8,7 @@ env:
   CD: "true"
   ACTIONS_STEP_DEBUG: ${{ secrets.ACTIONS_STEP_DEBUG }}
   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-  PYTHON_DEFAULT_VERSION: "3.11"
+  PYTHON_DEFAULT_VERSION: "3.12"
 
 jobs:
   deploy:
@@ -54,7 +54,7 @@ jobs:
     needs: deploy
     runs-on: ubuntu-latest
     container:
-      image: "python:3.11"  # can not use ${{ env.PYTHON_DEFAULT_VERSION }} here
+      image: "python:3.12"  # can not use ${{ env.PYTHON_DEFAULT_VERSION }} here
       env:
         DEBIAN_FRONTEND: noninteractive
     steps:
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 64d7b7883..cc21f907a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,7 +7,7 @@ on:
     branches: [master]
 
 env:
-  PYTHON_DEFAULT_VERSION: "3.11"
+  PYTHON_DEFAULT_VERSION: "3.12"
 
 jobs:
   lint:
@@ -104,7 +104,7 @@ jobs:
         run: nox -vs integration -- -m "not require_secrets"
       - name: Run integration tests (with secrets)
         # Limit CI workload by running integration tests with secrets only on edge Python versions.
-        if: ${{ env.B2_TEST_APPLICATION_KEY != '' && env.B2_TEST_APPLICATION_KEY_ID != '' && contains(fromJSON('["3.7", "pypy-3.10-nightly", "3.11"]'), matrix.python-version) }}
+        if: ${{ env.B2_TEST_APPLICATION_KEY != '' && env.B2_TEST_APPLICATION_KEY_ID != '' && contains(fromJSON('["3.7", "pypy-3.10-nightly", "3.12"]'), matrix.python-version) }}
         run: nox -vs integration -- -m "require_secrets" --cleanup
   test-docker:
     needs: cleanup_buckets
@@ -147,7 +147,7 @@ jobs:
       B2_TEST_APPLICATION_KEY_ID: ${{ secrets.B2_TEST_APPLICATION_KEY_ID }}
     runs-on: ubuntu-latest
     container:
-      image: "python:3.11"  # can not use ${{ env.PYTHON_DEFAULT_VERSION }} here
+      image: "python:3.12"  # can not use ${{ env.PYTHON_DEFAULT_VERSION }} here
       env:
         DEBIAN_FRONTEND: noninteractive
     steps:
diff --git a/b2/console_tool.py b/b2/console_tool.py
index 37564fe1a..812dcdc9f 100644
--- a/b2/console_tool.py
+++ b/b2/console_tool.py
@@ -2004,7 +2004,7 @@ def timestamp_display(self, timestamp_or_none):
             return '-', '-'
         else:
             timestamp = timestamp_or_none
-            dt = datetime.datetime.utcfromtimestamp(timestamp / 1000)
+            dt = datetime.datetime.fromtimestamp(timestamp / 1000, datetime.timezone.utc)
             return dt.strftime('%Y-%m-%d'), dt.strftime('%H:%M:%S')
 
 
@@ -2216,7 +2216,7 @@ def format_folder_ls_entry(self, name, replication: bool):
         return self.LS_ENTRY_TEMPLATE % ('-', '-', '-', '-', 0, name)
 
     def format_ls_entry(self, file_version: FileVersion, replication: bool):
-        dt = datetime.datetime.utcfromtimestamp(file_version.upload_timestamp / 1000)
+        dt = datetime.datetime.fromtimestamp(file_version.upload_timestamp / 1000, datetime.timezone.utc)
         date_str = dt.strftime('%Y-%m-%d')
         time_str = dt.strftime('%H:%M:%S')
         size = file_version.size or 0  # required if self.action == 'hide'
diff --git a/changelog.d/+python3.12.infrastructure.md b/changelog.d/+python3.12.infrastructure.md
new file mode 100644
index 000000000..6b96af83a
--- /dev/null
+++ b/changelog.d/+python3.12.infrastructure.md
@@ -0,0 +1 @@
+Use cpython 3.12 (not 3.11) for integration tests with secrets
\ No newline at end of file
diff --git a/noxfile.py b/noxfile.py
index 2c0d5c974..cf3ac7b67 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -19,7 +19,6 @@
 from typing import List, Tuple
 
 import nox
-import pkg_resources
 
 CI = os.environ.get('CI') is not None
 CD = CI and (os.environ.get('CD') is not None)
@@ -33,9 +32,9 @@
     '3.9',
     '3.10',
     '3.11',
+    '3.12',
 ] if NOX_PYTHONS is None else NOX_PYTHONS.split(',')
 PYTHON_DEFAULT_VERSION = PYTHON_VERSIONS[-1]
-PYTHON_VERSIONS += ['3.12']  # move this into PYTHON_VERSION above after official 3.12 release
 
 PY_PATHS = ['b2', 'test', 'noxfile.py', 'setup.py']
 
@@ -114,7 +113,7 @@ def install_myself(session, extras=None):
         cwd = os.getcwd()
         os.chdir(INSTALL_SDK_FROM)
         session.run('pip', 'uninstall', 'b2sdk', '-y')
-        session.run('python', 'setup.py', 'develop')
+        session.run('pip', 'install', '-e', '.')
         os.chdir(cwd)
     elif CI and not CD:
         # In CI, install B2 SDK from the master branch
@@ -164,9 +163,8 @@ def lint(session):
     updated_requirements = os.path.join(session.create_tmp(), 'requirements.txt')
     with open('requirements.txt') as orig_req_file, \
             open(updated_requirements, 'w') as updated_req_file:
-        requirements = pkg_resources.parse_requirements(orig_req_file)
-        for requirement in requirements:
-            if requirement.project_name == "b2sdk":
+        for requirement in orig_req_file.readlines():
+            if requirement.startswith("b2sdk"):
                 updated_req_file.write("b2sdk\n")
             else:
                 updated_req_file.write(f"{requirement}\n")
diff --git a/requirements.txt b/requirements.txt
index 79f6c88b3..431d5a6be 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 argcomplete>=2,<4
 arrow>=1.0.2,<2.0.0
-b2sdk>=1.26.0,<2
+b2sdk @ git+https://github.com/reef-technologies/b2-sdk-python@32cd40e93458ed359000b21456a75226ac85c539
 docutils>=0.18.1
 idna~=3.4; platform_system == 'Java'
 importlib-metadata~=3.3; python_version < '3.8'