diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
index 7d15a161..8f83b5b8 100644
--- a/.github/workflows/python.yml
+++ b/.github/workflows/python.yml
@@ -21,7 +21,7 @@ permissions: {}
 
 env:
   REPORTS_DIR: CI_reports
-  PYTHON_VERSION_DEFAULT: "3.14"
+  PYTHON_VERSION_DEFAULT: "3.15"
   POETRY_VERSION: "1.8.1"
   TESTS_REPORTS_ARTIFACT: tests-reports
 
@@ -136,7 +136,7 @@ jobs:
         include:
           - # test with the latest dependencies
             os: ubuntu-latest
-            python-version: '3.14'
+            python-version: '3.15'
             toxenv-factors: '-current'
           - # test with the lowest dependencies
             os: ubuntu-24.04
@@ -175,7 +175,8 @@ jobs:
           - macos-latest
           - windows-latest
         python-version:
-          - "3.14" # highest supported
+          - "3.15" # highest supported
+          - "3.14"
           - "3.13"
           - "3.12"
           - "3.11"
@@ -291,7 +292,7 @@ jobs:
         # see https://github.com/actions/setup-python
         uses: actions/setup-python@6d4fd22b20465ccc0f7354476588e8df7c9ca0e0  # v7.1.0
         with:
-          python-version: '>=3.9 <=3.14'  # supported version range
+          python-version: '>=3.9 <=3.15'  # supported version range
       - name: Validate Python Environment
         shell: python
         run: |
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index ff7c7c7d..2e2ea775 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -39,7 +39,7 @@ concurrency:
 permissions: {}
 
 env:
-  PYTHON_VERSION_DEFAULT: "3.14"
+  PYTHON_VERSION_DEFAULT: "3.15"
   POETRY_VERSION: "1.8.1"
 
 jobs:
diff --git a/pyproject.toml b/pyproject.toml
index ed2ff9fd..b56c893d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,6 +53,7 @@ classifiers = [
   'Programming Language :: Python :: 3.12',
   'Programming Language :: Python :: 3.13',
   'Programming Language :: Python :: 3.14',
+  'Programming Language :: Python :: 3.15',
   'Typing :: Typed',
 ]
 keywords = [
diff --git a/tox.ini b/tox.ini
index af3be111..3a4ab325 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,7 +8,7 @@ minversion = 4.0
 envlist =
     flake8
     mypy-{current,lowest}
-    py{314,313,312,311,310,39}-{allExtras,noExtras}
+    py{315,314,313,312,311,310,39}-{allExtras,noExtras}
     bandit
     deptry
 skip_missing_interpreters = True