diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index fe3e26236..0f10e1e35 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -17,22 +17,24 @@ jobs:
     strategy:
       matrix:
         os-type: [ubuntu, macos, windows]
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.13t", "3.14", "3.14t"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14", "3.14t", "3.15", "3.15t"]
         exclude:
         - os-type: macos
           python-version: "3.7"  # Not available for the ARM-based macOS runners.
-        - os-type: macos
-          python-version: "3.13t"
         - os-type: macos
           python-version: "3.14t"
+        - os-type: macos
+          python-version: "3.15t"
         - os-type: windows
-          python-version: "3.13"  # FIXME: Fix and enable Python 3.13 and 3.14 on Windows (#1955).
-        - os-type: windows
-          python-version: "3.13t"
+          python-version: "3.13"  # FIXME: Fix and enable Python 3.13-3.15 on Windows (#1955).
         - os-type: windows
           python-version: "3.14"
         - os-type: windows
           python-version: "3.14t"
+        - os-type: windows
+          python-version: "3.15"
+        - os-type: windows
+          python-version: "3.15t"
         include:
         - os-ver: latest
         - os-type: ubuntu
@@ -44,6 +46,10 @@ jobs:
         - python-version: "3.8"
           build-docs: false
         - experimental: false
+        - python-version: "3.15"
+          experimental: true
+        - python-version: "3.15t"
+          experimental: true
 
       fail-fast: false
 
diff --git a/setup.py b/setup.py
index a7b1eab00..3a62a91fd 100755
--- a/setup.py
+++ b/setup.py
@@ -108,5 +108,8 @@ def _stamp_version(filename: str) -> None:
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
+        "Programming Language :: Python :: 3.14",
+        "Programming Language :: Python :: 3.15",
     ],
 )