diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 5c1883f..3fb0e0d 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -16,7 +16,7 @@ jobs:
         with:
           github-token: ${{ github.token }}
           enable-cache: true
-          python-version: "3.14"
+          python-version: "3.15"
           activate-environment: true
       - run: uv sync --no-dev --group lint
       - run: pre-commit run --all-files
@@ -27,7 +27,7 @@ jobs:
       fail-fast: false
       matrix:
         # Assumption: if free-threaded works in one version, it works in all versions.
-        python-version: [ "3.11", "3.12", "3.13", "3.14", "3.14t" ]
+        python-version: [ "3.11", "3.12", "3.13", "3.14", "3.15", "3.15t" ]
     name: Python ${{ matrix.python-version }}
     runs-on: ubuntu-26.04
     timeout-minutes: 5
diff --git a/.github/workflows/publish.yaml b/.github/workflows/publish.yaml
index f147e18..93650b1 100644
--- a/.github/workflows/publish.yaml
+++ b/.github/workflows/publish.yaml
@@ -20,7 +20,7 @@ jobs:
         with:
           github-token: ${{ github.token }}
           enable-cache: true
-          python-version: "3.14"
+          python-version: "3.15"
           activate-environment: true
       - run: uv build
       - uses: pypa/gh-action-pypi-publish@release/v1
diff --git a/.github/workflows/thorough.yaml b/.github/workflows/thorough.yaml
index 02dfc89..5c35842 100644
--- a/.github/workflows/thorough.yaml
+++ b/.github/workflows/thorough.yaml
@@ -18,7 +18,7 @@ jobs:
         with:
           github-token: ${{ github.token }}
           enable-cache: true
-          python-version: "3.14"
+          python-version: "3.15"
           activate-environment: true
       - run: uv sync --no-dev --group lint
       - run: pre-commit run --all-files
@@ -29,7 +29,7 @@ jobs:
       fail-fast: false
       matrix:
         # Assumption: if free-threaded works in one version, it works in all versions.
-        python-version: [ "3.11", "3.12", "3.13", "3.14", "3.14t" ]
+        python-version: [ "3.11", "3.12", "3.13", "3.14", "3.15", "3.15t" ]
     name: Python ${{ matrix.python-version }}
     runs-on: ubuntu-26.04
     timeout-minutes: 5
diff --git a/looptime/_internal/plugin.py b/looptime/_internal/plugin.py
index 891552c..076dde1 100644
--- a/looptime/_internal/plugin.py
+++ b/looptime/_internal/plugin.py
@@ -108,7 +108,6 @@
 from __future__ import annotations
 
 import asyncio
-import sys
 from typing import Any
 
 import _pytest.nodes
diff --git a/pyproject.toml b/pyproject.toml
index d75f585..b9b0551 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,6 +22,7 @@ classifiers = [
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: 3.14",
+    "Programming Language :: Python :: 3.15",
     "Programming Language :: Python :: 3 :: Only",
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",