diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 76ce671..893a651 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -3,7 +3,6 @@ on:
   pull_request:
     branches:
       - main
-      - release/**
   workflow_dispatch: {}
 
 jobs:
@@ -13,12 +12,13 @@ jobs:
     timeout-minutes: 5
     steps:
       - uses: actions/checkout@v7
+      - uses: astral-sh/setup-uv@v10.2.0
       - uses: actions/setup-python@v7
         with:
           python-version: "3.14"
-      - run: pip install --group lint -e .
-      - run: pre-commit run --all-files
-      - run: mypy looptime --strict
+      - run: uv sync --no-dev --group lint
+      - run: uv run --no-sync pre-commit run --all-files
+      - run: uv run --no-sync mypy
 
   unit-tests:
     strategy:
@@ -26,34 +26,35 @@ jobs:
       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" ]
-    name: Python ${{ matrix.python-version }}${{ matrix.install-extras && ', ' || '' }}${{ matrix.install-extras }}
+    name: Python ${{ matrix.python-version }}
     runs-on: ubuntu-26.04
     timeout-minutes: 5
     steps:
       - uses: actions/checkout@v7
+      - uses: astral-sh/setup-uv@v10.2.0
       - uses: actions/setup-python@v7
         with:
           python-version: ${{ matrix.python-version }}
 
-      - run: pip install --group dev -e .
-      - run: pip install "${{ matrix.install-extras }}"
-        if: ${{ matrix.install-extras }}
-      - run: pytest --color=yes --cov=looptime --cov-branch
+      - run: uv sync --no-dev --group test
+      - run: uv run --no-sync coverage run --branch --source=looptime -m pytest --color=yes
 
       - name: Publish coverage to Coveralls.io
+        uses: coverallsapp/github-action@v2
+        with:
+          parallel: true
+          flag-name: ${{ matrix.python-version }}
         if: success()
-        run: coveralls --service=github
-        env:
-          GITHUB_TOKEN: ${{ secrets.github_token }}
-        continue-on-error: true
+        continue-on-error: true  # tends to fail with no code changes (e.g. only CI/docs)
       - name: Publish coverage to CodeCov.io
-        uses: codecov/codecov-action@v3
-        if: success()
+        uses: codecov/codecov-action@v7
         env:
           PYTHON: ${{ matrix.python-version }}
         with:
           flags: unit
           env_vars: PYTHON
+          token: ${{ secrets.CODECOV_TOKEN }}
+        if: success()
         continue-on-error: true
 
   # No coverage: PyPy performs extremely poorly with tracing/coverage.
@@ -67,21 +68,20 @@ jobs:
     timeout-minutes: 5
     steps:
       - uses: actions/checkout@v7
+      - uses: astral-sh/setup-uv@v10.2.0
       - uses: actions/setup-python@v7
         with:
           python-version: ${{ matrix.python-version }}
 
-      - run: pip install --group dev -e .
-      - run: pytest --color=yes --no-cov
+      - run: uv sync --no-dev --group test
+      - run: uv run --no-sync pytest --color=yes --no-cov
 
   coveralls-finish:
     name: Finalize coveralls.io
     needs: [unit-tests]
     runs-on: ubuntu-26.04
     steps:
-      - uses: actions/setup-python@v7
-      - run: pip install coveralls
-      - run: coveralls --service=github --finish
-        env:
-          GITHUB_TOKEN: ${{ secrets.github_token }}
-        continue-on-error: true
+      - name: Finish coverage at Coveralls.io
+        uses: coverallsapp/github-action@v2
+        with:
+          parallel-finished: true
diff --git a/.github/workflows/thorough.yaml b/.github/workflows/thorough.yaml
index c99c308..3314b8b 100644
--- a/.github/workflows/thorough.yaml
+++ b/.github/workflows/thorough.yaml
@@ -3,7 +3,6 @@ on:
   push:
     branches:
       - main
-      - release/**
   schedule:
     - cron: "13 3 * * 6"
   workflow_dispatch: {}
@@ -15,12 +14,13 @@ jobs:
     timeout-minutes: 5
     steps:
       - uses: actions/checkout@v7
+      - uses: astral-sh/setup-uv@v10.2.0
       - uses: actions/setup-python@v7
         with:
           python-version: "3.14"
-      - run: pip install --group dev --group lint -e .
-      - run: pre-commit run --all-files
-      - run: mypy looptime --strict
+      - run: uv sync --no-dev --group lint
+      - run: uv run --no-sync pre-commit run --all-files
+      - run: uv run --no-sync mypy
 
   unit-tests:
     strategy:
@@ -33,27 +33,30 @@ jobs:
     timeout-minutes: 5
     steps:
       - uses: actions/checkout@v7
+      - uses: astral-sh/setup-uv@v10.2.0
       - uses: actions/setup-python@v7
         with:
           python-version: ${{ matrix.python-version }}
 
-      - run: pip install --group dev -e .
-      - run: pytest --color=yes --cov=looptime --cov-branch
+      - run: uv sync --no-dev --group test
+      - run: uv run --no-sync coverage run --branch --source=looptime -m pytest --color=yes
 
       - name: Publish coverage to Coveralls.io
+        uses: coverallsapp/github-action@v2
+        with:
+          parallel: true
+          flag-name: ${{ matrix.python-version }}
         if: success()
-        run: coveralls --service=github
-        env:
-          GITHUB_TOKEN: ${{ secrets.github_token }}
-        continue-on-error: true
+        continue-on-error: true  # tends to fail with no code changes (e.g. only CI/docs)
       - name: Publish coverage to CodeCov.io
-        uses: codecov/codecov-action@v3
-        if: success()
+        uses: codecov/codecov-action@v7
         env:
           PYTHON: ${{ matrix.python-version }}
         with:
           flags: unit
           env_vars: PYTHON
+          token: ${{ secrets.CODECOV_TOKEN }}
+        if: success()
         continue-on-error: true
 
   # No coverage: PyPy performs extremely poorly with tracing/coverage.
@@ -67,21 +70,20 @@ jobs:
     timeout-minutes: 5
     steps:
       - uses: actions/checkout@v7
+      - uses: astral-sh/setup-uv@v10.2.0
       - uses: actions/setup-python@v7
         with:
           python-version: ${{ matrix.python-version }}
 
-      - run: pip install --group dev -e .
-      - run: pytest --color=yes --no-cov
+      - run: uv sync --no-dev --group test
+      - run: uv run --no-sync pytest --color=yes --no-cov
 
   coveralls-finish:
     name: Finalize coveralls.io
     needs: [unit-tests]
     runs-on: ubuntu-26.04
     steps:
-      - uses: actions/setup-python@v7
-      - run: pip install coveralls
-      - run: coveralls --service=github --finish
-        env:
-          GITHUB_TOKEN: ${{ secrets.github_token }}
-        continue-on-error: true
+      - name: Finish coverage at Coveralls.io
+        uses: coverallsapp/github-action@v2
+        with:
+          parallel-finished: true
diff --git a/pyproject.toml b/pyproject.toml
index 5c31d74..d75f585 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,7 +50,7 @@ docs = [
     "sphinx-llm>=0.1.4",
     "furo",
 ]
-dev = [
+test = [
     "async-timeout",
     "codecov",
     "coverage",
@@ -61,19 +61,42 @@ dev = [
     "pytest-mock",
 ]
 lint = [
-    {include-group = "dev"},
+    {include-group = "test"},
     "mypy==2.3.1",
     "pre-commit",
     "isort",
 ]
+dev = [
+    {include-group = "docs"},
+    {include-group = "lint"},
+    {include-group = "test"},
+]
 
 [tool.setuptools_scm]
 version_file = "looptime/_version.py"
 
+[tool.uv]
+exclude-newer = "7 days"
+# MyPy is pinned, so the intent is explicit, no need for time constraints.
+exclude-newer-package = { mypy=false }
+
 [tool.mypy]
+strict = true
+packages = ["looptime"]
+exclude = ['(^|/)test_.*\.py$']
+python_version = "3.11"
+exclude_gitignore = true
 warn_unused_configs = true
 ignore_missing_imports = true
 
+[tool.pytest]
+minversion = "9.0"
+asyncio_mode = "auto"
+asyncio_default_fixture_loop_scope = "function"
+log_format = "%(asctime)s %(levelname)s %(message)s"
+log_date_format = "%Y-%m-%d %H:%M:%S"
+addopts = ["--strict-markers"]
+
 [tool.isort]
 line_length = 120
 multi_line_output = 11