diff --git a/.github/workflows/lockfiles.yml b/.github/workflows/lockfiles.yml
index 4e73eac..296acfe 100644
--- a/.github/workflows/lockfiles.yml
+++ b/.github/workflows/lockfiles.yml
@@ -18,15 +18,21 @@ jobs:
 
       - uses: actions/setup-python@v5
         with:
-          python-version-file: .python-version
+          python-version: "3.11"
 
-      - name: "Update Lockfiles and Open PR"
-        uses: tedivm/action-python-lockfile-update@v2
-        with:
-          pip_extras: "dev"
-          # This key will bypass workflow limitations to ensure tests are run.
-          # deploy_key: ${{ secrets.WRITEABLE_DEPLOY_KEY }}
+      - name: Install Poetry
+        run: pip install "poetry==1.8.3"
+
+      - name: Update Lockfile
+        run: poetry update
 
+      - name: Open PR with updated lockfile
+        uses: peter-evans/create-pull-request@v7
+        with:
+          commit-message: "Update poetry.lock"
+          branch: chore/update-lockfile
+          title: "Update poetry.lock"
+          body: "Automated dependency update via `poetry update`."
+          delete-branch: true
         env:
-          # Needed to open pull request- automatically set for all actions.
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/pypi.yml b/.github/workflows/pypi.yml
index 799289a..df61fd7 100644
--- a/.github/workflows/pypi.yml
+++ b/.github/workflows/pypi.yml
@@ -17,7 +17,9 @@ jobs:
           fetch-tags: true
       - uses: actions/setup-python@v5
         with:
-          python-version-file: .python-version
+          python-version: "3.11"
+      - name: Install Poetry
+        run: pip install poetry==1.8.3
       - name: Install Dependencies
         run: make install
       - name: Build Wheel
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index f349ee5..de8deef 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -29,7 +29,9 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version-file: .python-version
+          python-version: "3.11"
+      - name: Install Poetry
+        run: pip install poetry==1.8.3
       - name: Install Dependencies
         run: make install
       - name: Test
diff --git a/.gitignore b/.gitignore
index 6a7978e..e46b043 100644
--- a/.gitignore
+++ b/.gitignore
@@ -100,7 +100,7 @@ Pipfile.lock
 #   This is especially recommended for binary packages to ensure reproducibility, and is more
 #   commonly ignored for libraries.
 #   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
-#poetry.lock
+poetry.lock
 
 # pdm
 #   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
diff --git a/.python-version b/.python-version
deleted file mode 100644
index e4fba21..0000000
--- a/.python-version
+++ /dev/null
@@ -1 +0,0 @@
-3.12
diff --git a/README.md b/README.md
index 6d51dae..f19b815 100644
--- a/README.md
+++ b/README.md
@@ -15,24 +15,41 @@ postprocessing utilities.
 Development is a little weird if you're not used to modern python projects,
 especially because [python development and packaging evolves so
 quickly](https://dev.to/farcellier/i-migrate-to-poetry-in-2023-am-i-right--115).
-To isolate the development environment, `pyenv` and `pip`
-install a toolchain locally.
+To isolate the development environment, this project uses
+[Poetry](https://python-poetry.org/) to manage dependencies, virtual
+environments, and lockfiles.
 
 ## Setting up
 
 External dependencies (easily installed through [Homebrew](https://brew.sh/) or
 another package manager):
-- [pyenv](https://github.com/pyenv/pyenv), which will install its own python versions in an isolated environment
+- [Poetry](https://python-poetry.org/)
+- Python 3.11 or newer
 
 After cloning the repository, run `make pre-commit` to:
-- Install the development version of python specified in `.python-version` to
-  your `pyenv` prefix (default: `~/.pyenv`, configurable with the `PYENV_ROOT`
-  variable)
-- Set up a virtual environment in `.venv` that will contain all the development
-  dependencies, including a `celerpy` symlink in its environment that will
-  point to your working copy
-- Install pre-commit hooks that use the tools just installed in your virtual
-  environment.
+- Create and/or update the Poetry-managed virtual environment
+- Install all project and development dependencies from `poetry.lock`
+- Install pre-commit hooks.
+
+If you have multiple Python versions installed, you can select one explicitly
+for the project:
+```console
+$ poetry env use python3.11
+```
+
+## Versioning
+
+Package versions are generated dynamically from git tags using
+`poetry-dynamic-versioning`.
+
+- Tagged commits produce release versions (for example `v0.2.0` -> `0.2.0`)
+- Untagged commits use a derived pre-release/dev form from git history
+
+To create a new release tag:
+```console
+$ git tag v0.2.0
+$ git push origin v0.2.0
+```
 
 ## Testing and committing
 
@@ -43,14 +60,12 @@ automatically. (Use `git commit --no-verify` to disable.)
 The makefile specifies a few useful targets:
 - `style`: apply style fixups to all the python files in development
 - `test`: run tests
-- `pip`: reinstall all the dependencies in your virtual environment
-- `rebuild_dependencies`: update the `requirements` file if you add a new
-  dependency to `pyproject.toml`
+- `install`: install/update dependencies with Poetry
+- `rebuild_dependencies`: update dependencies and refresh `poetry.lock`
 
-You can also test independently once your virtual environment is set up. For
-example, to run a single python test function from a single python test, with
-the most verbose output and sending stdout/stderr to the console, run:
+You can also run tools directly through Poetry. For example, to run a single
+python test function from a single python test, with verbose output and sending
+stdout/stderr to the console, run:
 ```console
-$ . .venv/bin/activate
-$ pytest -vv -s test/test_process.py -k test_context
+$ poetry run pytest -vv -s test/test_process.py -k test_context
 ```
diff --git a/celerpy/__init__.py b/celerpy/__init__.py
index 437a732..9b50f71 100644
--- a/celerpy/__init__.py
+++ b/celerpy/__init__.py
@@ -1,12 +1,12 @@
 # Copyright 2024 UT-Battelle, LLC, and other Celeritas developers.
 # See the top-level LICENSE file for details.
 # SPDX-License-Identifier: Apache-2.0
-try:
-    from . import _version  # type: ignore[attr-defined]
+from importlib.metadata import PackageNotFoundError, version
 
-    __version__ = _version.__version__
-except:  # noqa: E722
-    __version__ = "0.0.0-dev"
+try:
+    __version__ = version("celerpy")
+except PackageNotFoundError:
+    __version__ = "0.1.0-dev"
 
 # Expose __version__ for type checkers
 __all__ = ["__version__"]
diff --git a/celerpy/cli.py b/celerpy/cli.py
index 9bb5cf4..4f50765 100644
--- a/celerpy/cli.py
+++ b/celerpy/cli.py
@@ -22,9 +22,9 @@ def load_settings():
 
 def print_version(value: bool):
     if value:
-        from . import _version
+        from . import __version__
 
-        typer.echo(_version.version)
+        typer.echo(__version__)
         raise typer.Exit()
 
 
diff --git a/makefile b/makefile
index 9ebcba0..2cec080 100644
--- a/makefile
+++ b/makefile
@@ -1,59 +1,22 @@
 PACKAGE_SLUG=celerpy
-ifdef CI
-	PYENV_TARGET:=
-	PYENV_PYTHON=python
-	PYTHON_VERSION:=$(shell $(PYENV_PYTHON) --version|cut -d" " -f2)
-else
-	PYENV_TARGET:=pyenv
-	PYENV_PYTHON:=pyenv exec python
-	PYTHON_VERSION:=$(shell cat .python-version)
-endif
-
-ifeq ($(USE_SYSTEM_PYTHON), true)
-	PYTHON_PACKAGE_PATH:=$(shell $(PYENV_PYTHON) -c "import sys; print(sys.path[-1])")
-	PYTHON_ENV:=
-	VENV_TARGET:=
-else
-	PYTHON_SHORT_VERSION:=$(shell echo $(PYTHON_VERSION) | grep -o '[0-9].[0-9]*')
-	PYTHON_PACKAGE_PATH:=.venv/lib/python$(PYTHON_SHORT_VERSION)/site-packages
-	PYTHON_ENV:=  . .venv/bin/activate &&
-	VENV_TARGET:= .venv
-endif
-
-PYTHON:=$(PYTHON_ENV) python
-
-# Used to confirm that pip has run at least once
-BUILD_DIR:=$(PYTHON_PACKAGE_PATH)/build
+PYTHON:=poetry run python
+PYTHON_ENV:=poetry run
 
 .PHONY: all
-all: $(PYENV_TARGET) $(BUILD_DIR)
+all: poetry.lock
 
 .PHONY: install
-install: $(PYENV_TARGET) $(VENV_TARGET) pip
+install: poetry-install
 
-.PHONY: pyenv
-pyenv:
-	pyenv install --skip-existing $(PYTHON_VERSION)
+.PHONY: poetry-install
+poetry-install:
+	poetry install
 
-.venv:
-	$(PYENV_PYTHON) -m venv .venv
+poetry.lock: pyproject.toml
+	poetry lock
 
-
-# Note that CI is defined when running through github actions
-.PHONY: pip
-pip: $(VENV_TARGET) pip-install
-
-.PHONY: pip-install
-pip-install:
-ifdef CI
-	$(PYTHON) -m pip install -r requirements-dev.txt
-else
-	$(PYTHON) -m pip install -e .[dev]
-endif
-
-$(BUILD_DIR): $(VENV_TARGET) pip-install
 .PHONY: pre-commit
-pre-commit: $(BUILD_DIR)
+pre-commit: poetry.lock
 	$(PYTHON_ENV) pre-commit install
 
 #
@@ -77,13 +40,13 @@ style/dapperdata:
 
 .PHONY: style/tomlsort
 style/tomlsort:
-	$(PYTHON_ENV) toml-sort $$(find . -not -path "./.venv/*" -name "*.toml") -i
+	$(PYTHON_ENV) toml-sort $$(find . -name "*.toml") -i
 
 #
 # Testing
 #
 .PHONY: test
-test: $(BUILD_DIR) test/all
+test: poetry.lock test/all
 
 .PHONY: test/all
 test/all: test/pytest test/ruff test/black test/mypy test/dapperdata test/tomlsort
@@ -114,28 +77,18 @@ test/dapperdata:
 
 .PHONY: test/tomlsort
 test/tomlsort:
-	$(PYTHON_ENV) toml-sort $$(find . -not -path "./.venv/*" -name "*.toml") --check
+	$(PYTHON_ENV) toml-sort $$(find . -name "*.toml") --check
 
 #
 # Dependencies
 #
 .PHONY: rebuild_dependencies
 rebuild_dependencies:
-	$(PYTHON) -m uv pip compile --output-file=requirements.txt pyproject.toml
-	$(PYTHON) -m uv pip compile --output-file=requirements-dev.txt --extra=dev pyproject.toml
-
-.PHONY: dependencies
-dependencies: requirements.txt requirements-dev.txt
-
-requirements.txt: $(BUILD_DIR) pyproject.toml
-	$(PYTHON) -m uv pip compile --upgrade --output-file=requirements.txt pyproject.toml
-
-requirements-dev.txt: $(BUILD_DIR) pyproject.toml
-	$(PYTHON) -m uv pip compile --upgrade --output-file=requirements-dev.txt --extra=dev pyproject.toml
+	poetry update
 
 #
 # Packaging
 #
 .PHONY: build
-build: $(BUILD_DIR)
-	$(PYTHON) -m build
+build: poetry.lock
+	poetry build
diff --git a/pyproject.toml b/pyproject.toml
index dff11c6..3d67be1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,48 +1,54 @@
 [build-system]
-build-backend = "setuptools.build_meta"
-requires = ["setuptools>=67.0", "setuptools_scm[toml]>=7.1"]
+build-backend = "poetry_dynamic_versioning.backend"
+requires = [
+  "poetry-core>=2.0.0,<3.0.0",
+  "poetry-dynamic-versioning>=1.9.1,<2.0.0"
+]
 
-[project]
-authors = [{"name" = "Seth R. Johnson et al."}]
+[tool.mypy]
+plugins = [
+  "pydantic.mypy"
+]
+
+[tool.poetry]
+authors = ["Seth R. Johnson et al."]
 description = ""
-dynamic = ["version"]
-license = {"file" = "LICENSE"}
+license = "Apache-2.0"
 name = "celerpy"
-readme = {file = "README.md", content-type = "text/markdown"}
-dependencies = [
-  "pydantic~=2.0",
-  "pydantic-settings",
-  "matplotlib>=3.7",
-  "numpy>=1.20",
-  "typer"
-]
+packages = [{include = "celerpy"}]
+readme = "README.md"
+requires-plugins = {poetry-dynamic-versioning = {version = ">=1.9.1,<2.0.0", extras = ["plugin"]}}
+version = "0.0.0"
 
-[project.optional-dependencies]
-dev = [
-  "build",
-  "dapperdata",
-  "glom",
-  "mypy",
-  "pre-commit",
-  "pytest",
-  "pytest-cov",
-  "pytest-pretty",
-  "ruamel.yaml",
-  "ruff",
-  "toml-sort",
-  "uv"
-]
+[tool.poetry.dependencies]
+matplotlib = ">=3.7"
+numpy = ">=1.20"
+pydantic = ">=2.0,<3.0"
+pydantic-settings = ">=2.0,<3.0"
+python = ">=3.11,<4.0"
+typer = "*"
+
+[tool.poetry.group.dev.dependencies]
+dapperdata = "0.4.0"
+glom = "24.11.0"
+mypy = "1.18.2"
+pre-commit = "4.3.0"
+pytest = "8.4.2"
+pytest-cov = "7.0.0"
+pytest-pretty = "1.3.0"
+"ruamel.yaml" = "0.18.15"
+ruff = "0.13.3"
+toml-sort = "0.24.3"
 
-[project.scripts]
+[tool.poetry.scripts]
 celerpy = "celerpy.cli:app"
 
-[tool.mypy]
-plugins = [
-  "pydantic.mypy"
-]
+[tool.poetry-dynamic-versioning]
+enable = true
+vcs = "git"
+style = "semver"
 
 [tool.ruff]
-exclude = [".venv", "./celerpy/_version.py"]
 line-length = 80
 indent-width = 4
 
@@ -61,16 +67,3 @@ select = [
   # isort
   "I"
 ]
-
-[tool.setuptools.dynamic]
-readme = {file = ["README.md"]}
-
-[tool.setuptools.package-data]
-celerpy = ["py.typed"]
-
-[tool.setuptools.packages]
-find = {}
-
-[tool.setuptools_scm]
-fallback_version = "0.0.0-dev"
-write_to = "celerpy/_version.py"
diff --git a/requirements-dev.txt b/requirements-dev.txt
deleted file mode 100644
index acb677c..0000000
--- a/requirements-dev.txt
+++ /dev/null
@@ -1,147 +0,0 @@
-# This file was autogenerated by uv via the following command:
-#    uv pip compile --output-file=requirements-dev.txt --extra=dev pyproject.toml
-annotated-types==0.7.0
-    # via pydantic
-attrs==25.3.0
-    # via glom
-boltons==25.0.0
-    # via
-    #   face
-    #   glom
-build==1.3.0
-    # via celerpy (pyproject.toml)
-cfgv==3.4.0
-    # via pre-commit
-click==8.3.0
-    # via typer
-contourpy==1.3.3
-    # via matplotlib
-coverage==7.10.7
-    # via pytest-cov
-cycler==0.12.1
-    # via matplotlib
-dapperdata==0.4.0
-    # via celerpy (pyproject.toml)
-distlib==0.4.0
-    # via virtualenv
-face==24.0.0
-    # via glom
-filelock==3.19.1
-    # via virtualenv
-fonttools==4.60.1
-    # via matplotlib
-glom==24.11.0
-    # via celerpy (pyproject.toml)
-identify==2.6.15
-    # via pre-commit
-iniconfig==2.1.0
-    # via pytest
-kiwisolver==1.4.9
-    # via matplotlib
-markdown-it-py==4.0.0
-    # via rich
-matplotlib==3.10.6
-    # via celerpy (pyproject.toml)
-mdurl==0.1.2
-    # via markdown-it-py
-mypy==1.18.2
-    # via celerpy (pyproject.toml)
-mypy-extensions==1.1.0
-    # via mypy
-nodeenv==1.9.1
-    # via pre-commit
-numpy==2.3.3
-    # via
-    #   celerpy (pyproject.toml)
-    #   contourpy
-    #   matplotlib
-packaging==25.0
-    # via
-    #   build
-    #   matplotlib
-    #   pytest
-pathspec==0.12.1
-    # via mypy
-pillow==11.3.0
-    # via matplotlib
-platformdirs==4.4.0
-    # via virtualenv
-pluggy==1.6.0
-    # via
-    #   pytest
-    #   pytest-cov
-pre-commit==4.3.0
-    # via celerpy (pyproject.toml)
-pydantic==2.11.10
-    # via
-    #   celerpy (pyproject.toml)
-    #   dapperdata
-    #   pydantic-settings
-pydantic-core==2.33.2
-    # via pydantic
-pydantic-settings==2.11.0
-    # via
-    #   celerpy (pyproject.toml)
-    #   dapperdata
-pygments==2.19.2
-    # via
-    #   pytest
-    #   rich
-pyparsing==3.2.5
-    # via matplotlib
-pyproject-hooks==1.2.0
-    # via build
-pytest==8.4.2
-    # via
-    #   celerpy (pyproject.toml)
-    #   pytest-cov
-    #   pytest-pretty
-pytest-cov==7.0.0
-    # via celerpy (pyproject.toml)
-pytest-pretty==1.3.0
-    # via celerpy (pyproject.toml)
-python-dateutil==2.9.0.post0
-    # via matplotlib
-python-dotenv==1.1.1
-    # via pydantic-settings
-pyyaml==6.0.3
-    # via pre-commit
-rich==14.1.0
-    # via
-    #   pytest-pretty
-    #   typer
-ruamel-yaml==0.18.15
-    # via
-    #   celerpy (pyproject.toml)
-    #   dapperdata
-ruamel-yaml-clib==0.2.14
-    # via ruamel-yaml
-ruff==0.13.3
-    # via celerpy (pyproject.toml)
-shellingham==1.5.4
-    # via typer
-six==1.17.0
-    # via python-dateutil
-toml-sort==0.24.3
-    # via celerpy (pyproject.toml)
-tomlkit==0.13.3
-    # via toml-sort
-typer==0.19.2
-    # via
-    #   celerpy (pyproject.toml)
-    #   dapperdata
-typing-extensions==4.15.0
-    # via
-    #   mypy
-    #   pydantic
-    #   pydantic-core
-    #   typer
-    #   typing-inspection
-typing-inspection==0.4.2
-    # via
-    #   pydantic
-    #   pydantic-settings
-uv==0.8.23
-    # via celerpy (pyproject.toml)
-virtualenv==20.34.0
-    # via pre-commit
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index 93d75e0..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,63 +0,0 @@
-# This file was autogenerated by uv via the following command:
-#    uv pip compile --output-file=requirements.txt pyproject.toml
-annotated-types==0.7.0
-    # via pydantic
-click==8.3.0
-    # via typer
-contourpy==1.3.3
-    # via matplotlib
-cycler==0.12.1
-    # via matplotlib
-fonttools==4.60.1
-    # via matplotlib
-kiwisolver==1.4.9
-    # via matplotlib
-markdown-it-py==4.0.0
-    # via rich
-matplotlib==3.10.6
-    # via celerpy (pyproject.toml)
-mdurl==0.1.2
-    # via markdown-it-py
-numpy==2.3.3
-    # via
-    #   celerpy (pyproject.toml)
-    #   contourpy
-    #   matplotlib
-packaging==25.0
-    # via matplotlib
-pillow==11.3.0
-    # via matplotlib
-pydantic==2.11.10
-    # via
-    #   celerpy (pyproject.toml)
-    #   pydantic-settings
-pydantic-core==2.33.2
-    # via pydantic
-pydantic-settings==2.11.0
-    # via celerpy (pyproject.toml)
-pygments==2.19.2
-    # via rich
-pyparsing==3.2.5
-    # via matplotlib
-python-dateutil==2.9.0.post0
-    # via matplotlib
-python-dotenv==1.1.1
-    # via pydantic-settings
-rich==14.1.0
-    # via typer
-shellingham==1.5.4
-    # via typer
-six==1.17.0
-    # via python-dateutil
-typer==0.19.2
-    # via celerpy (pyproject.toml)
-typing-extensions==4.15.0
-    # via
-    #   pydantic
-    #   pydantic-core
-    #   typer
-    #   typing-inspection
-typing-inspection==0.4.2
-    # via
-    #   pydantic
-    #   pydantic-settings