diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 13614d2..4229aac 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -10,6 +10,13 @@ jobs:
       - name: Check out repository code
         uses: actions/checkout@v4
 
+      - name: Install uv with cache
+        uses: astral-sh/setup-uv@v5
+        with:
+          version: "0.6.2"
+          enable-cache: true
+          cache-dependency-glob: "uv.lock"
+
       - name: Install nox
         uses: wntrblm/nox@2025.02.09
 
diff --git a/.gitignore b/.gitignore
index 739f35e..f3b7177 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,8 @@
 *__pycache__/
 poetry.lock
 dist/
-.idea/
\ No newline at end of file
+.idea/
+.venv/
+uv.lock
+ifdo.egg-info/
+build/
\ No newline at end of file
diff --git a/ifdo/models.py b/ifdo/models.py
index 8c93059..a348844 100644
--- a/ifdo/models.py
+++ b/ifdo/models.py
@@ -53,7 +53,8 @@
 
 from pydantic import BaseModel, Field, field_validator
 from stringcase import spinalcase
-from yaml import safe_dump, safe_load
+from yaml import safe_dump as yaml_dump, safe_load as yaml_load
+from json import dump as json_dump, load as json_load
 
 from ifdo.model import model
 
@@ -962,8 +963,8 @@ class iFDO:  # noqa: N801
         image_set_items (dict[str, list[ImageData]]): A dictionary mapping keys to lists of ImageData objects.
 
     Methods:
-        load(path: str | Path) -> 'iFDO': Class method to load an iFDO object from a YAML file.
-        save(path: str | Path) -> None: Instance method to save the iFDO object to a YAML file.
+        load(path: str | Path) -> 'iFDO': Class method to load an iFDO object from a YAML or JSON file.
+        save(path: str | Path) -> None: Instance method to save the iFDO object to a YAML or JSON file.
 
     Example:
         # Load an existing iFDO from a YAML file
@@ -983,26 +984,47 @@ class iFDO:  # noqa: N801
     @classmethod
     def load(cls, path: str | Path) -> "iFDO":
         """
-        Load an iFDO from a YAML file.
+        Load an iFDO from a YAML or JSON file.
 
         Args:
-            path: Path to the YAML file.
+            path: Path to the file. Should have a suffix of `.yaml`, `.yml`, or `.json`.
 
         Returns:
             The loaded iFDO object.
+
+        Raises:
+            ValueError: If the file format is not supported.
         """
         path = Path(path)  # Ensure Path object
         with path.open() as f:
-            d = safe_load(f)
+            suffix = path.suffix.lower().lstrip(".")
+            if suffix in ("yaml", "yml"):
+                d = yaml_load(f)
+            elif suffix == "json":
+                d = json_load(f)
+            else:
+                raise ValueError("Unsupported file format. Use YAML (.yaml, .yml) or JSON (.json).")
+
         return cls.from_dict(d)
 
     def save(self, path: str | Path) -> None:
         """
-        Save to a YAML file.
+        Save to a YAML or JSON file. Should have a suffix of `.yaml`, `.yml`, or `.json`.
 
         Args:
-            path: Path to the YAML file.
+            path: Path to the file.
+
+        Raises:
+            ValueError: If the file format is not supported
         """
         path = Path(path)  # Ensure Path object
         with path.open("w") as f:
-            safe_dump(self.to_dict(), f, sort_keys=False)
+            suffix = path.suffix.lower().lstrip(".")
+            if suffix in ("yaml", "yml"):
+                yaml_dump(self.to_dict(), f, sort_keys=False)
+            elif suffix == "json":
+                json_dump(self.to_dict(), f, indent=2)
+            else:
+                raise ValueError(
+                    "Unsupported file format. Use YAML (.yaml, .yml) or JSON (.json).",
+                )
diff --git a/noxfile.py b/noxfile.py
index 6c0cc10..bfcafda 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -1,6 +1,9 @@
-from nox import session
+import nox
 
-@session(python=["3.10", "3.11", "3.12", "3.13"])
+
+nox.options.default_venv_backend = "uv"
+
+@nox.session(python=["3.10", "3.11", "3.12", "3.13"])
 def tests(session):
     session.install("pytest", "jsonschema", ".")
     session.run("pytest")
diff --git a/pyproject.toml b/pyproject.toml
index b31f88e..d657c26 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,31 +1,38 @@
-[tool.poetry]
+[project]
 name = "ifdo"
 version = "1.2.5"
 description = "Python iFDO implementation"
+readme = "README.md"
 authors = [
-    "Kevin Barnard <kbarnard@mbari.org>",
-    "Chris Jackett <chris.jackett@csiro.au>",
+    {name = "Kevin Barnard", email = "kbarnard@mbari.org"},
+    {name = "Chris Jackett", email = "chris.jackett@csiro.au"},
+    {name = "Karsten Schimpf", email = "karsten.schimpf@awi.de"},
+]
+license = {text = "MIT"}
+requires-python = ">=3.10"
+
+dependencies = [
+    "stringcase<2.0.0,>=1.2.0",
+    "pyyaml<7.0,>=6.0",
+    "pydantic<3.0.0,>=2.4.2",
+]
+
+[dependency-groups]
+dev = [
+    "pre-commit<5.0.0,>=4.0.1",
+    "ruff<1.0.0,>=0.7.3",
+    "black<25.0.0,>=24.10.0",
+    "mypy<2.0.0,>=1.13.0",
+    "bandit<2.0.0,>=1.7.10",
+    "types-pyyaml<7.0.0.0,>=6.0.12.20240917",
+    "pytest<9.0.0,>=8.3.4",
+    "nox<2026.0.0,>=2025.2.9",
+    "jsonschema<5.0.0,>=4.23.0"
 ]
-license = "MIT"
-readme = "README.md"
 
-[tool.poetry.dependencies]
-python = "^3.10"
-stringcase = "^1.2.0"
-pyyaml = "^6.0"
-pydantic = "^2.4.2"
+[tool.uv]
+package=true
 
-[tool.poetry.group.dev.dependencies]
-pre-commit = "^4.0.1"
-ruff = "^0.7.3"
-black = "^24.10.0"
-mypy = "^1.13.0"
-bandit = "^1.7.10"
-types-pyyaml = "^6.0.12.20240917"
-pytest = "^8.3.4"
-nox = "^2025.2.9"
-jsonschema = "^4.23.0"
+[tool.setuptools.packages.find]
+include = ["ifdo*"]
 
-[build-system]
-requires = ["poetry-core"]
-build-backend = "poetry.core.masonry.api"