diff --git a/arcade/pyproject.toml b/arcade/pyproject.toml
index eb1acd1c..09e3d33f 100644
--- a/arcade/pyproject.toml
+++ b/arcade/pyproject.toml
@@ -22,16 +22,17 @@ tomlkit = "^0.12.4"
 openai = "^1.36.0" # TODO: relax to an earlier version that still has what we need
 pyjwt = "^2.8.0"
 loguru = "^0.7.0"
+fastapi = {version = "^0.110.0", optional = true}
+scipy = {version = "^1.14.0", optional = true}
+numpy = {version = "^2.0.0", optional = true}
+scikit-learn = {version = "^1.5.0", optional = true}
 
-
-[tool.poetry.group.fastapi.dependencies]
-fastapi = "^0.110.0"
-
-[tool.poetry.group.flask.dependencies]
-flask = "^3.0.3"
+[tool.poetry.extras]
+fastapi = ["fastapi"]
+evals = ["scipy", "numpy", "scikit-learn"]
 
 [tool.poetry.group.dev.dependencies]
-pytest = "^8.1.1"
+pytest = "^8.1.2"
 pytest-cov = "^4.0.0"
 mypy = "^1.5.1"
 pre-commit = "^3.4.0"
@@ -43,10 +44,6 @@ mkdocs = ">=1.5.2"
 mkdocs-material = ">=9.3.0"
 mkdocstrings = {extras = ["python"], version = ">=0.23.1"}
 
-[tool.poetry.group.evals.dependencies]
-scipy = "^1.14.0"
-numpy = "^2.0.0"
-scikit-learn = "^1.5.0"
 
 [tool.poetry.scripts]
 arcade = "arcade.cli.main:cli"
diff --git a/arcade/tox.ini b/arcade/tox.ini
index eee70dd5..fc0917c3 100644
--- a/arcade/tox.ini
+++ b/arcade/tox.ini
@@ -12,6 +12,6 @@ python =
 passenv = PYTHON_VERSION
 allowlist_externals = poetry
 commands =
-    poetry install -v
+    poetry install -v --all-extras
     pytest --doctest-modules tests --cov --cov-config=pyproject.toml --cov-report=xml
 #    mypy