diff --git a/.python-version b/.python-version
index 57ef42f..375f5ca 100644
--- a/.python-version
+++ b/.python-version
@@ -1 +1 @@
-cpython-x86_64-linux@3.12.0
+3.11.6
diff --git a/pyproject.toml b/pyproject.toml
index 95ed1a8..b656885 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,9 +17,6 @@ dependencies = [
 readme = "README.md"
 requires-python = ">= 3.9"
 
-[project.scripts]
-hello = "pymarginaleffects:hello"
-
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"
@@ -30,6 +27,8 @@ dev-dependencies = [
     "pytest>=7.4.3",
     "pytest-xdist>=3.5.0",
     "ruff>=0.1.9",
+    "pyfixest>=0.11.1",
+    "statsmodels>=0.14.1",
 ]
 
 [tool.hatch.metadata]
@@ -42,4 +41,4 @@ packages = ["src/pymarginaleffects"]
 ignore-init-module-imports = true
 
 [tool.ruff.extend-per-file-ignores]
-"__init__.py" = ["F401"]
\ No newline at end of file
+"__init__.py" = ["F401"]
diff --git a/requirements-dev.lock b/requirements-dev.lock
index a9346b1..d1b1a60 100644
--- a/requirements-dev.lock
+++ b/requirements-dev.lock
@@ -7,28 +7,81 @@
 #   all-features: false
 
 -e file:.
+astor==0.8.1
+build==1.0.3
+cachecontrol==0.13.1
+certifi==2023.11.17
+cffi==1.16.0
+charset-normalizer==3.3.2
+cleo==2.1.0
 contourpy==1.2.0
+crashtest==0.4.1
+cryptography==41.0.7
 cycler==0.12.1
+distlib==0.3.8
+dulwich==0.21.7
 execnet==2.0.2
+fastjsonschema==2.19.0
+filelock==3.13.1
 fonttools==4.47.0
+formulaic==0.6.6
+idna==3.6
+importlib-metadata==7.0.1
 iniconfig==2.0.0
+installer==0.7.0
+interface-meta==1.3.0
+jaraco-classes==3.3.0
+jeepney==0.8.0
+keyring==24.3.0
 kiwisolver==1.4.5
+lets-plot==4.1.0
+llvmlite==0.41.1
 matplotlib==3.8.2
+more-itertools==10.1.0
+msgpack==1.0.7
+numba==0.58.1
 numpy==1.26.2
 packaging==23.2
+palettable==3.3.3
 pandas==2.1.4
 patsy==0.5.4
+pexpect==4.9.0
 pillow==10.1.0
+pkginfo==1.9.6
+platformdirs==3.11.0
 pluggy==1.3.0
+poetry==1.7.1
+poetry-core==1.8.1
+poetry-plugin-export==1.6.0
 polars==0.20.2
+ptyprocess==0.7.0
 pyarrow==14.0.2
+pycparser==2.21
+pyfixest==0.11.1
+pyhdfe==0.2.0
 pyparsing==3.1.1
+pypng==0.20220715.0
+pyproject-hooks==1.0.0
 pytest==7.4.3
 pytest-xdist==3.5.0
 python-dateutil==2.8.2
 pytz==2023.3.post1
+rapidfuzz==3.5.2
+requests==2.31.0
+requests-toolbelt==1.0.0
 ruff==0.1.9
 scipy==1.11.4
+secretstorage==3.3.3
+shellingham==1.5.4
 six==1.16.0
 statsmodels==0.14.1
+tabulate==0.9.0
+tomlkit==0.12.3
+trove-classifiers==2023.11.29
+typing-extensions==4.9.0
 tzdata==2023.3
+urllib3==2.1.0
+virtualenv==20.25.0
+wildboottest==0.3.0
+wrapt==1.16.0
+zipp==3.17.0