diff --git a/.github/workflows/doctest.yml b/.github/workflows/doctest.yml
index 1bb29c70392..829ec16aa79 100644
--- a/.github/workflows/doctest.yml
+++ b/.github/workflows/doctest.yml
@@ -31,11 +31,11 @@ jobs:
           setup.py
           pyproject.toml
           dev-requirements.txt
-    - run: pip install -e .
+    - run: pip install -e ".[dev]"
 
-    - name: Install with dependencies
-      run: |
-        pip install -r dev-requirements.txt
+    # - name: Install with dependencies
+    #   run: |
+    #     pip install -r dev-requirements.txt
 
     - name: Test doctest
       run: |
diff --git a/pyproject.toml b/pyproject.toml
index 0359f64e633..f052c26fc8d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -94,6 +94,44 @@ ert = "ert.__main__:main"
 [project.urls]
 Repository = "https://github.com/equinor/ert"
 
+[project.optional-dependencies]
+dev = [
+    "click",
+    "decorator",
+    "ecl_data_io",
+    "furo",
+    "flaky",
+    "grpcio-tools",
+    "hypothesis<=6.83.0; python_version=='3.8'",  # ipython pinned to 8.12.2 for python 3.8 support
+    "hypothesis; python_version>='3.9'",
+    "jsonpath_ng",
+    "jupytext",
+    "oil_reservoir_synthesizer",
+    "pytest-asyncio",
+    "pytest-benchmark",
+    "pytest-cov",
+    "pytest-memray",
+    "pytest-mock",
+    "pytest-mpl",
+    "pytest-qt",
+    "pytest-raises",
+    "pytest-snapshot",
+    "pytest-timeout",
+    "pytest-xdist",
+    "pytest>6",
+    "requests",
+    "scikit-build",
+    "setuptools_scm",
+    "sortedcontainers",
+    "sphinx<7.2",
+    "sphinx-argparse",
+    "sphinx-autoapi",
+    "sphinx-copybutton",
+    "sphinxcontrib-plantuml",
+    "sphinxcontrib.datatemplates",
+    "testpath",
+]
+
 [tool.setuptools]
 platforms = ["all"]