diff --git a/.github/workflows/freebsd.yaml b/.github/workflows/freebsd.yaml
index 86b5c59..1abb7c7 100644
--- a/.github/workflows/freebsd.yaml
+++ b/.github/workflows/freebsd.yaml
@@ -21,16 +21,10 @@ jobs:
           python3.11 -m venv .venv
           . .venv/bin/activate
           pip install --upgrade pip
-          # Remove problematic python packages:
-          # - bpython: unnecessary, depends on greenlet and thus on a recent C++ compiler
-          # - ruff: depends on a Rust compiler
-          # - twine: unnecessary, depends on a Rust compiler
-          sed -i '' '/bpython/d; /ruff/d; /twine/d' requirements.txt
-          pip install -r requirements.txt
+          pip install -e .[bsd-ci]
           # no ruff, no ruff check
           mypy src/moulti
           pylint src/moulti
-          pip install -e .
           # This runs all tests except:
           # - test_diff_with_delta (requires delta 0.18.x)
           pytest -v
diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index d29e08e..91f8773 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -26,12 +26,11 @@ jobs:
       with:
         python-version: ${{matrix.python-version}}
         cache: pip
-    - run: pip install -r requirements.txt
+    - run: pip install -e .[ci]
     - run: ruff check src/moulti
     - run: mypy src/moulti
     - run: pylint src/moulti
     - run: ruff check tests
-    - run: pip install -e .
     # This runs all tests except:
     # - test_diff_with_delta (requires delta 0.18.x)
     - run: pytest -v
diff --git a/.github/workflows/netbsd.yaml b/.github/workflows/netbsd.yaml
index e2b9c5d..d584e4c 100644
--- a/.github/workflows/netbsd.yaml
+++ b/.github/workflows/netbsd.yaml
@@ -24,16 +24,10 @@ jobs:
           python3.11 -m venv .venv
           . .venv/bin/activate
           pip install --upgrade pip
-          # Remove problematic python packages:
-          # - bpython: unnecessary, depends on greenlet and thus on a recent C++ compiler
-          # - ruff: depends on a Rust compiler
-          # - twine: unnecessary, depends on a Rust compiler
-          sed -i '/bpython/d; /ruff/d; /twine/d' requirements.txt
-          pip install -r requirements.txt
+          pip install -e .[bsd-ci]
           # no ruff, no ruff check
           mypy src/moulti
           pylint src/moulti
-          pip install -e .
           # This runs all tests except:
           # - test_diff_with_delta (requires delta 0.18.x)
           pytest -v
diff --git a/.github/workflows/openbsd.yaml b/.github/workflows/openbsd.yaml
index 49b8947..4ae65f8 100644
--- a/.github/workflows/openbsd.yaml
+++ b/.github/workflows/openbsd.yaml
@@ -21,16 +21,10 @@ jobs:
           python3.11 -m venv .venv
           . .venv/bin/activate
           pip install --upgrade pip
-          # Remove problematic python packages:
-          # - bpython: unnecessary, depends on greenlet and thus on a recent C++ compiler
-          # - ruff: depends on a Rust compiler
-          # - twine: unnecessary, depends on a Rust compiler
-          sed -i '/bpython/d; /ruff/d; /twine/d' requirements.txt
-          pip install -r requirements.txt
+          pip install -e .[bsd-ci]
           # no ruff, no ruff check
           mypy src/moulti
           pylint src/moulti
-          pip install -e .
           # This runs all tests except:
           # - test_diff_with_delta (requires delta 0.18.x)
           pytest -v
diff --git a/pyproject.toml b/pyproject.toml
index e6dfd32..52e8176 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,6 +50,43 @@ classifiers = [
 	"Topic :: Utilities",
 ]
 
+[project.optional-dependencies]
+tinker = [
+	"bpython",
+	"textual-dev",
+]
+check-py = [
+	"mypy",
+	"pylint",
+]
+check-rust = [
+	"ruff",
+]
+check = [
+	"moulti[check-py,check-rust]",
+]
+test = [
+	"pytest",
+	"pytest-asyncio",
+	"pytest-forked",
+	"pytest-textual-snapshot @ git+https://github.com/textualize/pytest-textual-snapshot@19b2607c93b898cc67c6f9299f6236af5e994375",
+	"pytest-xdist",
+]
+release = [
+	"build",
+	"twine",
+]
+dev = [
+	"moulti[tinker,check,test,release]",
+]
+ci = [
+	"moulti[check,test]",
+]
+# Installing ruff on *BSD systems requires a Rust compiler + time + energy:
+bsd-ci = [
+	"moulti[check-py,test]",
+]
+
 [project.urls]
 Homepage = "https://github.com/xavierog/moulti/?tab=readme-ov-file#moulti"
 Documentation = "https://github.com/xavierog/moulti/blob/master/Documentation.md"
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index e6b9522..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,16 +0,0 @@
-argcomplete
-bpython
-build
-mypy
-pylint
-pyperclip
-pytest
-pytest-asyncio
-pytest-forked
-git+https://github.com/Textualize/pytest-textual-snapshot@19b2607c93b898cc67c6f9299f6236af5e994375
-pytest-xdist
-ruff
-textual-dev
-textual==1.0.*
-twine
-unidiff