diff --git a/.github/workflows/pull-request.yaml b/.github/workflows/pull-request.yaml
index 2249c44b..fe08f535 100644
--- a/.github/workflows/pull-request.yaml
+++ b/.github/workflows/pull-request.yaml
@@ -52,7 +52,7 @@ jobs:
         run: poetry run pytest
 
       - name: Install tket2 dependencies
-        run: poetry install --extras=pytket
+        run: poetry install --with pytket
 
       - name: Rerun `py(...)` expression tests with tket2 installed
         run: poetry run pytest tests/integration/test_py.py tests/error/test_py_errors.py
diff --git a/README.md b/README.md
index 2675c763..f9898092 100644
--- a/README.md
+++ b/README.md
@@ -96,7 +96,7 @@ poetry run pytest -v
 You have to install extra dependencies to test automatic circuit conversion from `pytket`:
 
 ```sh
-poetry install --extras=pytket
+poetry install --with pytket
 poetry run pytest -v  # Now rerun tests
 ```
 
diff --git a/poetry.lock b/poetry.lock
index aab547c6..4bad347d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -842,7 +842,7 @@ mpmath = ">=0.19"
 name = "tket2-py"
 version = "0.0.0-alpha.1"
 description = "pytket extension for the tket 2 compiler"
-optional = true
+optional = false
 python-versions = ">=3.10"
 files = []
 develop = false
@@ -906,10 +906,7 @@ platformdirs = ">=3.9.1,<5"
 docs = ["furo (>=2023.7.26)", "proselint (>=0.13)", "sphinx (>=7.1.2)", "sphinx-argparse (>=0.4)", "sphinxcontrib-towncrier (>=0.2.1a0)", "towncrier (>=23.6)"]
 test = ["covdefaults (>=2.3)", "coverage (>=7.2.7)", "coverage-enable-subprocess (>=1)", "flaky (>=3.7)", "packaging (>=23.1)", "pytest (>=7.4)", "pytest-env (>=0.8.2)", "pytest-freezer (>=0.4.8)", "pytest-mock (>=3.11.1)", "pytest-randomly (>=3.12)", "pytest-timeout (>=2.1)", "setuptools (>=68)", "time-machine (>=2.10)"]
 
-[extras]
-pytket = ["pytket", "tket2-py"]
-
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.10"
-content-hash = "38603201ab598596fc0671e329e91573b78f55f1420767cfbffae55a291fe32c"
+content-hash = "f1ece99102a0240654d7058ebefd3eb8a48dfc9d1e6a30116e4e8b50bcc44d01"
diff --git a/pyproject.toml b/pyproject.toml
index b3cce387..35facba9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,8 +13,6 @@ graphviz = "^0.20.1"
 networkx = "^3.2.1"
 pydantic = "^2.5.3"
 typing-extensions = "^4.9.0"
-pytket = { version = "^1.24.0", optional = true }
-tket2-py = { git = "https://github.com/CQCL/tket2.git", optional = true, rev = "9e941f3" }
 
 [tool.poetry.group.dev.dependencies]
 pytest = "^7.4.4"
@@ -28,10 +26,15 @@ pytket = "*"
 optional = true
 
 [tool.poetry.group.validation.dependencies]
-guppyval = {path = "validator"}
+guppyval = { path = "validator" }
 
-[tool.poetry.extras]
-pytket = ["pytket", "tket2-py"]
+
+[tool.poetry.group.pytket]
+optional = true
+
+[tool.poetry.group.pytket.dependencies]
+pytket = { version = "^1.24.0" }
+tket2-py = {git = "https://github.com/CQCL/tket2.git", rev = "9e941f3"}
 
 
 [build-system]