diff --git a/.github/workflows/gate.yml b/.github/workflows/gate.yml
index fc3c5b0..5e885ff 100644
--- a/.github/workflows/gate.yml
+++ b/.github/workflows/gate.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.11"]
+        python-version: ["3.9", "3.13"]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
@@ -23,7 +23,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: install
         run: |
-          pip3 install 'poetry<2.0.0'
+          pip3 install poetry
           poetry install --no-root
       - name: test
         run: |
diff --git a/README.md b/README.md
index 67d7f6b..355e655 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,9 @@ What the code in this repo actually does!
 
 ### prerequisites
 
+> [!NOTE]
+> Poetry 2 [introduced breaking changes](https://github.com/python-poetry/poetry/issues/9136) that are not backwards compatible with Poetry 1. The pyproject.toml is compatible with Poetry 2 only - this is installed by default using the below instructions, but if you are using an already-installed copy of Poetry you should make sure to upgrade it to version 2.
+
 - Install poetry https://python-poetry.org/docs/#installation
 
 - Run the following command to set up the dependencies
diff --git a/pyproject.toml b/pyproject.toml
index efe1890..fef6e40 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,20 +1,13 @@
 [project]
 name = "sheet-to-triples"
-license = {file="COPYING", name="GPL-3.0-or-later"}
+license = "GPL-3.0-or-later"
+license-files = ["COPYING"]
 version = "0.1.0"
 authors = [{"name"="Martin Packman", "email"="martin.packman@visual-meaning.com"}]
 description = "Convert tabular data into triples."
 
-# Poetry have their own build metadata block and can't use the one in [project]
-# TODO: Replace poetry with a dependency management tool that can.
-[tool.poetry]
-name = "sheet-to-triples"
-version = "0.1.0"
-authors = ["Martin Packman <martin.packman@visual-meaning.com>"]
-description = "Convert tabular data into triples."
-
 [tool.poetry.dependencies]
-python = "^3.8.10"
+python = "^3.9.13"
 pycountry = "^22"
 # openpyxl broke parsing some workbooks with filters and the maintainer made
 # the classic mistake of blocking the regression fix on a rethink of how
@@ -26,10 +19,10 @@ openpyxl = "=3.0.10"
 rdflib = {version = "^7", extras = ["sparql"]}
 xlrd = "^2"
 
-[tool.poetry.dev-dependencies]
+[tool.poetry.group.dev.dependencies]
 ruff = "^0.0.292"
 coverage = "^7"
-pyfakefs = "^5"
+pyfakefs = "^5.7.0"
 
 [tool.ruff]
 select = ["C9", "E", "F", "W"]