diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
index c5fc677..cea45d7 100644
--- a/.github/workflows/python.yml
+++ b/.github/workflows/python.yml
@@ -18,7 +18,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: 3.11
+          python-version: 3.13
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
@@ -35,17 +35,17 @@ jobs:
     needs: Build
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11"]
+        python-version: ["3.11", "3.12", "3.13"]
         os: [ubuntu-latest, windows-latest, macos-latest]
         exclude:
           - os: windows-latest
-            python-version: "3.10"
+            python-version: "3.12"
           - os: windows-latest
-            python-version: "3.11"
+            python-version: "3.13"
           - os: macos-latest
-            python-version: "3.10"
+            python-version: "3.12"
           - os: macos-latest
-            python-version: "3.11"
+            python-version: "3.13"
     runs-on: ${{ matrix.os }}
     # runs-on: ubuntu-latest
     steps:
@@ -75,7 +75,7 @@ jobs:
 
   pypi-publish:
     name: Upload release to PyPI
-    needs: test
+    needs: Test
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
     runs-on: ubuntu-latest
     environment:
diff --git a/HISTORY.rst b/HISTORY.rst
index 68ac780..ac984c4 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -7,6 +7,7 @@ History
 * fast_dp no longer supports Python 2.7 or 3.5
 * change default plugin for Eiger data to durin-plugin.so
 * migrate from pkg_resources to importlib.resources
+* require python 3.11 or later to match DIALS requirements
 
 1.6.2 (2020-03-14)
 ------------------
diff --git a/pyproject.toml b/pyproject.toml
index 906d715..65222d9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,13 +6,13 @@ authors = [
 ]
 description = "Fast DP: Fast Data Processsing with XDS"
 readme = "README.rst"
-requires-python = ">=3.9"
+requires-python = ">=3.11"
 license = { text = "Apache-2.0" }
 classifiers = [
     "Development Status :: 5 - Production/Stable",
-    "Programming Language :: Python :: 3.9",
-    "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Operating System :: POSIX :: Linux",
 ]