diff --git a/.github/workflows/bench.yml b/.github/workflows/bench.yml
index af9700018..57f926a29 100644
--- a/.github/workflows/bench.yml
+++ b/.github/workflows/bench.yml
@@ -17,10 +17,10 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v3
         with:
-          python-version: "3.11"
+          python-version: "3.12"
 
       - name: Install dependencies
-        run: pip install "numpy>=1.21,<2.0.0"
+        run: pip install "numpy>=1.23,<2.0.0"
 
       - name: Install bench dependencies
         run: pip install .[bench]
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fcf08696e..3a199e546 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,15 +7,15 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.9, "3.10", "3.11"]
-        numpy: [null, "numpy>=1.21,<2.0.0"]
+        python-version: ["3.10", "3.11"]
+        numpy: [null, "numpy>=1.23,<2.0.0"]
         uncertainties: [null, "uncertainties==3.1.6", "uncertainties>=3.1.6,<4.0.0"]
         extras: [null]
         include:
-          - python-version: 3.9 # Minimal versions
+          - python-version: 3.10 # Minimal versions
             numpy: "numpy"
             extras: matplotlib==2.2.5
-          - python-version: 3.9
+          - python-version: 3.10
             numpy: "numpy"
             uncertainties: "uncertainties"
             extras: "sparse xarray netCDF4 dask[complete]==2023.4.0 graphviz babel==2.8 mip>=1.13"
@@ -100,8 +100,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.9, "3.10", "3.11"]
-        numpy: [ "numpy>=1.21,<2.0.0" ]
+        python-version: ["3.10", "3.11"]
+        numpy: [ "numpy>=1.23,<2.0.0" ]
     runs-on: windows-latest
 
     env:
@@ -161,8 +161,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.9, "3.10", "3.11"]
-        numpy: [null, "numpy>=1.21,<2.0.0" ]
+        python-version: ["3.10", "3.11"]
+        numpy: [null, "numpy>=1.23,<2.0.0" ]
     runs-on: macos-latest
 
     env:
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 5f17aba71..c966ac3c3 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -17,7 +17,7 @@ jobs:
       - name: Set up minimal Python version
         uses: actions/setup-python@v2
         with:
-          python-version: 3.9
+          python-version: 3.10
 
       - name: Get pip cache dir
         id: pip-cache