diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index c286ceba..d065e0df 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.12", "3.13", "3.14"]
+        python-version: ["3.12", "3.13", "3.14", "3.15"]
         # macos-15-large is an intel runner, macos-14 is an arm64 runner
         platform: [ubuntu-latest, ubuntu-22.04-arm, windows-latest, macos-15-large, macos-14]
 
@@ -31,6 +31,7 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
+          allow-prereleases: true
           cache: 'pip'
 
       - name: Install numcodecs
@@ -83,6 +84,7 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
+          allow-prereleases: true
           cache: 'pip'
 
       - name: Install numcodecs
@@ -133,6 +135,7 @@ jobs:
         uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
+          allow-prereleases: true
           cache: 'pip'
 
       - name: Install numcodecs and Zarr