diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1498081..16e4a2a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
 
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.13"
+          python-version: "3.15"
 
       - name: Install tooling
         # ruff pinned to match pyproject.toml's dev dependency floor: an unpinned
diff --git a/.github/workflows/deploy_prez.yml b/.github/workflows/deploy_prez.yml
index f2613cc..836955a 100644
--- a/.github/workflows/deploy_prez.yml
+++ b/.github/workflows/deploy_prez.yml
@@ -25,7 +25,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: "3.11"
+          python-version: "3.15"
       
       - name: Install Python dependencies for Quarto
         run: |
diff --git a/.python-version b/.python-version
index 24ee5b1..93a848f 100644
--- a/.python-version
+++ b/.python-version
@@ -1 +1 @@
-3.13
+3.15