diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9dcacf3..c1df1b4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,11 +15,11 @@ jobs:
       - uses: actions/checkout@v4
         with:
           submodules: true
-      - name: Set up Python 3.x
+      - name: Set up Python 3.12
         uses: actions/setup-python@v5
         with:
-          # Semantic version range syntax or exact version of a Python version
-          python-version: '3.x'
+          # TODO: Revert this to '3.x' once we have an updated version of `poseidon-hash` that works for Python >=3.13.
+          python-version: '3.12'
       - name: Install dependencies
         run: pip install -r requirements.txt
       - name: Build and install eth-specs