diff --git a/.github/actions/setup-project/action.yml b/.github/actions/setup-project/action.yml
index f9ca756b9..f653ba932 100644
--- a/.github/actions/setup-project/action.yml
+++ b/.github/actions/setup-project/action.yml
@@ -9,10 +9,10 @@ runs:
         sudo apt-get update \
         && sudo apt-get install -y --no-install-recommends \
         libcurl4-openssl-dev
-    - name: Set up Python 3.13.2
+    - name: Set up Python 3.12.2
       uses: actions/setup-python@v4
       with:
-        python-version: "3.13.2"
+        python-version: "3.12.2"
     - name: Install poetry
       shell: bash
       run: pip install poetry==2.1.3
diff --git a/README.md b/README.md
index 63fdc6b97..2a6902de6 100644
--- a/README.md
+++ b/README.md
@@ -259,12 +259,12 @@ git clone git@github.com:GSA/notifications-api.git
 
 Now go into the project directory (`notifications-api` by default), create a
 virtual environment, and set the local Python version to point to the virtual
-environment (assumes version Python `3.13.2` is what is installed on your
+environment (assumes version Python `3.12.2` is what is installed on your
 machine):
 
 ```sh
 cd notifications-api
-pyenv virtualenv 3.13.2 notify-api
+pyenv virtualenv 3.12.2 notify-api
 pyenv local notify-api
 ```
 
@@ -329,7 +329,7 @@ environment with the newer version of Python you just installed:
 
 ```sh
 cd notifications-api
-pyenv virtualenv 3.13.2 notify-api
+pyenv virtualenv 3.12.2 notify-api
 pyenv local notify-api
 ```
 
diff --git a/pyproject.toml b/pyproject.toml
index f026ced23..018954d96 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,7 +8,7 @@ readme = "README.md"
 
 
 [tool.poetry.dependencies]
-python = "^3.13.2"
+python = "^3.12.2"
 alembic = "==1.16.1"
 amqp = "==5.3.1"
 beautifulsoup4 = "==4.13.4"
diff --git a/runtime.txt b/runtime.txt
index c94f67640..64f28603a 100644
--- a/runtime.txt
+++ b/runtime.txt
@@ -1 +1 @@
-python-3.13.x
+python-3.12.x