diff --git a/.readthedocs.yml b/.readthedocs.yml
index a9dde07..4b4bf5e 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -5,7 +5,8 @@ version: 2
 build:
   os: ubuntu-24.04
   tools:
-    python: "3.13"
+    # TODO update to 3.12 when available, tracked in #150
+    python: "3.12"
 
 formats: all
 
@@ -13,5 +14,6 @@ python:
   install:
     - path: .
       method: pip
+    - requirements: docs/requirements.txt
 
 ...
diff --git a/docs/requirements.txt b/docs/requirements.txt
new file mode 100644
index 0000000..a95ae18
--- /dev/null
+++ b/docs/requirements.txt
@@ -0,0 +1 @@
+furo
diff --git a/poetry.lock b/poetry.lock
index 98d071e..81177b3 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1220,5 +1220,5 @@ zstd = ["zstandard (>=0.18.0)"]
 
 [metadata]
 lock-version = "2.0"
-python-versions = "^3.13"
-content-hash = "9dd381612bcac54e07a514352164a57cc3bfc22d22f09bb4c6edf317b18b833d"
+python-versions = "^3.12"
+content-hash = "a478dddb5ac19d13361352b81eaa30d275a68536b96d946910ca6008f4683b08"
diff --git a/pyproject.toml b/pyproject.toml
index 472ca48..6ce462a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,7 +30,8 @@ deck-chores = "deck_chores.main:main"
 # the Dockerfile{-dev} have these values too
 # .readthedocs.yml must be in parity with the Python version
 # it's also all over the Github workflows
-python = "^3.13"
+# TODO update to 3.12 when available, tracked in #150
+python = "^3.12"
 apscheduler = "^3.6"
 cerberus = "^1.3.4"
 docker = {version = "^7", extras = ["ssh"]}