diff --git a/.woodpecker.yml b/.woodpecker.yml
index 4b861c9..380f739 100644
--- a/.woodpecker.yml
+++ b/.woodpecker.yml
@@ -5,7 +5,7 @@ variables:
     - ORGANIZATION=containers
     - SOURCE_ORGANIZATION=mirrors
     - REPO=matrix-service-synapse   
-    - BUILD_ARGS=PYTHON_VERSION=3.10
+    - BUILD_ARGS=PYTHON_VERSION=3.9
     - DOCKERFILE=docker/Dockerfile
     - CONTEXT=.
     - WATCHTOWER_HOST=watchtower.balsillie.net