diff --git a/Dockerfile b/Dockerfile
index c0f598e..fe1c6ab 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-ARG RUNTIME_VERSION="3.9"
+ARG RUNTIME_VERSION="3.8"
 ARG DISTRO_VERSION="3.15"
 ARG PULUMI_VERSION="3.29.1"