diff --git a/sdk_container/.repo/manifests/version.txt b/sdk_container/.repo/manifests/version.txt
index 6b52103532..1975c8b4d7 100644
--- a/sdk_container/.repo/manifests/version.txt
+++ b/sdk_container/.repo/manifests/version.txt
@@ -1,4 +1,4 @@
-FLATCAR_VERSION=4547.0.0
+FLATCAR_VERSION=4547.0.0+nightly-20251218-2100
 FLATCAR_VERSION_ID=4547.0.0
-FLATCAR_BUILD_ID=""
+FLATCAR_BUILD_ID="nightly-20251218-2100"
 FLATCAR_SDK_VERSION=4547.0.0