diff --git a/justfile b/justfile
index a976934..dd6fbe0 100644
--- a/justfile
+++ b/justfile
@@ -17,7 +17,7 @@ export CUSTOM_TAR := "build" / BASE_IMAGE + "." + PROFILE + ".tar"
 export CUSTOMIZATION_PROFILE := "profiles" / PROFILE + ".toml"
 export VARIANT := "pi45"
 export IMAGE_CONFIG := "images/" + VARIANT + ".toml"
-export VERSION := env_var_or_default("VERSION", `date +'%Y%m%d%H%M'`)
+export VERSION := env_var_or_default("VERSION", `date +'%Y%m%d.%H%M'`)
 export IMAGE_NAME := PREFIX + PROFILE + "_" + VARIANT + "_" + VERSION
 export OUTPUT_IMAGE := "build" / IMAGE_NAME + ".img"
 export BUILD_INFO := file_stem(IMAGE_NAME)