diff --git a/sdk_container/src/third_party/coreos-overlay/app-admin/mayday/mayday-1.0.0-r1.ebuild b/sdk_container/src/third_party/coreos-overlay/app-admin/mayday/mayday-1.0.0-r2.ebuild
similarity index 100%
rename from sdk_container/src/third_party/coreos-overlay/app-admin/mayday/mayday-1.0.0-r1.ebuild
rename to sdk_container/src/third_party/coreos-overlay/app-admin/mayday/mayday-1.0.0-r2.ebuild
diff --git a/sdk_container/src/third_party/coreos-overlay/app-admin/mayday/mayday-9999.ebuild b/sdk_container/src/third_party/coreos-overlay/app-admin/mayday/mayday-9999.ebuild
index 2e39ab5082..513f2c5b77 100644
--- a/sdk_container/src/third_party/coreos-overlay/app-admin/mayday/mayday-9999.ebuild
+++ b/sdk_container/src/third_party/coreos-overlay/app-admin/mayday/mayday-9999.ebuild
@@ -11,7 +11,7 @@ inherit coreos-go cros-workon
 if [[ "${PV}" == 9999 ]]; then
     KEYWORDS="~amd64 ~arm64"
 else
-    CROS_WORKON_COMMIT="a1fafd6bcaab8fd035a081afb4a47ba21c6864ee" # flatcar-master
+    CROS_WORKON_COMMIT="b2b1b3cb6beed130454b3fb04b45a020997a9edd" # flatcar-master
     KEYWORDS="amd64 arm64"
 fi
 
@@ -24,7 +24,7 @@ SLOT="0"
 IUSE=""
 
 src_compile() {
-	go_build "${COREOS_GO_PACKAGE}"
+	COREOS_GO_MOD=vendor go_build "${COREOS_GO_PACKAGE}"
 }
 
 src_install() {
diff --git a/sdk_container/src/third_party/coreos-overlay/metadata/md5-cache/app-admin/mayday-1.0.0-r1 b/sdk_container/src/third_party/coreos-overlay/metadata/md5-cache/app-admin/mayday-1.0.0-r2
similarity index 100%
rename from sdk_container/src/third_party/coreos-overlay/metadata/md5-cache/app-admin/mayday-1.0.0-r1
rename to sdk_container/src/third_party/coreos-overlay/metadata/md5-cache/app-admin/mayday-1.0.0-r2