diff --git a/.gitmodules b/.gitmodules
deleted file mode 100644
index e026cc5d93..0000000000
--- a/.gitmodules
+++ /dev/null
@@ -1,6 +0,0 @@
-[submodule "sdk_container/src/third_party/coreos-overlay"]
-	path = sdk_container/src/third_party/coreos-overlay
-	url = https://github.com/flatcar/coreos-overlay.git
-[submodule "sdk_container/src/third_party/portage-stable"]
-	path = sdk_container/src/third_party/portage-stable
-	url = https://github.com/flatcar/portage-stable.git
diff --git a/sdk_container/src/third_party/coreos-overlay b/sdk_container/src/third_party/coreos-overlay
deleted file mode 160000
index 492f4578e8..0000000000
--- a/sdk_container/src/third_party/coreos-overlay
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 492f4578e854d0106f28f369984441e40d349756
diff --git a/sdk_container/src/third_party/portage-stable b/sdk_container/src/third_party/portage-stable
deleted file mode 160000
index 5f175c2f16..0000000000
--- a/sdk_container/src/third_party/portage-stable
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 5f175c2f163a8a908fd7fbc863c5171661e11356