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 5c6954eccf..0000000000
--- a/sdk_container/src/third_party/coreos-overlay
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 5c6954eccff2c5eadeeb248627997efd2e5de581
diff --git a/sdk_container/src/third_party/portage-stable b/sdk_container/src/third_party/portage-stable
deleted file mode 160000
index 18c70d9a24..0000000000
--- a/sdk_container/src/third_party/portage-stable
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 18c70d9a241b015369fa0fe7fd1a611fc9e1d117