diff --git a/.gitmodules b/.gitmodules
index 8b795c1d56..e69de29bb2 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,9 +0,0 @@
-[submodule "source/MaterialXView/NanoGUI"]
-	path = source/MaterialXView/NanoGUI
-	url = https://github.com/mitsuba-renderer/nanogui
-[submodule "source/MaterialXGraphEditor/External/ImGui"]
-	path = source/MaterialXGraphEditor/External/ImGui
-	url = https://github.com/ocornut/imgui
-[submodule "source/MaterialXGraphEditor/External/ImGuiNodeEditor"]
-	path = source/MaterialXGraphEditor/External/ImGuiNodeEditor
-	url = https://github.com/thedmd/imgui-node-editor
diff --git a/source/MaterialXGraphEditor/External/ImGui b/source/MaterialXGraphEditor/External/ImGui
deleted file mode 160000
index 9aae45eb4a..0000000000
--- a/source/MaterialXGraphEditor/External/ImGui
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 9aae45eb4a05a5a1f96be1ef37eb503a12ceb889
diff --git a/source/MaterialXGraphEditor/External/ImGuiNodeEditor b/source/MaterialXGraphEditor/External/ImGuiNodeEditor
deleted file mode 160000
index 2f99b2d613..0000000000
--- a/source/MaterialXGraphEditor/External/ImGuiNodeEditor
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 2f99b2d613a400f6579762bd7e7c343a0d844158
diff --git a/source/MaterialXView/NanoGUI b/source/MaterialXView/NanoGUI
deleted file mode 160000
index f5020e2f3e..0000000000
--- a/source/MaterialXView/NanoGUI
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit f5020e2f3e5114d517642e67afbb21cb88cf04c0