diff --git a/.gitmodules b/.gitmodules
index 199a7186..43ff96da 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,6 +1,3 @@
-[submodule "external/img4tool"]
-	path = external/img4tool
-	url = https://github.com/tihmstar/img4tool.git
 [submodule "external/tsschecker"]
 	path = external/tsschecker
 	url = https://github.com/tihmstar/tsschecker.git
diff --git a/external/img4tool b/external/img4tool
deleted file mode 160000
index b46989ab..00000000
--- a/external/img4tool
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit b46989ab2a1adb2c29f0847b78366265344ece1e