diff --git a/.gitmodules b/.gitmodules
deleted file mode 100644
index f96fa36..0000000
--- a/.gitmodules
+++ /dev/null
@@ -1,3 +0,0 @@
-[submodule "antlrv4-grammars"]
-	path = antlrv4-grammars
-	url = https://github.com/antlr/grammars-v4
diff --git a/antlrv4-grammars b/antlrv4-grammars
deleted file mode 160000
index 8f5b7da..0000000
--- a/antlrv4-grammars
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 8f5b7da8fef79fba521d47339f4a4199941c59de