diff --git a/.gitmodules b/.gitmodules
index 60b8392..c42982f 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,3 +7,6 @@
 [submodule "lib/account-abstraction"]
 	path = lib/account-abstraction
 	url = https://github.com/eth-infinitism/account-abstraction
+[submodule "lib/erc6551"]
+	path = lib/erc6551
+	url = https://github.com/erc6551/reference
diff --git a/lib/erc6551 b/lib/erc6551
new file mode 160000
index 0000000..43955c3
--- /dev/null
+++ b/lib/erc6551
@@ -0,0 +1 @@
+Subproject commit 43955c3c3ce0fe7239883992aef35822bb83d9c2