diff --git a/.gitmodules b/.gitmodules
index 9369dcb..9ba55b8 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,3 +7,6 @@
 [submodule "lib/openzeppelin-contracts"]
 	path = lib/openzeppelin-contracts
 	url = https://github.com/openzeppelin/openzeppelin-contracts
+[submodule "lib/erc721a"]
+	path = lib/erc721a
+	url = https://github.com/chiru-labs/erc721a
diff --git a/lib/erc721a b/lib/erc721a
new file mode 160000
index 0000000..b3ca898
--- /dev/null
+++ b/lib/erc721a
@@ -0,0 +1 @@
+Subproject commit b3ca8989411f717fac2d6a21a1c59ef05188907f