diff --git a/.gitmodules b/.gitmodules
index e124719..caa0ab1 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "lib/ds-test"]
 	path = lib/ds-test
 	url = https://github.com/dapphub/ds-test
+[submodule "lib/openzeppelin-contracts"]
+	path = lib/openzeppelin-contracts
+	url = https://github.com/OpenZeppelin/openzeppelin-contracts
diff --git a/lib/openzeppelin-contracts b/lib/openzeppelin-contracts
new file mode 160000
index 0000000..6618f9f
--- /dev/null
+++ b/lib/openzeppelin-contracts
@@ -0,0 +1 @@
+Subproject commit 6618f9f18424ade44116d0221719f4c93be6a078