diff --git a/.gitmodules b/.gitmodules
index d21aaec..baaf2c0 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,3 +4,6 @@
 [submodule "packages/foundry/lib/openzeppelin-contracts"]
 	path = packages/foundry/lib/openzeppelin-contracts
 	url = https://github.com/OpenZeppelin/openzeppelin-contracts
+[submodule "packages/foundry/lib/solidity-bytes-utils"]
+	path = packages/foundry/lib/solidity-bytes-utils
+	url = https://github.com/gnsps/solidity-bytes-utils
diff --git a/packages/foundry/lib/solidity-bytes-utils b/packages/foundry/lib/solidity-bytes-utils
new file mode 160000
index 0000000..e0115c4
--- /dev/null
+++ b/packages/foundry/lib/solidity-bytes-utils
@@ -0,0 +1 @@
+Subproject commit e0115c4d231910df47ce3b60625ce562fe4af985