diff --git a/.gitmodules b/.gitmodules
index 6650852..8764e09 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -13,3 +13,6 @@
 [submodule "onchain/lib/openzeppelin-contracts"]
 	path = onchain/lib/openzeppelin-contracts
 	url = https://github.com/openzeppelin/openzeppelin-contracts
+[submodule "onchain/lib/abdk-libraries-solidity"]
+	path = onchain/lib/abdk-libraries-solidity
+	url = https://github.com/abdk-consulting/abdk-libraries-solidity
diff --git a/onchain/lib/abdk-libraries-solidity b/onchain/lib/abdk-libraries-solidity
new file mode 160000
index 0000000..5e1e7c1
--- /dev/null
+++ b/onchain/lib/abdk-libraries-solidity
@@ -0,0 +1 @@
+Subproject commit 5e1e7c11b35f8313d3f7ce11c1b86320d7c0b554