diff --git a/go.mod b/go.mod
new file mode 100644
index 000000000..ac01b8c81
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module github.com/ledgerwatch/erigon-lib
+
+go 1.16
+
+require github.com/holiman/uint256 v1.2.0
diff --git a/go.sum b/go.sum
new file mode 100644
index 000000000..6252fa84f
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+github.com/holiman/uint256 v1.2.0 h1:gpSYcPLWGv4sG43I2mVLiDZCNDh/EpGjSk8tmtxitHM=
+github.com/holiman/uint256 v1.2.0/go.mod h1:y4ga/t+u+Xwd7CpDgZESaRcWy0I7XMlTMA25ApIH5Jw=