diff --git a/go.mod b/go.mod
index 8358c8c..de33912 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,5 @@
 module git.grassecon.net/urdt/ussd
 
 go 1.22.6
+
+require github.com/stretchr/testify v1.9.0 // indirect
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..f203383
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
+github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=