diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..cdb0ee5
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,8 @@
+module github.com/launchdarkly/go-ntlm-proxy-auth
+
+go 1.13
+
+require (
+	github.com/launchdarkly/go-ntlmssp v0.0.0-20190601005913-a22bdd33b2a4
+	golang.org/x/crypto v0.0.0-20200604202706-70a84ac30bf9 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..e2c63e9
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,9 @@
+github.com/launchdarkly/go-ntlmssp v0.0.0-20190601005913-a22bdd33b2a4 h1:r1FdPJK3SrnEKWrE8M1C57lxywsXTOdDTw8+cBaIhTI=
+github.com/launchdarkly/go-ntlmssp v0.0.0-20190601005913-a22bdd33b2a4/go.mod h1:rZQicBRNZBfM+eydZ8LNaQ0p9twUfP6T0hUzJFhaxM4=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20200604202706-70a84ac30bf9 h1:vEg9joUBmeBcK9iSJftGNf3coIG4HqZElCPehJsfAYM=
+golang.org/x/crypto v0.0.0-20200604202706-70a84ac30bf9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=