diff --git a/go.mod b/go.mod
index cb3bd2b..1028f2a 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,8 @@ module github.com/skx/cpmulator
 go 1.22.2
 
 require (
-	github.com/koron-go/z80 v0.9.1 // indirect
-	golang.org/x/sys v0.19.0 // indirect
-	golang.org/x/term v0.19.0 // indirect
+	github.com/koron-go/z80 v0.9.1
+	golang.org/x/term v0.19.0
 )
+
+require golang.org/x/sys v0.19.0 // indirect
diff --git a/go.sum b/go.sum
index 4a476e5..59bfdec 100644
--- a/go.sum
+++ b/go.sum
@@ -1,3 +1,5 @@
+github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
+github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/koron-go/z80 v0.9.1 h1:gecMIZ4rkgMDdacxx2LEjcURuO2iqvJLM3BA5fomuZw=
 github.com/koron-go/z80 v0.9.1/go.mod h1:ry+Zl9kRKelzaDG9UzEtUpUnXy0Yv/kk1YEaX958xdk=
 golang.org/x/sys v0.19.0 h1:q5f1RH2jigJ1MoAWp2KTp3gm5zAGFUTarQZ5U386+4o=