diff --git a/go.mod b/go.mod
index d10326e..0a8458e 100644
--- a/go.mod
+++ b/go.mod
@@ -2,6 +2,4 @@ module github.com/transparency-dev/merkle
 
 go 1.17
 
-require github.com/google/go-cmp v0.5.6
-
-require golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 // indirect
+require github.com/google/go-cmp v0.5.9
diff --git a/go.sum b/go.sum
index 03e1a9c..62841cd 100644
--- a/go.sum
+++ b/go.sum
@@ -1,4 +1,2 @@
-github.com/google/go-cmp v0.5.6 h1:BKbKCqvP6I+rmFHt06ZmyQtvB8xAkWdhFyr0ZUNZcxQ=
-github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
+github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=