diff --git a/go.mod b/go.mod
index 49dbc9c..dee9d93 100644
--- a/go.mod
+++ b/go.mod
@@ -3,11 +3,11 @@ module git.tcp.direct/kayos/common
 go 1.19
 
 require (
-	golang.org/x/crypto v0.20.0
+	golang.org/x/crypto v0.21.0
 	nullprogram.com/x/rng v1.1.0
 )
 
-require golang.org/x/sys v0.17.0 // indirect
+require golang.org/x/sys v0.18.0 // indirect
 
 retract (
 	v0.9.1 // premature (race condition)
diff --git a/go.sum b/go.sum
index 660937f..8e2e8a5 100644
--- a/go.sum
+++ b/go.sum
@@ -1,6 +1,6 @@
-golang.org/x/crypto v0.20.0 h1:jmAMJJZXr5KiCw05dfYK9QnqaqKLYXijU23lsEdcQqg=
-golang.org/x/crypto v0.20.0/go.mod h1:Xwo95rrVNIoSMx9wa1JroENMToLWn3RNVrTBpLHgZPQ=
-golang.org/x/sys v0.17.0 h1:25cE3gD+tdBA7lp7QfhuV+rJiE9YXTcS3VG1SqssI/Y=
-golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/crypto v0.21.0 h1:X31++rzVUdKhX5sWmSOFZxx8UW/ldWx55cbf08iNAMA=
+golang.org/x/crypto v0.21.0/go.mod h1:0BP7YvVV9gBbVKyeTG0Gyn+gZm94bibOW5BjDEYAOMs=
+golang.org/x/sys v0.18.0 h1:DBdB3niSjOA/O0blCZBqDefyWNYveAYMNF1Wum0DYQ4=
+golang.org/x/sys v0.18.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 nullprogram.com/x/rng v1.1.0 h1:SMU7DHaQSWtKJNTpNFIFt8Wd/KSmOuSDPXrMFp/UMro=
 nullprogram.com/x/rng v1.1.0/go.mod h1:glGw6V87vyfawxCzqOABL3WfL95G65az9Z2JZCylCkg=