diff --git a/go.mod b/go.mod
index 4adb9c6..89dec08 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@ module github.com/mattn/go-xmpp
 
 go 1.20
 
-require golang.org/x/crypto v0.15.0
+require golang.org/x/crypto v0.18.0
diff --git a/go.sum b/go.sum
index fcac726..4dda6b7 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-golang.org/x/crypto v0.15.0 h1:frVn1TEaCEaZcn3Tmd7Y2b5KKPaZ+I32Q2OA3kYp5TA=
-golang.org/x/crypto v0.15.0/go.mod h1:4ChreQoLWfG3xLDer1WdlH5NdlQ3+mwnQq1YTKY+72g=
+golang.org/x/crypto v0.18.0 h1:PGVlW0xEltQnzFZ55hkuX5+KLyrMYhHld1YHO4AKcdc=
+golang.org/x/crypto v0.18.0/go.mod h1:R0j02AL6hcrfOiy9T4ZYp/rcWeMxM3L6QYxlOuEG1mg=