diff --git a/go.mod b/go.mod
index 4a1902d..26d9f9e 100644
--- a/go.mod
+++ b/go.mod
@@ -1,13 +1,15 @@
 module github.com/github/smimesign
 
-go 1.22.7
+go 1.23.0
+
+toolchain go1.24.2
 
 require (
 	github.com/certifi/gocertifi v0.0.0-20180118203423-deb3ae2ef261
 	github.com/pborman/getopt v0.0.0-20180811024354-2b5b3bfb099b
 	github.com/pkg/errors v0.8.1
 	github.com/stretchr/testify v1.3.0
-	golang.org/x/crypto v0.31.0
+	golang.org/x/crypto v0.35.0
 	golang.org/x/xerrors v0.0.0-20240903120638-7835f813f4da
 )
 
diff --git a/go.sum b/go.sum
index 32cfd7a..fbbf371 100644
--- a/go.sum
+++ b/go.sum
@@ -12,7 +12,7 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
-golang.org/x/crypto v0.31.0 h1:ihbySMvVjLAeSH1IbfcRTkD/iNscyz8rGzjF/E5hV6U=
-golang.org/x/crypto v0.31.0/go.mod h1:kDsLvtWBEx7MV9tJOj9bnXsPbxwJQ6csT/x4KIN4Ssk=
+golang.org/x/crypto v0.35.0 h1:b15kiHdrGCHrP6LvwaQ3c03kgNhhiMgvlhxHQhmg2Xs=
+golang.org/x/crypto v0.35.0/go.mod h1:dy7dXNW32cAb/6/PRuTNsix8T+vJAqvuIy5Bli/x0YQ=
 golang.org/x/xerrors v0.0.0-20240903120638-7835f813f4da h1:noIWHXmPHxILtqtCOPIhSt0ABwskkZKjD3bXGnZGpNY=
 golang.org/x/xerrors v0.0.0-20240903120638-7835f813f4da/go.mod h1:NDW/Ps6MPRej6fsCIbMTohpP40sJ/P/vI1MoTEGwX90=