diff --git a/go.mod b/go.mod
index c463b7a..c16034a 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,6 @@
 module github.com/stefanalfbo/programmingbitcoin
 
 go 1.22.0
+toolchain go1.24.1
 
-require golang.org/x/crypto v0.31.0
+require golang.org/x/crypto v0.35.0
diff --git a/go.sum b/go.sum
index 9615005..3987ac8 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-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=