diff --git a/lesson15/01-simple-pub-sub/go.mod b/lesson15/01-simple-pub-sub/go.mod
index 6fe1bc2..8564755 100644
--- a/lesson15/01-simple-pub-sub/go.mod
+++ b/lesson15/01-simple-pub-sub/go.mod
@@ -1,12 +1,13 @@
 module pub-sub
 
-go 1.22.1
+go 1.24.0
+
+require github.com/nats-io/nats.go v1.39.1
 
 require (
 	github.com/klauspost/compress v1.17.9 // indirect
-	github.com/nats-io/nats.go v1.39.1 // indirect
 	github.com/nats-io/nkeys v0.4.9 // indirect
 	github.com/nats-io/nuid v1.0.1 // indirect
-	golang.org/x/crypto v0.31.0 // indirect
-	golang.org/x/sys v0.28.0 // indirect
+	golang.org/x/crypto v0.45.0 // indirect
+	golang.org/x/sys v0.38.0 // indirect
 )
diff --git a/lesson15/01-simple-pub-sub/go.sum b/lesson15/01-simple-pub-sub/go.sum
index d9dd868..f1a7883 100644
--- a/lesson15/01-simple-pub-sub/go.sum
+++ b/lesson15/01-simple-pub-sub/go.sum
@@ -6,7 +6,7 @@ github.com/nats-io/nkeys v0.4.9 h1:qe9Faq2Gxwi6RZnZMXfmGMZkg3afLLOtrU+gDZJ35b0=
 github.com/nats-io/nkeys v0.4.9/go.mod h1:jcMqs+FLG+W5YO36OX6wFIFcmpdAns+w1Wm6D3I/evE=
 github.com/nats-io/nuid v1.0.1 h1:5iA8DT8V7q8WK2EScv2padNa/rTESc1KdnPw4TC2paw=
 github.com/nats-io/nuid v1.0.1/go.mod h1:19wcPz3Ph3q0Jbyiqsd0kePYG7A95tJPxeL+1OSON2c=
-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/sys v0.28.0 h1:Fksou7UEQUWlKvIdsqzJmUmCX3cZuD2+P3XyyzwMhlA=
-golang.org/x/sys v0.28.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/crypto v0.45.0 h1:jMBrvKuj23MTlT0bQEOBcAE0mjg8mK9RXFhRH6nyF3Q=
+golang.org/x/crypto v0.45.0/go.mod h1:XTGrrkGJve7CYK7J8PEww4aY7gM3qMCElcJQ8n8JdX4=
+golang.org/x/sys v0.38.0 h1:3yZWxaJjBmCWXqhN1qh02AkOnCQ1poK6oF+a7xWL6Gc=
+golang.org/x/sys v0.38.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=