diff --git a/services/eap-noob/helpers.go b/services/eap-noob/helpers.go
index 5edf238a..2a8fda5b 100644
--- a/services/eap-noob/helpers.go
+++ b/services/eap-noob/helpers.go
@@ -12,15 +12,6 @@ import (
 
 func intp(i int) *int { return &i }
 
-func containsInt(s []int, v int) bool {
-	for _, x := range s {
-		if x == v {
-			return true
-		}
-	}
-	return false
-}
-
 // newPeerId generates a fresh, unguessable 16-byte identifier base64url-encoded
 // to a 22-character string (RFC 9140, Section 3.3.1).
 func newPeerId() (string, error) {
diff --git a/services/eap-noob/peer.go b/services/eap-noob/peer.go
index d1d5042b..0e463895 100644
--- a/services/eap-noob/peer.go
+++ b/services/eap-noob/peer.go
@@ -8,6 +8,7 @@ import (
 	"crypto/rand"
 	"encoding/json"
 	"fmt"
+	"slices"
 )
 
 // PeerConfig configures the EAP peer role.
@@ -406,7 +407,7 @@ func (p *Peer) fail(code int, info string) (Outcome, error) {
 func bestVersion(serverVers, peerVers []int) (int, bool) {
 	best, ok := 0, false
 	for _, v := range serverVers {
-		if containsInt(peerVers, v) && v >= best {
+		if slices.Contains(peerVers, v) && v >= best {
 			best, ok = v, true
 		}
 	}
@@ -415,7 +416,7 @@ func bestVersion(serverVers, peerVers []int) (int, bool) {
 
 func firstSupported(serverCS, peerCS []int) (int, bool) {
 	for _, c := range serverCS {
-		if containsInt(peerCS, c) && isSupportedCryptosuite(c) {
+		if slices.Contains(peerCS, c) && isSupportedCryptosuite(c) {
 			return c, true
 		}
 	}
diff --git a/services/eap-noob/server.go b/services/eap-noob/server.go
index cd95d35e..1a113e96 100644
--- a/services/eap-noob/server.go
+++ b/services/eap-noob/server.go
@@ -8,6 +8,7 @@ import (
 	"crypto/rand"
 	"encoding/json"
 	"fmt"
+	"slices"
 )
 
 // ServerConfig configures the EAP server role.
@@ -192,14 +193,14 @@ func (s *Server) onNegotiation(wm *wireMessage) (Outcome, error) {
 	if err != nil {
 		return s.fail(ErrInvalidData, "bad Verp")
 	}
-	if !containsInt(s.cfg.Versions, verp) {
+	if !slices.Contains(s.cfg.Versions, verp) {
 		return s.fail(ErrUnsupportedVersion, "peer selected unsupported version")
 	}
 	csp, err := rawToInt(wm.Cryptosuitep)
 	if err != nil {
 		return s.fail(ErrInvalidData, "bad Cryptosuitep")
 	}
-	if !containsInt(s.cfg.Cryptosuites, csp) || !isSupportedCryptosuite(csp) {
+	if !slices.Contains(s.cfg.Cryptosuites, csp) || !isSupportedCryptosuite(csp) {
 		return s.fail(ErrUnsupportedCryptosuite, "peer selected unsupported cryptosuite")
 	}
 	dirp, err := rawToInt(wm.Dirp)