diff --git a/go.mod b/go.mod
index 078abbc..9c062bc 100644
--- a/go.mod
+++ b/go.mod
@@ -2,14 +2,12 @@ module rfd59/go-linky
 
 go 1.24.5
 
-require github.com/stretchr/testify v1.11.0
+require github.com/stretchr/testify v1.12.0
 
 require (
 	github.com/creack/goselect v0.1.2 // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/eclipse/paho.mqtt.golang v1.5.0
 	github.com/gorilla/websocket v1.5.3 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/thejerf/slogassert v0.3.4
 	go.bug.st/serial v1.6.4
 	golang.org/x/net v0.27.0 // indirect
diff --git a/go.sum b/go.sum
index 6e6cab8..a127013 100644
--- a/go.sum
+++ b/go.sum
@@ -1,15 +1,11 @@
 github.com/creack/goselect v0.1.2 h1:2DNy14+JPjRBgPzAd1thbQp4BSIihxcBf0IXhQXDRa0=
 github.com/creack/goselect v0.1.2/go.mod h1:a/NhLweNvqIYMuxcMOuWY516Cimucms3DglDzQP3hKY=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/eclipse/paho.mqtt.golang v1.5.0 h1:EH+bUVJNgttidWFkLLVKaQPGmkTUfQQqjOsyvMGvD6o=
 github.com/eclipse/paho.mqtt.golang v1.5.0/go.mod h1:du/2qNQVqJf/Sqs4MEL77kR8QTqANF7XU7Fk0aOTAgk=
 github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
 github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/testify v1.11.0 h1:ib4sjIrwZKxE5u/Japgo/7SJV3PvgjGiRNAvTVGqQl8=
-github.com/stretchr/testify v1.11.0/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
+github.com/stretchr/testify v1.12.0 h1:K6Mr6jO9JICuend/5xzTM03ydSV3vdNRYAdPSukj8uI=
+github.com/stretchr/testify v1.12.0/go.mod h1:bOYBZb5qJ00vPzWfIqBUZPaxK8jWiXc6d3ErP4Ca9Gw=
 github.com/thejerf/slogassert v0.3.4 h1:VoTsXixRbXMrRSSxDjYTiEDCM4VWbsYPW5rB/hX24kM=
 github.com/thejerf/slogassert v0.3.4/go.mod h1:0zn9ISLVKo1aPMTqcGfG1o6dWwt+Rk574GlUxHD4rs8=
 go.bug.st/serial v1.6.4 h1:7FmqNPgVp3pu2Jz5PoPtbZ9jJO5gnEnZIvnI1lzve8A=