diff --git a/go.mod b/go.mod
index 81b5575..4018462 100644
--- a/go.mod
+++ b/go.mod
@@ -4,7 +4,7 @@ go 1.26.6
 
 require (
 	github.com/eclipse/paho.golang v0.23.0
-	github.com/grid-x/modbus v0.0.0-20260701064235-82e41c9acfb6
+	github.com/grid-x/modbus v1.5.1
 	gopkg.in/ini.v1 v1.67.3
 )
 
diff --git a/go.sum b/go.sum
index 9b54abd..b57f6cc 100644
--- a/go.sum
+++ b/go.sum
@@ -7,8 +7,8 @@ github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 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/grid-x/modbus v0.0.0-20260701064235-82e41c9acfb6 h1:SU+JFCzk2CXTrFrYkB8X9vBUTYhdsXmUoXnSTOIInXk=
-github.com/grid-x/modbus v0.0.0-20260701064235-82e41c9acfb6/go.mod h1:WpbUAyptAAi0VAriSRopZa6uhiJOJCTz7KFvgGtNRXc=
+github.com/grid-x/modbus v1.5.1 h1:coQtnQBzbTPzLfoQqb0LpICA5Fy59d/bJnfsmFL7pOM=
+github.com/grid-x/modbus v1.5.1/go.mod h1:WpbUAyptAAi0VAriSRopZa6uhiJOJCTz7KFvgGtNRXc=
 github.com/grid-x/serial v0.0.0-20211107191517-583c7356b3aa h1:Rsn6ARgNkXrsXJIzhkE4vQr5Gbx2LvtEMv4BJOK4LyU=
 github.com/grid-x/serial v0.0.0-20211107191517-583c7356b3aa/go.mod h1:kdOd86/VGFWRrtkNwf1MPk0u1gIjc4Y7R2j7nhwc7Rk=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=