diff --git a/go.mod b/go.mod
index 7b97c16..e590e14 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@ module github.com/andygeiss/esp32-controller
 
 go 1.18
 
-require github.com/andygeiss/utils v0.4.0
+require github.com/andygeiss/utils v0.9.1
diff --git a/go.sum b/go.sum
index 32de402..f789d71 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-github.com/andygeiss/utils v0.3.0 h1:4JMekWbOL+oJ+SGIs9gZ1bD83W3NZjMO8jw9f8WhbpQ=
-github.com/andygeiss/utils v0.3.0/go.mod h1:6GobpffB2ogOr4AmqQZhYFyNkvWlSVKzWTN1wIDvUTc=
+github.com/andygeiss/utils v0.9.1 h1:PFFgmdwNDO2/bHA/4F7/fozifH+lPyuMBAhsBuTLGf8=
+github.com/andygeiss/utils v0.9.1/go.mod h1:Jatj6UsFNUMgf+9vPeMZ9il72nARlhMvc54r7AiPPiU=