diff --git a/go.mod b/go.mod
index 0abd845..716c495 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module fortio.org/slack-proxy
 go 1.21
 
 require (
-	fortio.org/assert v1.2.0
+	fortio.org/assert v1.2.1
 	fortio.org/fortio v1.63.4
 	fortio.org/log v1.12.0
 	fortio.org/scli v1.14.1
diff --git a/go.sum b/go.sum
index 0d1d37f..fad22e1 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,5 @@
-fortio.org/assert v1.2.0 h1:XscfvR8yp4xW7OMCvNbCsieRFDxlwdEcb69+JZRp6LA=
-fortio.org/assert v1.2.0/go.mod h1:039mG+/iYDPO8Ibx8TrNuJCm2T2SuhwRI3uL9nHTTls=
+fortio.org/assert v1.2.1 h1:48I39urpeDj65RP1KguF7akCjILNeu6vICiYMEysR7Q=
+fortio.org/assert v1.2.1/go.mod h1:039mG+/iYDPO8Ibx8TrNuJCm2T2SuhwRI3uL9nHTTls=
 fortio.org/cli v1.5.1 h1:lqPvkxRVSajsVwLfblaN62BPAICPp05Oab+yjRvI3DU=
 fortio.org/cli v1.5.1/go.mod h1:Tp7AypudP1mJomTUN/J/vlOTlZDWTMsok09MMyA99ow=
 fortio.org/dflag v1.7.0 h1:4Vpo5hMly0rx9VMuyBaDGFK1Mx2S3qjxx1iAIA3KBgU=