diff --git a/go.mod b/go.mod
index 7d6f00f..1671e6c 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/neaas/nescript
 go 1.19
 
 require (
-	github.com/antonmedv/expr v1.12.5
+	github.com/antonmedv/expr v1.12.6
 	golang.org/x/crypto v0.8.0
 )
 
diff --git a/go.sum b/go.sum
index 35bd36a..c2a30c4 100644
--- a/go.sum
+++ b/go.sum
@@ -2,8 +2,8 @@ github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 h1:UQHMgLO+TxOEl
 github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1/go.mod h1:xomTg63KZ2rFqZQzSB4Vz2SUXa1BpHTVz9L5PTmPC4E=
 github.com/Microsoft/go-winio v0.6.0 h1:slsWYD/zyx7lCXoZVlvQrj0hPTM1HI4+v1sIda2yDvg=
 github.com/Microsoft/go-winio v0.6.0/go.mod h1:cTAf44im0RAYeL23bpB+fzCyDH2MJiz2BO69KH/soAE=
-github.com/antonmedv/expr v1.12.5 h1:Fq4okale9swwL3OeLLs9WD9H6GbgBLJyN/NUHRv+n0E=
-github.com/antonmedv/expr v1.12.5/go.mod h1:FPC8iWArxls7axbVLsW+kpg1mz29A1b2M6jt+hZfDkU=
+github.com/antonmedv/expr v1.12.6 h1:qtgMHOFissxhePwokx0xB9eqS6PUy0SbhDRPD67PInA=
+github.com/antonmedv/expr v1.12.6/go.mod h1:FPC8iWArxls7axbVLsW+kpg1mz29A1b2M6jt+hZfDkU=
 github.com/creack/pty v1.1.11/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=