diff --git a/go.mod b/go.mod
index 6e7b2f2..da27359 100644
--- a/go.mod
+++ b/go.mod
@@ -40,7 +40,7 @@ require (
 	github.com/golang/glog v1.1.2 // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/golang/snappy v0.0.4 // indirect
-	github.com/google/cel-go v0.18.1 // indirect
+	github.com/google/cel-go v0.17.1 // indirect
 	github.com/google/pprof v0.0.0-20230926050212-f7f687d19a98 // indirect
 	github.com/google/uuid v1.3.1 // indirect
 	github.com/huandu/xstrings v1.4.0 // indirect
diff --git a/go.sum b/go.sum
index 0047881..a63f682 100644
--- a/go.sum
+++ b/go.sum
@@ -112,8 +112,8 @@ github.com/golang/snappy v0.0.3/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEW
 github.com/golang/snappy v0.0.4 h1:yAGX7huGHXlcLOEtBnF4w7FQwA26wojNCwOYAEhLjQM=
 github.com/golang/snappy v0.0.4/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/google/btree v1.1.2 h1:xf4v41cLI2Z6FxbKm+8Bu+m8ifhj15JuZ9sa0jZCMUU=
-github.com/google/cel-go v0.18.1 h1:V/lAXKq4C3BYLDy/ARzMtpkEEYfHQpZzVyzy69nEUjs=
-github.com/google/cel-go v0.18.1/go.mod h1:PVAybmSnWkNMUZR/tEWFUiJ1Np4Hz0MHsZJcgC4zln4=
+github.com/google/cel-go v0.17.1 h1:s2151PDGy/eqpCI80/8dl4VL3xTkqI/YubXLXCFw0mw=
+github.com/google/cel-go v0.17.1/go.mod h1:HXZKzB0LXqer5lHHgfWAnlYwJaQBDKMjxjulNQzhwhY=
 github.com/google/certificate-transparency-go v1.1.6 h1:SW5K3sr7ptST/pIvNkSVWMiJqemRmkjJPPT0jzXdOOY=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=