diff --git a/go.mod b/go.mod
index 2da2faf..a527045 100644
--- a/go.mod
+++ b/go.mod
@@ -1,9 +1,10 @@
 module github.com/smallstep/certinfo
 
 go 1.21
+toolchain go1.22.3
 
 require (
-	github.com/google/certificate-transparency-go v1.1.8
+	github.com/google/certificate-transparency-go v1.2.1
 	github.com/google/go-cmp v0.6.0
 	golang.org/x/crypto v0.23.0
 )
diff --git a/go.sum b/go.sum
index 6d96e6b..0fb0488 100644
--- a/go.sum
+++ b/go.sum
@@ -1,7 +1,7 @@
 github.com/go-logr/logr v1.4.1 h1:pKouT5E8xu9zeFC39JXRDukb6JFQPXM5p5I91188VAQ=
 github.com/go-logr/logr v1.4.1/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
-github.com/google/certificate-transparency-go v1.1.8 h1:LGYKkgZF7satzgTak9R4yzfJXEeYVAjV6/EAEJOf1to=
-github.com/google/certificate-transparency-go v1.1.8/go.mod h1:bV/o8r0TBKRf1X//iiiSgWrvII4d7/8OiA+3vG26gI8=
+github.com/google/certificate-transparency-go v1.2.1 h1:4iW/NwzqOqYEEoCBEFP+jPbBXbLqMpq3CifMyOnDUME=
+github.com/google/certificate-transparency-go v1.2.1/go.mod h1:bvn/ytAccv+I6+DGkqpvSsEdiVGramgaSC6RD3tEmeE=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 golang.org/x/crypto v0.23.0 h1:dIJU/v2J8Mdglj/8rJ6UUOM3Zc9zLZxVZwwxMooUSAI=