diff --git a/go.mod b/go.mod
index d3e7e5a..ba53576 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/google/go-attestation
 go 1.12
 
 require (
-	github.com/google/certificate-transparency-go v1.0.21
+	github.com/google/certificate-transparency-go v1.0.22-0.20190403155334-84853901c6b8
 	github.com/google/go-tpm v0.1.1
 	github.com/google/go-tpm-tools v0.0.0-20190328013357-5d2fd7f4b3e5
 	github.com/google/go-tspi v0.2.0
diff --git a/go.sum b/go.sum
index db0a534..2d4e1d4 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,7 @@
 github.com/google/certificate-transparency-go v1.0.21 h1:Yf1aXowfZ2nuboBsg7iYGLmwsOARdV86pfH3g95wXmE=
 github.com/google/certificate-transparency-go v1.0.21/go.mod h1:QeJfpSbVSfYc7RgB3gJFj9cbuQMMchQxrWXz8Ruopmg=
+github.com/google/certificate-transparency-go v1.0.22-0.20190403155334-84853901c6b8 h1:pZtGL2P6rU7wOnemTcvTgoH9s+QB646LB5dBcZ1w5yE=
+github.com/google/certificate-transparency-go v1.0.22-0.20190403155334-84853901c6b8/go.mod h1:QeJfpSbVSfYc7RgB3gJFj9cbuQMMchQxrWXz8Ruopmg=
 github.com/google/go-tpm v0.1.1 h1:Qwvy1ZQsQElHIb/7PCqE4OpiBwDRMMHpu2a2q16S2hI=
 github.com/google/go-tpm v0.1.1/go.mod h1:OGEdc1XfzTyNEQyahgeXVq+E0lMq3Vu/Y3bT9EfpRnE=
 github.com/google/go-tpm-tools v0.0.0-20190328013357-5d2fd7f4b3e5 h1:/moKuMi+BJ+OEva3jTms88ruyRkxaZn+f9EIZoGpQeY=