diff --git a/go.mod b/go.mod
index 5b857b3..ba7b6fe 100644
--- a/go.mod
+++ b/go.mod
@@ -13,6 +13,7 @@ require (
 	github.com/hashicorp/vault/api v1.9.0
 	github.com/hashicorp/vault/sdk v0.9.0
 	github.com/jeffchao/backoff v0.0.0-20140404060208-9d7fd7aa17f2
+	github.com/patrickmn/go-cache v2.1.0+incompatible
 	github.com/satori/go.uuid v1.2.0
 	golang.org/x/oauth2 v0.4.0
 	google.golang.org/api v0.103.0
diff --git a/go.sum b/go.sum
index 05b5302..2932ceb 100644
--- a/go.sum
+++ b/go.sum
@@ -188,6 +188,8 @@ github.com/oklog/run v1.0.0 h1:Ru7dDtJNOyC66gQ5dQmaCa0qIsAUFY3sFpK1Xk8igrw=
 github.com/oklog/run v1.0.0/go.mod h1:dlhp/R75TPv97u0XWUtDeV/lRKWPKSdTuV0TZvrmrQA=
 github.com/pascaldekloe/goe v0.1.0 h1:cBOtyMzM9HTpWjXfbbunk26uA6nG3a8n06Wieeh0MwY=
 github.com/pascaldekloe/goe v0.1.0/go.mod h1:lzWF7FIEvWOWxwDKqyGYQf6ZUaNfKdP144TG7ZOy1lc=
+github.com/patrickmn/go-cache v2.1.0+incompatible h1:HRMgzkcYKYpi3C8ajMPV8OFXaaRUnok+kx1WdO15EQc=
+github.com/patrickmn/go-cache v2.1.0+incompatible/go.mod h1:3Qf8kWWT7OJRJbdiICTKqZju1ZixQ/KpMGzzAfe6+WQ=
 github.com/pierrec/lz4 v2.5.2+incompatible h1:WCjObylUIOlKy/+7Abdn34TLIkXiA4UWUMhxq9m9ZXI=
 github.com/pierrec/lz4 v2.5.2+incompatible/go.mod h1:pdkljMzZIN41W+lC3N2tnIh5sFi+IEE17M5jbnwPHcY=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=