diff --git a/go.mod b/go.mod
index bba4a6b..15f1bf8 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,7 @@ require (
 	github.com/emersion/go-smtp v0.21.3
 	github.com/go-ozzo/ozzo-validation/v4 v4.3.0
 	github.com/kelseyhightower/envconfig v1.4.0
-	github.com/mailgun/mailgun-go/v4 v4.20.0
+	github.com/mailgun/mailgun-go/v4 v4.20.5
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.20.5
 	github.com/sirupsen/logrus v1.9.3
diff --git a/go.sum b/go.sum
index 6365bdb..0c57243 100644
--- a/go.sum
+++ b/go.sum
@@ -33,8 +33,8 @@ github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
 github.com/mailgun/errors v0.4.0 h1:6LFBvod6VIW83CMIOT9sYNp28TCX0NejFPP4dSX++i8=
 github.com/mailgun/errors v0.4.0/go.mod h1:xGBaaKdEdQT0/FhwvoXv4oBaqqmVZz9P1XEnvD/onc0=
-github.com/mailgun/mailgun-go/v4 v4.20.0 h1:vEFKT082sKfmrKPdmY2fWbYIhSL64vwY7l6g83RIUHU=
-github.com/mailgun/mailgun-go/v4 v4.20.0/go.mod h1:768NjUvsxW8Ga8fHIPITmr5f/U8qmnQqnZ3/cs3StUc=
+github.com/mailgun/mailgun-go/v4 v4.20.5 h1:X0n0faLwHy8iQmCVrzOmJAwsAEGjvtcCu38patBUfbc=
+github.com/mailgun/mailgun-go/v4 v4.20.5/go.mod h1:768NjUvsxW8Ga8fHIPITmr5f/U8qmnQqnZ3/cs3StUc=
 github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=