diff --git a/pkgs/servers/monitoring/prometheus/alertmanager.nix b/pkgs/servers/monitoring/prometheus/alertmanager.nix
index 516a537bb24..530c4305088 100644
--- a/pkgs/servers/monitoring/prometheus/alertmanager.nix
+++ b/pkgs/servers/monitoring/prometheus/alertmanager.nix
@@ -2,7 +2,7 @@
 
 buildGoPackage rec {
   name = "alertmanager-${version}";
-  version = "0.15.2";
+  version = "0.15.3";
   rev = "v${version}";
 
   goPackagePath = "github.com/prometheus/alertmanager";
@@ -11,7 +11,7 @@ buildGoPackage rec {
     inherit rev;
     owner = "prometheus";
     repo = "alertmanager";
-    sha256 = "1r4j22jnxayicz9hn0pwm77cgzzywr5haq0hwz6sx5j2xwjmnwm7";
+    sha256 = "037wwfadb9rp1592v8bkqcsy9ym4gbhkg3pz6a6fzirg65d29aia";
   };
 
   # Tests exist, but seem to clash with the firewall.