diff --git a/nixos/tests/prometheus-exporters.nix b/nixos/tests/prometheus-exporters.nix
index d86be7030cc2..3009afa26234 100644
--- a/nixos/tests/prometheus-exporters.nix
+++ b/nixos/tests/prometheus-exporters.nix
@@ -1291,7 +1291,7 @@ let
         wait_for_file("/var/lib/postfix/queue/public/showq")
         wait_for_open_port(9154)
         wait_until_succeeds(
-            "curl -sSf http://localhost:9154/metrics | grep 'postfix_up{path=\"/var/lib/postfix/queue/public/showq\"} 1'"
+            "curl -sSf http://localhost:9154/metrics | grep 'postfix_up{path=\"unix:///var/lib/postfix/queue/public/showq\"} 1'"
         )
         succeed(
             "curl -sSf http://localhost:9154/metrics | grep 'postfix_smtpd_connects_total 0'"
diff --git a/pkgs/servers/monitoring/prometheus/postfix-exporter.nix b/pkgs/servers/monitoring/prometheus/postfix-exporter.nix
index 4c69dac2ac79..172c6a19f96e 100644
--- a/pkgs/servers/monitoring/prometheus/postfix-exporter.nix
+++ b/pkgs/servers/monitoring/prometheus/postfix-exporter.nix
@@ -10,16 +10,16 @@
 
 buildGoModule rec {
   pname = "postfix_exporter";
-  version = "0.14.0";
+  version = "0.15.0";
 
   src = fetchFromGitHub {
     owner = "Hsn723";
     repo = "postfix_exporter";
     tag = "v${version}";
-    sha256 = "sha256-D6m0xWNkUMouubNjIaB/dHT1YIcDi/oJ6U+2lmKwBZM=";
+    sha256 = "sha256-0HgvkKdgfKcX74dJLOxSnp1xJuaOazusgDrCdhX/Lg4=";
   };
 
-  vendorHash = "sha256-kmZWQu26TBhEQo/SrPxhyeGo5yliCFUCTxIIkncCciw=";
+  vendorHash = "sha256-HsXVZ6fmaGU93CpA+t/VpIsEigkh09Uw8h7eSeaThk4=";
 
   ldflags = [
     "-s"