diff --git a/pkgs/by-name/pr/prometheus-postfix-exporter/package.nix b/pkgs/by-name/pr/prometheus-postfix-exporter/package.nix
index cb70fb6958fe..4495b8c30878 100644
--- a/pkgs/by-name/pr/prometheus-postfix-exporter/package.nix
+++ b/pkgs/by-name/pr/prometheus-postfix-exporter/package.nix
@@ -10,16 +10,16 @@
 
 buildGoModule rec {
   pname = "postfix_exporter";
-  version = "0.20.0";
+  version = "0.20.4";
 
   src = fetchFromGitHub {
     owner = "Hsn723";
     repo = "postfix_exporter";
     tag = "v${version}";
-    sha256 = "sha256-tW86lnSLQdyZwvRiqTU1oExZ/zDIrZUraeoAOjs35yY=";
+    sha256 = "sha256-LCjTw5nL8xP6ODwVJxj4Zg99CiFvqbzjb931fmhtk0M=";
   };
 
-  vendorHash = "sha256-T8fTvrpBKm+wDqf+iBeBJh9H1HEebAf0lOnnuF0W5fI=";
+  vendorHash = "sha256-6lqUygsV1pPGKN9SOZIouPVSZWuSOlPhqFbm16HfzGk=";
 
   ldflags = [
     "-s"