diff --git a/pkgs/servers/monitoring/prometheus/prom2json.nix b/pkgs/servers/monitoring/prometheus/prom2json.nix
index a011dbb68b7e..7b6b0e473907 100644
--- a/pkgs/servers/monitoring/prometheus/prom2json.nix
+++ b/pkgs/servers/monitoring/prometheus/prom2json.nix
@@ -2,16 +2,16 @@
 
 buildGoModule rec {
   pname = "prom2json";
-  version = "1.3.3";
+  version = "1.4.0";
 
   src = fetchFromGitHub {
     rev = "v${version}";
     owner = "prometheus";
     repo = "prom2json";
-    sha256 = "sha256-VwJv2Y+YrlhLRx0lRPtHTzjvSz7GPfADCZibkQU6S1Y=";
+    sha256 = "sha256-oOnrIGtNQqS/7XCKcFtzXskv7N6syNyS52pZMwrY5wU=";
   };
 
-  vendorHash = "sha256-m9f3tCX21CMdcXcUcLFOxgs9oDR2Uaj5u22eJPDmpeE=";
+  vendorHash = "sha256-d+/38wUMFChuLlVb84DELRQylCDIqopzk2bw/yd5B/E=";
 
   meta = with lib; {
     description = "Tool to scrape a Prometheus client and dump the result as JSON";