diff --git a/pkgs/servers/monitoring/prometheus/knot-exporter.nix b/pkgs/servers/monitoring/prometheus/knot-exporter.nix
index 42b6047d3d4f..bb9aaf587972 100644
--- a/pkgs/servers/monitoring/prometheus/knot-exporter.nix
+++ b/pkgs/servers/monitoring/prometheus/knot-exporter.nix
@@ -1,25 +1,16 @@
-{ stdenv, fetchFromGitHub, lib, python3, nixosTests, fetchpatch }:
+{ stdenv, fetchFromGitHub, lib, python3, nixosTests }:
 
 stdenv.mkDerivation rec {
   pname = "knot-exporter";
-  version = "unstable-2020-01-30";
+  version = "unstable-2021-08-21";
 
   src = fetchFromGitHub {
     owner = "ghedo";
     repo = "knot_exporter";
-    rev = "21dd46b401e0c1aea0b173e19462cdf89e1f444e";
-    sha256 = "sha256-4au4lpaq3jcqC2JXdCcf8h+YN8Nmm4eE0kZwA+1rWlc=";
+    rev = "b18eb7db735b50280f0815497475f4c7092a6550";
+    sha256 = "sha256-FGzkO/KHDhkM3PA2urNQcrMi3MHADkd0YwAvu1jvfrU=";
   };
 
-  patches = [
-    # Fixes a crash with all metrics enabled. See
-    # https://github.com/ghedo/knot_exporter/pull/6 for further context.
-    (fetchpatch {
-      url = "https://github.com/ghedo/knot_exporter/commit/2317476e080369450ae51a707ccd30d4b89d680f.patch";
-      sha256 = "sha256-yEPu8EE1V/draNx9DeMrPj+bMfJRxauweo33dITl4AA=";
-    })
-  ];
-
   dontBuild = true;
 
   nativeBuildInputs = [ python3.pkgs.wrapPython ];