diff --git a/nix/servant-prometheus.nix b/nix/servant-prometheus.nix
index f264623836c5b781663a54e4070d7d7920a16d86..07ee24d0e5d971fb99aed1cfab63ef5db1194cd1 100644
--- a/nix/servant-prometheus.nix
+++ b/nix/servant-prometheus.nix
@@ -106,7 +106,7 @@ in { system, compiler, flags, pkgs, hsPkgs, pkgconfPkgs, ... }:
     } // {
     src = (pkgs.lib).mkDefault (pkgs.fetchgit {
       url = "https://github.com/PrivateStorageio/servant-prometheus.git";
-      rev = "71b0edc1f4d8fd940dda30e35108f4b50d07f985";
+      rev = "b9461cbf689b47506b2eee973136706092b74968";
       sha256 = "1gfslw670ri119bnq3szc8b08n504f8cnzs5cgk5qvfwvfmsr1xh";
       });
     }
\ No newline at end of file
diff --git a/stack.yaml b/stack.yaml
index 9b84dac8c3e725c953657b1f93745d4993985fd0..2798c9a51a38637650bbe93fb6e947c57b4f458b 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -42,7 +42,7 @@ extra-deps:
   - "stripe-haskell-2.5.0"
   - "stripe-http-client-2.5.0"
   - github: "PrivateStorageio/servant-prometheus"
-    commit: "71b0edc1f4d8fd940dda30e35108f4b50d07f985"
+    commit: "b9461cbf689b47506b2eee973136706092b74968"
 
 # Override default flag values for local packages and extra-deps
 # flags: {}