diff --git a/pkgs/servers/mobilizon/0001-fix-version.patch b/pkgs/servers/mobilizon/0001-fix-version.patch
new file mode 100644
index 0000000000000..da4d8f436a52e
--- /dev/null
+++ b/pkgs/servers/mobilizon/0001-fix-version.patch
@@ -0,0 +1,13 @@
+diff --git a/mix.exs b/mix.exs
+index 8338abf8..883e6987 100644
+--- a/mix.exs
++++ b/mix.exs
+@@ -1,7 +1,7 @@
+ defmodule Mobilizon.Mixfile do
+   use Mix.Project
+ 
+-  @version "5.1.0"
++  @version "5.1.1"
+ 
+   def project do
+     [
diff --git a/pkgs/servers/mobilizon/default.nix b/pkgs/servers/mobilizon/default.nix
index a007a30f6f260..efd40acbfeefb 100644
--- a/pkgs/servers/mobilizon/default.nix
+++ b/pkgs/servers/mobilizon/default.nix
@@ -19,6 +19,11 @@ in
 mixRelease rec {
   inherit (common) pname version src;
 
+  # Version 5.1.1 failed to bump their internal package version,
+  # which causes issues with static file serving in the NixOS module.
+  # See https://github.com/NixOS/nixpkgs/pull/370277
+  patches = [ ./0001-fix-version.patch ];
+
   nativeBuildInputs = [
     git
     cmake