diff --git a/overlays/default.nix b/overlays/default.nix
index 37a7340..d285cb1 100644
--- a/overlays/default.nix
+++ b/overlays/default.nix
@@ -17,6 +17,7 @@
             element-themes = prev.callPackage ./pkgs/element-themes { inherit (inputs) element-themes; };
             forgejo = release-2311.forgejo;
           })
+          (import ./keycloak.nix)
         ];
       });
     };
diff --git a/overlays/keycloak.nix b/overlays/keycloak.nix
new file mode 100644
index 0000000..f45772e
--- /dev/null
+++ b/overlays/keycloak.nix
@@ -0,0 +1,9 @@
+final: prev: {
+  keycloak = prev.keycloak.overrideAttrs (oldAttrs: rec {
+    version = "999.0.0-SNAPSHOT";
+    src = prev.fetchzip {
+      url = "https://github.com/keycloak/keycloak/releases/download/nightly/keycloak-${version}.zip";
+      hash = "sha256-2rOhBmPXQy6HK3CtG/7E2EUK5zEWrJtSgBg6AMw2q3E=";
+    };
+  });
+}