diff --git a/pkgs/tools/misc/ntfy/default.nix b/pkgs/tools/misc/ntfy/default.nix
index 4a2af4895ac4..e976ca5fd691 100644
--- a/pkgs/tools/misc/ntfy/default.nix
+++ b/pkgs/tools/misc/ntfy/default.nix
@@ -1,4 +1,4 @@
-{ lib, python3Packages, fetchFromGitHub }:
+{ lib, python3Packages, fetchFromGitHub, fetchpatch }:
 
 python3Packages.buildPythonApplication rec {
   pname = "ntfy";
@@ -23,6 +23,17 @@ python3Packages.buildPythonApplication rec {
     matrix-client
     dbus-python
     ntfy-webpush
+    slack-sdk
+  ];
+
+  patches = [
+    # Fix Slack integration no longer working.
+    # From https://github.com/dschep/ntfy/pull/229 - "Swap Slacker for Slack SDK"
+    (fetchpatch {
+      name = "ntfy-Swap-Slacker-for-Slack-SDK.patch";
+      url = "https://github.com/dschep/ntfy/commit/2346e7cfdca84c8f1afc7462a92145c1789deb3e.patch";
+      sha256 = "13k7jbsdx0jx7l5s8whirric76hml5bznkfcxab5xdp88q52kpk7";
+    })
   ];
 
   checkPhase = ''