diff --git a/pkgs/applications/networking/instant-messengers/slack/default.nix b/pkgs/applications/networking/instant-messengers/slack/default.nix
index 4de1d32a64a..54c652aab6a 100644
--- a/pkgs/applications/networking/instant-messengers/slack/default.nix
+++ b/pkgs/applications/networking/instant-messengers/slack/default.nix
@@ -41,11 +41,11 @@ let
 
   pname = "slack";
 
-  x86_64-darwin-version = "4.11.1";
-  x86_64-darwin-sha256 = "0a5rq8zhgdckwxnyjv6nrgpnj682j1rd9yc4nwvsbvpzv15kmd35";
+  x86_64-darwin-version = "4.12.2";
+  x86_64-darwin-sha256 = "0qflv2glfy7d77zjgqi7qcjr53c9dni26gmqkg9vk2xijmmd3xy7";
 
-  x86_64-linux-version = "4.11.1";
-  x86_64-linux-sha256 = "1r43g3xnla5aq38l3mpba8jb1gx9m2b6pr84prsclz27nr0rfm6g";
+  x86_64-linux-version = "4.12.2";
+  x86_64-linux-sha256 = "sha256-G5uQI078N7AbhEJs6a/17Hoi5DSdwvYLM1T/ttrEw4s=";
 
   version = {
     x86_64-darwin = x86_64-darwin-version;