diff --git a/pkgs/applications/networking/instant-messengers/slack/dark-theme.nix b/pkgs/applications/networking/instant-messengers/slack/dark-theme.nix
index 8fb92766efa..c24e2c4301e 100644
--- a/pkgs/applications/networking/instant-messengers/slack/dark-theme.nix
+++ b/pkgs/applications/networking/instant-messengers/slack/dark-theme.nix
@@ -2,7 +2,7 @@
 
 stdenv.mkDerivation rec {
   rev = "e2a6a9cd9da70175881ab991220c86aa87179509";
-  version = "2019-07-25";
+  version = "2019-07-26";
   name = "slack-theme-black-${version}";
 
   src = fetchgit { inherit rev;