diff --git a/pkgs/development/tools/slimerjs/default.nix b/pkgs/development/tools/slimerjs/default.nix
index c155cd30944..696a83e9d45 100644
--- a/pkgs/development/tools/slimerjs/default.nix
+++ b/pkgs/development/tools/slimerjs/default.nix
@@ -34,6 +34,7 @@ stdenv.mkDerivation {
     echo 'export SLIMERJSLAUNCHER=${xulrunner}/bin/xulrunner' >>  "$out/bin/slimerjs"
     echo "'$out/lib/slimerjs/slimerjs' \"\$@\"" >> "$out/bin/slimerjs"
     chmod a+x "$out/bin/slimerjs"
+    sed -e 's@MaxVersion=32[.]@MaxVersion=33.@' -i "$out/lib/slimerjs/application.ini"
   '';
   meta = {
     inherit (s) version;