diff --git a/configuration.nix b/configuration.nix
index 632729d..7f273cb 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -100,6 +100,9 @@
   # Install firefox.
   programs.firefox.enable = true;
 
+  # chroot jail
+  programs.firejail.enable = true;
+
   # shell
   programs.zsh.enable = true;