diff --git a/modules/common.nix b/modules/common.nix
index 6d60bff..a0cda4a 100755
--- a/modules/common.nix
+++ b/modules/common.nix
@@ -4,8 +4,14 @@
 
   nix.settings = {
     experimental-features = [ "nix-command" "flakes" ];
-    substituters = [ "https://nixcache.shelvacu.com" ];
-    trusted-public-keys = [ "nixcache.shelvacu.com:73u5ZGBpPRoVZfgNJQKYYBt9K9Io/jPwgUfuOLsJbsM=" ];
+    substituters = [
+      "https://nixcache.shelvacu.com"
+      "https://fossar.cachix.org"
+    ];
+    trusted-public-keys = [
+      "nixcache.shelvacu.com:73u5ZGBpPRoVZfgNJQKYYBt9K9Io/jPwgUfuOLsJbsM="
+      "fossar.cachix.org-1:Zv6FuqIboeHPWQS7ysLCJ7UT7xExb4OE8c4LyGb5AsE="
+    ];
     trusted-users = [ "@wheel" ];
   };