diff --git a/devshell/default.nix b/devshell/default.nix
index 66ba449..a4f54a7 100644
--- a/devshell/default.nix
+++ b/devshell/default.nix
@@ -12,6 +12,8 @@ in
     NIX_USER_CONF_FILES = toString (pkgs.writeText "nix.conf"
       ''
         experimental-features = nix-command flakes ca-derivations repl-flake
+        connect-timeout = 5
+        fallback = true
         ${lib.my.c.nix.cache.conf}
       '');
 
diff --git a/home-manager/modules/common.nix b/home-manager/modules/common.nix
index 049d01e..72b14f4 100644
--- a/home-manager/modules/common.nix
+++ b/home-manager/modules/common.nix
@@ -238,6 +238,8 @@ in
         settings = with lib.my.c.nix; {
           extra-substituters = cache.substituters;
           extra-trusted-public-keys = cache.keys;
+          connect-timeout = 5;
+          fallback = true;
         };
       };
     })
diff --git a/nixos/modules/common.nix b/nixos/modules/common.nix
index e5230d7..339900b 100644
--- a/nixos/modules/common.nix
+++ b/nixos/modules/common.nix
@@ -46,6 +46,8 @@ in
           experimental-features = [ "nix-command" "flakes" "ca-derivations" ];
           extra-substituters = cache.substituters;
           extra-trusted-public-keys = cache.keys;
+          connect-timeout = 5;
+          fallback = true;
         };
         registry = {
           pkgs = {