Update flake inputs

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "emacs-overlay": {
       "locked": {
-        "lastModified": 1638873958,
-        "narHash": "sha256-mXixK5YP9EwMaVRxXNdnbL6VGTtBrLMPb0+41tfAfro=",
+        "lastModified": 1641612166,
+        "narHash": "sha256-Ofhvpd6LGj8rcRtiB2aCC0dqMKcipwRW/Lq7JYCGfgU=",
         "owner": "nix-community",
         "repo": "emacs-overlay",
-        "rev": "555de7d00eb7c8df21242fdad6f3a6f2201e7e14",
+        "rev": "f6c7cc2535d9a3b8526beafbc54a6b1747ac08ab",
         "type": "github"
       },
       "original": {
@@ -32,11 +32,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1638535497,
-        "narHash": "sha256-tk5LNbdkUhALp00+r5ZmQ3t7n2d5M7YUQB+MznWvVOg=",
+        "lastModified": 1641528457,
+        "narHash": "sha256-FyU9E63n1W7Ql4pMnhW2/rO9OftWZ37pLppn/c1aisY=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "c71f061c68ba8ce53471b767d5049cbd0f3d8490",
+        "rev": "ff377a78794d412a35245e05428c8f95fef3951f",
         "type": "github"
       },
       "original": {

nixos/dustbowl.nix

@@ -17,7 +17,7 @@
   nix = {
     package = pkgs.nixFlakes;
     extraOptions = ''
-      experimental-features = nix-command flakes ca-references
+      experimental-features = nix-command flakes
       builders-use-substitutes = true
     '';
     distributedBuilds = true;
@@ -25,7 +25,7 @@
   };
 
   # Kernel version
-  boot.kernelPackages = pkgs.linuxPackages_5_14;
+  boot.kernelPackages = pkgs.linuxPackages_5_15;
 
   # Use the systemd-boot EFI boot loader.
   boot.loader.systemd-boot.enable = true;