diff --git a/flake.lock b/flake.lock
index dace752322..206ff4bf46 100644
--- a/flake.lock
+++ b/flake.lock
@@ -24,11 +24,11 @@
         "rustOverlay": "rustOverlay"
       },
       "locked": {
-        "lastModified": 1623601923,
-        "narHash": "sha256-zQDRV3OMYKlewfp3k0ilmFNfcFDxBCCk0tbcde8HMYM=",
+        "lastModified": 1624129119,
+        "narHash": "sha256-Mq7SkCA35dEEbWWfO8by94/+sZbvWfv3P8ByxNCVmOg=",
         "owner": "yusdacra",
         "repo": "nix-cargo-integration",
-        "rev": "ab922adefdeb387ce105b1bde75f62ffb971cec4",
+        "rev": "4018999c0998137c34b81ff2ff032d719cd25096",
         "type": "github"
       },
       "original": {
@@ -39,11 +39,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1623176226,
-        "narHash": "sha256-54a9uvHlIlK3i0b36HfGMc4zqM0BpMOOiFYBxEhQFK8=",
+        "lastModified": 1623862044,
+        "narHash": "sha256-mY7nldu9Wl/Yb0qMPihZrWw0bRWXNsk6iyYztw/6F6Y=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "51bb9f3e9ab6161a3bf7746e20b955712cef618b",
+        "rev": "0747387223edf1aa5beaedf48983471315d95e16",
         "type": "github"
       },
       "original": {
@@ -62,11 +62,11 @@
     "rustOverlay": {
       "flake": false,
       "locked": {
-        "lastModified": 1623550815,
-        "narHash": "sha256-RumRrkE6OTJDndHV4qZNZv8kUGnzwRHZQSyzx29r6/g=",
+        "lastModified": 1624069337,
+        "narHash": "sha256-9mTcx7osE4biF2Hm/GU19s1T3+KvphWj4QaUcJh39lU=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "9824f142cbd7bc3e2a92eefbb79addfff8704cd3",
+        "rev": "67dc2a9543a7c24591e6cb102ad0121c3a704aab",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index e31ceb2257..8854e66204 100644
--- a/flake.nix
+++ b/flake.nix
@@ -26,7 +26,7 @@
             pkgs = common.pkgs;
             lib = common.lib;
 
-            gitLfsCheckFile = ./assets/voxygen/background/bg_main.png;
+            gitLfsCheckFile = ./assets/voxygen/background/bg_main.jpg;
             utils = import ./nix/utils.nix { inherit pkgs; };
 
             sourceInfo =
diff --git a/nix/utils.nix b/nix/utils.nix
index d6ce5b648f..dd47bc3c21 100644
--- a/nix/utils.nix
+++ b/nix/utils.nix
@@ -3,7 +3,7 @@
     let
       gitLfsCheckOutput =
         builtins.readFile (pkgs.runCommand "gitLfsCheck" { } ''
-          ([ "$(${pkgs.file}/bin/file --mime-type ${checkFile})" = "${checkFile}: image/png" ] && printf "0" || printf "1") > $out
+          ([ "$(${pkgs.file}/bin/file --mime-type ${checkFile})" = "${checkFile}: image/jpeg" ] && printf "0" || printf "1") > $out
         '');
     in
     if gitLfsCheckOutput == "0" then