diff --git a/Cargo.lock b/Cargo.lock
index ee57881..2d7c6aa 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -34,9 +34,9 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "compiler_builtins"
-version = "0.1.39"
+version = "0.1.49"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3748f82c7d366a0b4950257d19db685d4958d2fa27c6d164a3f069fec42b748b"
+checksum = "20b1438ef42c655665a8ab2c1c6d605a305f031d38d9be689ddfef41a20f3aa2"
 
 [[package]]
 name = "core2"
diff --git a/flake.lock b/flake.lock
index e8df58a..52296a2 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1721548954,
-        "narHash": "sha256-7cCC8+Tdq1+3OPyc3+gVo9dzUNkNIQfwSDJ2HSi2u3o=",
+        "lastModified": 1722221733,
+        "narHash": "sha256-sga9SrrPb+pQJxG1ttJfMPheZvDOxApFfwXCFO0H9xw=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "63d37ccd2d178d54e7fb691d7ec76000740ea24a",
+        "rev": "12bf09802d77264e441f48e25459c10c93eada2e",
         "type": "github"
       },
       "original": {
@@ -29,11 +29,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1721701191,
-        "narHash": "sha256-nM4szL90VeZHZEC5rFfaiiPNTVOmsihdtk2QSP1l37I=",
+        "lastModified": 1722391647,
+        "narHash": "sha256-JTi7l1oxnatF1uX/gnGMlRnyFMtylRw4MqhCUdoN2K4=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "4674ff2c2e5423a0cebe16e61aa874c359306af4",
+        "rev": "0fd4a5d2098faa516a9b83022aec7db766cd1de8",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index dcc7542..d55fd39 100644
--- a/flake.nix
+++ b/flake.nix
@@ -128,7 +128,13 @@
         src = builtins.filterSource (path: type:
           baseNameOf path != "target"
         ) ./.;
-        cargoLock = { lockFile = ./Cargo.lock; };
+
+        cargoLock = { 
+          lockFile = ./Cargo.lock;
+          outputHashes = {
+            "fatfs-0.3.6" = "sha256-guMlE0AjG9W9Fm4gUGghE5F1JA7IkV35fZAbYn+nb98=";
+          };
+        };
 
         nativeBuildInputs = [ cargo-xbuild pkgs.llvmPackages_13.clang-unwrapped ];
         buildPhase = ''
@@ -141,10 +147,6 @@
           popd
         '';
 
-        outputHashes = {
-          "fatfs-0.3.6" = "";
-        };
-
         installPhase = ''
           mkdir -p $out $out/nix-support
           cp target/armv7-none-eabihf/release/${name} $out/${name}.elf
diff --git a/libsupport_zynq/Cargo.toml b/libsupport_zynq/Cargo.toml
index 093b220..3b24959 100644
--- a/libsupport_zynq/Cargo.toml
+++ b/libsupport_zynq/Cargo.toml
@@ -19,7 +19,7 @@ default = ["panic_handler", "dummy_irq_handler", "dummy_fiq_handler"]
 
 [dependencies]
 r0 = "1"
-compiler_builtins = "=0.1.39"
+compiler_builtins = "=0.1.49"
 linked_list_allocator = { version = "0.8", default-features = false, features = ["const_mut_refs"] }
 libregister = { path = "../libregister" }
 libcortex_a9 = { path = "../libcortex_a9" }