diff --git a/flake.lock b/flake.lock
index 589123d..f021f33 100644
--- a/flake.lock
+++ b/flake.lock
@@ -35,11 +35,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1718428119,
-        "narHash": "sha256-WdWDpNaq6u1IPtxtYHHWpl5BmabtpmLnMAx0RdJ/vo8=",
+        "lastModified": 1736320768,
+        "narHash": "sha256-nIYdTAiKIGnFNugbomgBJR+Xv5F1ZQU+HfaBqJKroC0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "e6cea36f83499eb4e9cd184c8a8e823296b50ad5",
+        "rev": "4bc9c909d9ac828a039f288cf872d16d38185db8",
         "type": "github"
       },
       "original": {
@@ -61,16 +61,16 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1719454714,
-        "narHash": "sha256-MojqG0lyUINkEk0b3kM2drsU5vyaF8DFZe/FAlZVOGs=",
+        "lastModified": 1736572187,
+        "narHash": "sha256-it8mU8UkbaeVup7GpCI6n2cWPJ/O4U980CxKAMKUGF0=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "d1c527659cf076ecc4b96a91c702d080b213801e",
+        "rev": "06871d5c5f78b0ae846c5758702531b4cabfab9b",
         "type": "github"
       },
       "original": {
         "owner": "oxalica",
-        "ref": "snapshot/2024-08-01",
+        "ref": "snapshot/2025-01-11",
         "repo": "rust-overlay",
         "type": "github"
       }
diff --git a/flake.nix b/flake.nix
index bbfa8c2..b5b2f8f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,7 +3,7 @@
   inputs = {
     nixpkgs.url = "nixpkgs/nixos-23.11";
     flake-utils.url = "github:numtide/flake-utils";
-    rust-overlay.url = "github:oxalica/rust-overlay/snapshot/2024-08-01";  #< 2024-06-27 (TODO: update/un- pin)
+    rust-overlay.url = "github:oxalica/rust-overlay/snapshot/2025-01-11";  #< TODO: update/un- pin (last commit before rust toolchain < 2024-01-01 was removed)
   };
 
   outputs = { self, nixpkgs, flake-utils, rust-overlay }: