diff --git a/flake.lock b/flake.lock
index c2af207..1744e64 100644
--- a/flake.lock
+++ b/flake.lock
@@ -74,17 +74,17 @@
     },
     "nixpkgs-reference": {
       "locked": {
-        "lastModified": 1785793149,
-        "narHash": "sha256-B5AlPn6BLZakhO2iKJhishEj1Svy+3vNzK2xiPyqc2c=",
+        "lastModified": 1788850196,
+        "narHash": "sha256-g0p5f69J/28JqNEAvZrXiQ+0K3OZM1+kOVgd4D12QBw=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "aec71e3ada2e0b6bebd3d84c01523eb137dff06f",
+        "rev": "15859bbc22e38af043139505839aac26b3f61ec1",
         "type": "github"
       },
       "original": {
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "aec71e3ada2e0b6bebd3d84c01523eb137dff06f",
+        "rev": "15859bbc22e38af043139505839aac26b3f61ec1",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index aaf6187..c87d37b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -16,7 +16,7 @@
     # `tests/spec/REFERENCE.md` and re-recording any affected fixtures
     # in the same commit. `cargo xtask spec versions` reports drift
     # between this pin and the floating `nixpkgs` as advisory output.
-    nixpkgs-reference.url = "github:nixos/nixpkgs/aec71e3ada2e0b6bebd3d84c01523eb137dff06f";
+    nixpkgs-reference.url = "github:nixos/nixpkgs/15859bbc22e38af043139505839aac26b3f61ec1";
 
     rust-overlay = {
       url = "github:oxalica/rust-overlay";