diff --git a/flake.lock b/flake.lock
index 4f1a905f..ed9ab6dc 100644
--- a/flake.lock
+++ b/flake.lock
@@ -5,11 +5,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1705309234,
-        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
         "type": "github"
       },
       "original": {
@@ -28,11 +28,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1705314449,
-        "narHash": "sha256-yfQQ67dLejP0FLK76LKHbkzcQqNIrux6MFe32MMFGNQ=",
+        "lastModified": 1741396135,
+        "narHash": "sha256-wqmdLr7h4Bk8gyKutgaApJKOM8JVvywI5P48NuqJ9Jg=",
         "owner": "nix-community",
         "repo": "gomod2nix",
-        "rev": "30e3c3a9ec4ac8453282ca7f67fca9e1da12c3e6",
+        "rev": "0983848bf2a7ccbfe24d874065adb8fd0f23729b",
         "type": "github"
       },
       "original": {
@@ -43,17 +43,17 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1705856552,
-        "narHash": "sha256-JXfnuEf5Yd6bhMs/uvM67/joxYKoysyE3M2k6T3eWbg=",
+        "lastModified": 1710843028,
+        "narHash": "sha256-CMbK45c4nSkGvayiEHFkGFH+doGPbgo3AWfecd2t1Fk=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "612f97239e2cc474c13c9dafa0df378058c5ad8d",
+        "rev": "33c51330782cb486764eb598d5907b43dc87b4c2",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-unstable",
         "repo": "nixpkgs",
+        "rev": "33c51330782cb486764eb598d5907b43dc87b4c2",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index 4d7480a9..d069177a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,7 +1,8 @@
 {
   description = "基于 ZeroBot 的 OneBot 插件";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  # pin nixpkgs to preserve dropped go_1_20
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/33c51330782cb486764eb598d5907b43dc87b4c2";
   inputs.flake-utils.url = "github:numtide/flake-utils";
   inputs.gomod2nix.url = "github:nix-community/gomod2nix";
   inputs.gomod2nix.inputs.nixpkgs.follows = "nixpkgs";