diff --git a/flake.nix b/flake.nix
index 0a51a05c07..cc949a0fe8 100644
--- a/flake.nix
+++ b/flake.nix
@@ -20,7 +20,10 @@
     , ...
     }: flake-utils.lib.eachDefaultSystem (system:
     let
-      pkgs = import nixpkgs { inherit system; };
+      pkgs = import nixpkgs {
+        inherit system;
+        overlays = [ (import ./overlays/nixpkgs.nix) ];
+      };
       inherit (pkgs) lib;
       treefmtEval = treefmt-nix.lib.evalModule pkgs ./treefmt.nix;
     in
diff --git a/overlays/nixpkgs.nix b/overlays/nixpkgs.nix
new file mode 100644
index 0000000000..73c30a88f9
--- /dev/null
+++ b/overlays/nixpkgs.nix
@@ -0,0 +1,11 @@
+final: prev: {
+  # Drop when the update reaches the unstable channel:
+  # https://nixpk.gs/pr-tracker.html?pr=293563
+  go = prev.go.overrideAttrs (finalAttrs: _prevAttrs: {
+    version = "1.21.8";
+    src = final.fetchurl {
+      url = "https://go.dev/dl/go${finalAttrs.version}.src.tar.gz";
+      hash = "sha256-3IBs91qH4UFLW0w9y53T6cyY9M/M7EK3r2F9WmWKPEM=";
+    };
+  });
+}