diff --git a/flake.nix b/flake.nix
index 5676f5a5fc..72a067a36c 100644
--- a/flake.nix
+++ b/flake.nix
@@ -381,4 +381,13 @@
 
         devShell = devShells.haskell-language-server-dev;
       });
+
+  nixConfig = {
+    extra-substituters = [
+      "https://haskell-language-server.cachix.org"
+    ];
+    extra-trusted-public-keys = [
+      "haskell-language-server.cachix.org-1:juFfHrwkOxqIOZShtC4YC1uT1bBcq2RSvC7OMKx0Nz8="
+    ];
+  };
 }