diff --git a/base-flake/flake.nix b/base-flake/flake.nix
index de38b41..0b83952 100644
--- a/base-flake/flake.nix
+++ b/base-flake/flake.nix
@@ -1,7 +1,7 @@
 {
   inputs = {
-    nixpkgs.url = github:NixOS/nixpkgs/nixpkgs-unstable;
-    utils.url = github:numtide/flake-utils;
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    utils.url = "github:numtide/flake-utils";
   };
 
   outputs = { self, nixpkgs, utils }:
diff --git a/rust-flake/flake.nix b/rust-flake/flake.nix
index 7be1d0b..4c9cd51 100644
--- a/rust-flake/flake.nix
+++ b/rust-flake/flake.nix
@@ -1,7 +1,7 @@
 {
   inputs = {
-    nixpkgs.url = github:NixOS/nixpkgs/nixpkgs-unstable;
-    utils.url = github:numtide/flake-utils;
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    utils.url = "github:numtide/flake-utils";
   };
 
   outputs = { self, nixpkgs, utils }: