diff --git a/flake.nix b/flake.nix
index 8ed69a3..32e9322 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,12 +1,12 @@
 {
   inputs = {
     
-    nixpkgs.url = github:NixOS/nixpkgs/nixos-unstable;
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
 
-    libgourou-utils.url = github:BentonEdmondson/libgourou-utils;
+    libgourou-utils.url = "github:BentonEdmondson/libgourou-utils";
     libgourou-utils.inputs.nixpkgs.follows = "nixpkgs";
 
-    inept-epub.url = github:BentonEdmondson/inept-epub;
+    inept-epub.url = "github:BentonEdmondson/inept-epub";
     inept-epub.inputs.nixpkgs.follows = "nixpkgs";
   };