diff --git a/pkgs/by-name/ge/gentium-book/package.nix b/pkgs/by-name/ge/gentium-book/package.nix
index 30080ccce838..1eeaed998dfe 100644
--- a/pkgs/by-name/ge/gentium-book/package.nix
+++ b/pkgs/by-name/ge/gentium-book/package.nix
@@ -9,7 +9,7 @@ stdenvNoCC.mkDerivation (finalAttrs: {
   version = "7.000";
 
   src = fetchzip {
-    url = "http://software.sil.org/downloads/r/gentium/GentiumBook-${finalAttrs.version}.zip";
+    url = "https://software.sil.org/downloads/r/gentium/GentiumBook-${finalAttrs.version}.zip";
     hash = "sha256-A/QZX8OYrifaxChC08SNOaspdnSr8PxOtYgFAwUc5WY=";
   };