diff --git a/.gitmodules b/.gitmodules
index 7ecb497ea..869980fa0 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,6 +1,6 @@
 [submodule "submodules/nix-writers"]
 	path = submodules/nix-writers
-	url = http://cgit.krebsco.de/nix-writers
+	url = https://cgit.krebsco.de/nix-writers
 [submodule "submodules/krops"]
 	path = submodules/krops
 	url = https://cgit.krebsco.de/krops