diff --git a/.gitmodules b/.gitmodules
index a5c8e98946feaffc269892a68b641eb84975baaa..982b62b231e5c376a95eb127a6e904dda6630cd6 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,12 +1,12 @@
 [submodule "doc_module_anc"]
 	path = doc_module_anc
-	url = http://gitlab.veremes.net/Documentation/doc_module_anc.git
+	url = https://gitlab.veremes.net/Documentation/doc_module_anc.git
 [submodule "doc_module_vitis"]
 	path = doc_module_vitis
-	url = http://gitlab.veremes.net/Documentation/doc_module_vitis.git
+	url = https://gitlab.veremes.net/Documentation/doc_module_vitis.git
 [submodule "doc_module_vmap"]
 	path = doc_module_vmap
-	url = http://gitlab.veremes.net/Documentation/doc_module_vmap.git
+	url = https://gitlab.veremes.net/Documentation/doc_module_vmap.git
 [submodule "doc_module_studio"]
 	path = doc_module_studio
-	url = http://gitlab.veremes.net/Documentation/doc_module_studio.git
+	url = https://gitlab.veremes.net/Documentation/doc_module_studio.git