diff --git a/.gitmodules b/.gitmodules
index cc9a92df58f45891463809c0483dd472c42af201..b778a6b6e973fb341530332a0e9c7303a2b6533e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,9 +1,9 @@
 [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_calimap"]
 	path = doc_module_calimap
-	url = http://gitlab.veremes.net/Documentation/doc_module_calimap.git
+	url = https://gitlab.veremes.net/Documentation/doc_module_calimap.git
 [submodule "doc_module_gracethd"]
 	path = doc_module_gracethd
-	url = http://gitlab.veremes.net/Documentation/doc_module_gracethd.git
+	url = https://gitlab.veremes.net/Documentation/doc_module_gracethd.git