diff --git a/.gitmodules b/.gitmodules
index 8170523af..f3f8da8fd 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "Testing/Data"]
 	path = Testing/Data
-	url = git://git.code.sf.net/p/gdcm/gdcmdata
+	url = https://git.code.sf.net/p/gdcm/gdcmdata