diff --git a/.gitmodules b/.gitmodules
index 045e6b935..ed1b5ebd9 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -13,4 +13,13 @@
 [submodule "submodules/cpp-base64"]
 	path = submodules/cpp-base64
 	url = https://github.com/ReneNyffenegger/cpp-base64.git
-	
+[submodule "submodules/googletest"]
+	path = submodules/googletest
+	url = https://github.com/google/googletest.git
+[submodule "submodules/libzip"]
+	path = submodules/libzip
+	url = https://github.com/nih-at/libzip.git
+[submodule "submodules/zlib"]
+	path = submodules/zlib
+	url = https://github.com/madler/zlib.git
+