diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..760693b
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,16 @@
+[submodule "deps/libtommath"]
+	path = deps/libtommath
+	url = https://github.com/libtom/libtommath.git
+	branch = develop
+[submodule "deps/libtomcrypt"]
+	path = deps/libtomcrypt
+	url = https://github.com/libtom/libtomcrypt.git
+	branch = develop
+[submodule "deps/zlib"]
+	path = deps/zlib
+	url = https://github.com/madler/zlib.git
+	branch = develop
+[submodule "deps/HDiffPatch"]
+	path = deps/HDiffPatch
+	url = https://github.com/sisong/HDiffPatch.git
+	branch = master
diff --git a/deps/HDiffPatch b/deps/HDiffPatch
new file mode 160000
index 0000000..fddc5a5
--- /dev/null
+++ b/deps/HDiffPatch
@@ -0,0 +1 @@
+Subproject commit fddc5a50ebd396d43475ac51d130888595d5f902
diff --git a/deps/libtomcrypt b/deps/libtomcrypt
new file mode 160000
index 0000000..01c455c
--- /dev/null
+++ b/deps/libtomcrypt
@@ -0,0 +1 @@
+Subproject commit 01c455c3d5f781312de84594a11e102a20d5b959
diff --git a/deps/libtommath b/deps/libtommath
new file mode 160000
index 0000000..f9eec43
--- /dev/null
+++ b/deps/libtommath
@@ -0,0 +1 @@
+Subproject commit f9eec4350eb6686c4a279b2108c47864e610551b
diff --git a/deps/zlib b/deps/zlib
new file mode 160000
index 0000000..41d86c7
--- /dev/null
+++ b/deps/zlib
@@ -0,0 +1 @@
+Subproject commit 41d86c73b21191a3fa9ea5f476fc9f1fc5e4f8b3