diff --git a/.gitmodules b/.gitmodules
index 959a72ac..e92c76fd 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -29,3 +29,19 @@
 	path = deps/stb
 	url = https://github.com/nothings/stb.git
 	branch = develop
+[submodule "deps/libtomcrypt"]
+	path = deps/libtomcrypt
+	url = https://github.com/libtom/libtomcrypt.git
+	branch = develop
+[submodule "deps/libtommath"]
+	path = deps/libtommath
+	url = https://github.com/libtom/libtommath.git
+	branch = develop
+[submodule "deps/protobuf"]
+	path = deps/protobuf
+	url = https://github.com/protocolbuffers/protobuf.git
+	branch = 3.17.x
+[submodule "deps/zlib"]
+	path = deps/zlib
+	url = https://github.com/madler/zlib.git
+	branch = develop
diff --git a/deps/libtomcrypt b/deps/libtomcrypt
new file mode 160000
index 00000000..673f5ce2
--- /dev/null
+++ b/deps/libtomcrypt
@@ -0,0 +1 @@
+Subproject commit 673f5ce29015a9bba3c96792920a10601b5b0718
diff --git a/deps/libtommath b/deps/libtommath
new file mode 160000
index 00000000..66de8642
--- /dev/null
+++ b/deps/libtommath
@@ -0,0 +1 @@
+Subproject commit 66de86426e9cdb88526974c765108f01554af2b0
diff --git a/deps/protobuf b/deps/protobuf
new file mode 160000
index 00000000..5500c72c
--- /dev/null
+++ b/deps/protobuf
@@ -0,0 +1 @@
+Subproject commit 5500c72c5b616da9f0125bcfab513987a1226e2b
diff --git a/deps/zlib b/deps/zlib
new file mode 160000
index 00000000..2014a993
--- /dev/null
+++ b/deps/zlib
@@ -0,0 +1 @@
+Subproject commit 2014a993addbc8f1b9785d97f55fd189792c2f78