diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..0991353
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,6 @@
+[submodule "third_party/packages/apscheduler"]
+	path = third_party/packages/apscheduler
+	url = https://github.com/agronholm/apscheduler.git
+[submodule "third_party/packages/ptpython"]
+	path = third_party/packages/ptpython
+	url = https://github.com/prompt-toolkit/ptpython.git
diff --git a/third_party/packages/apscheduler b/third_party/packages/apscheduler
new file mode 160000
index 0000000..cb50f0d
--- /dev/null
+++ b/third_party/packages/apscheduler
@@ -0,0 +1 @@
+Subproject commit cb50f0dab93fccf39c091062f48899ab4ac53a51
diff --git a/third_party/packages/ptpython b/third_party/packages/ptpython
new file mode 160000
index 0000000..89017ba
--- /dev/null
+++ b/third_party/packages/ptpython
@@ -0,0 +1 @@
+Subproject commit 89017ba158ed1d95319233fa5aedf3931c3b8b77