diff --git a/MANIFEST.in b/MANIFEST.in
index 9fd792ed..0cb61074 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,2 +1,5 @@
+include loki/py.typed
 include grizzly/common/harness.html
 include grizzly/common/post_launch_delay.html
+include grizzly/py.typed
+include sapphire/py.typed
diff --git a/grizzly/py.typed b/grizzly/py.typed
new file mode 100644
index 00000000..e69de29b
diff --git a/loki/py.typed b/loki/py.typed
new file mode 100644
index 00000000..e69de29b
diff --git a/sapphire/py.typed b/sapphire/py.typed
new file mode 100644
index 00000000..e69de29b