diff --git a/MANIFEST.in b/MANIFEST.in
index 22c6165d..a122460c 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,6 +1,8 @@
 include LICENSE
 include README.md
 
+recursive-include tests *
+
 global-include *.pyi
 
 recursive-exclude * __pycache__
diff --git a/Makefile b/Makefile
index 06d85b7c..f91dd720 100644
--- a/Makefile
+++ b/Makefile
@@ -69,7 +69,7 @@ notes: check-bump
 	make build-docs
 	git commit -m "Compile release notes"
 
-release: check-bump clean
+release: check-bump test clean
 	# require that you be on a branch that's linked to upstream/main
 	git status -s -b | head -1 | grep "\.\.upstream/main"
 	# verify that docs build correctly