diff --git a/MANIFEST.in b/MANIFEST.in
index 1f404d1..08c852d 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,3 +1,5 @@
 include LICENSE.txt
 include README.md
+include requirements.txt
+include requirements-dev.txt
 include pdfplumber/py.typed