diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..ad807cc
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1,2 @@
+include CITATION.cff CONTRIBUTING.md
+exclude tests*/*
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index f887263..cfd76cf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,5 @@
 [build-system]
 requires = ["setuptools"]
-build-backend = "setuptools.build_meta"
 
 [project]
 name = 'inline_reference'
@@ -50,4 +49,4 @@ docs = [
 ]
 
 [project.urls]
-Repository = "https://github.com/pace-neutrons/inline_reference"
\ No newline at end of file
+Repository = "https://github.com/pace-neutrons/inline_reference"