diff --git a/MANIFEST.in b/MANIFEST.in
index b59c03c51..673dafadf 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -3,7 +3,6 @@ include CHANGES
 include COPYING*
 include INSTALL
 include README.rst
-include pyproject.toml
 include requirements/*.txt
 include lib/cartopy/data/*
 include lib/cartopy/io/srtm.npz
diff --git a/pyproject.toml b/pyproject.toml
deleted file mode 100644
index 5c445e72c..000000000
--- a/pyproject.toml
+++ /dev/null
@@ -1,2 +0,0 @@
-[build-system]
-requires = ["setuptools", "wheel", "numpy>=1.10"]