diff --git a/tools/pylib/_boutcore_build/setup.cfg.in b/tools/pylib/_boutcore_build/setup.cfg.in
index 376d288e738875e7b0527babddc4e40ed6a2e576..58720524c5e1b89d23a229730c0a6f663f0932d9 100644
--- a/tools/pylib/_boutcore_build/setup.cfg.in
+++ b/tools/pylib/_boutcore_build/setup.cfg.in
@@ -42,8 +42,9 @@ setup_requires =
     cython
     numpy
 install_requires =
-    cython
-    numpy
+EOF
+echo "    numpy==$(python -c 'from numpy.version import version;print(version)')"
+cat << "EOF"
 tests_require =
     pytest >= 3.3.0
 include_package_data = True