diff --git a/Cargo.toml b/Cargo.toml
index 926ea064c..1d21ac642 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,6 +3,7 @@
 name = "ndarray"
 version = "0.15.5"
 edition = "2018"
+rust-version = "1.49"
 authors = [
   "Ulrik Sverdrup \"bluss\"",
   "Jim Turner"