diff --git a/lax/Cargo.toml b/lax/Cargo.toml
index 076d5cf2..e6479c51 100644
--- a/lax/Cargo.toml
+++ b/lax/Cargo.toml
@@ -2,7 +2,7 @@
 name = "lax"
 version = "0.17.0"
 authors = ["Toshiki Teramura <toshiki.teramura@gmail.com>"]
-edition = "2018"
+edition = "2021"
 
 description   = "LAPACK wrapper without ndarray"
 documentation = "https://docs.rs/lax/"
diff --git a/ndarray-linalg/Cargo.toml b/ndarray-linalg/Cargo.toml
index 8c5c83a8..86589baf 100644
--- a/ndarray-linalg/Cargo.toml
+++ b/ndarray-linalg/Cargo.toml
@@ -2,7 +2,7 @@
 name    = "ndarray-linalg"
 version = "0.17.0"
 authors = ["Toshiki Teramura <toshiki.teramura@gmail.com>"]
-edition = "2018"
+edition = "2021"
 
 description   = "Linear algebra package for rust-ndarray using LAPACK"
 documentation = "https://docs.rs/ndarray-linalg/"