diff --git a/README.md b/README.md
index 4be7be0..c0ffd50 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ of it I decided to create my own library.
 
 ## Installation
 
-These macros require a Rust compiler version 1.31 or newer.
+The MSRV is 1.39.0
 
 Add `itconfig = { version = "1.0", features = ["macro"] }` as a dependency in
 `Cargo.toml`.
diff --git a/examples/rocket/Cargo.toml b/examples/rocket/Cargo.toml
index ea6fe78..6d06eb3 100644
--- a/examples/rocket/Cargo.toml
+++ b/examples/rocket/Cargo.toml
@@ -2,7 +2,7 @@
 name = "itconfig-rocket-example"
 version = "0.1.0"
 authors = ["Dmitriy Pleshevskiy <dmitriy@ideascup.me>"]
-edition = "2021"
+edition = "2018"
 publish = false
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html