diff --git a/.github/workflows/CICD.yml b/.github/workflows/CICD.yml
index d0e322e..749270e 100644
--- a/.github/workflows/CICD.yml
+++ b/.github/workflows/CICD.yml
@@ -1,7 +1,7 @@
 name: CICD
 
 env:
-  MIN_SUPPORTED_RUST_VERSION: "1.39.0"
+  MIN_SUPPORTED_RUST_VERSION: "1.40.0"
   CICD_INTERMEDIATES_DIR: "_cicd-intermediates"
 
 on:
diff --git a/Cargo.lock b/Cargo.lock
index 0665869..c6b060a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,7 +1,5 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
-
 [[package]]
 name = "aho-corasick"
 version = "0.7.18"
diff --git a/README.md b/README.md
index fe55118..ed58018 100644
--- a/README.md
+++ b/README.md
@@ -122,7 +122,7 @@ or Windows Terminal since Windows 10 1903).
 
 ### Via cargo
 
-If you have Rust 1.39 or higher, you can install `hexyl` from source via `cargo`:
+If you have Rust 1.40 or higher, you can install `hexyl` from source via `cargo`:
 ```
 cargo install hexyl
 ```