diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5e30ea5..bb57937 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,7 +28,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        rust: [1.39.0, stable]
+        rust: [1.43.0, stable]
         os: [ubuntu-latest, macOS-latest, windows-latest]
 
     steps:
diff --git a/README.md b/README.md
index eb9f735..3107535 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,8 @@ Using [`cargo-edit`](https://crates.io/crates/cargo-edit)
 
 `$ cargo add cacache`
 
+Minimum supported Rust version is `1.43.0`.
+
 ## Documentation
 
 - [API Docs](https://docs.rs/cacache)