diff --git a/Cargo.toml b/Cargo.toml
index 2e07b86..d1405eb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ authors = ["Fintan Halpenny <fintan.halpenny@gmail.com>"]
 edition = "2021"
 # N.B. always use the full semver so that rust-overlay in `flake.nix` can select
 # the correct version
-rust-version = "1.85.0"
+rust-version = "1.85.1"
 
 [dependencies]
 chrono = { version = "0.4.42", default-features = false }
diff --git a/flake.nix b/flake.nix
index 021e253..abc3591 100644
--- a/flake.nix
+++ b/flake.nix
@@ -102,6 +102,7 @@
         # Extra inputs can be added here; cargo and rustc are provided by default
         # from the toolchain that was specified earlier.
         packages = with pkgs; [
+          cargo-msrv
           cargo-nextest
           cargo-release
           cargo-semver-checks