diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..3550a30
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake
diff --git a/.gitignore b/.gitignore
index 03c81f8..f2d3cc8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@ target
 result
 mosquitto
 s140_*_softdevice.hex
+.direnv/
diff --git a/flake.nix b/flake.nix
index e9f5dfa..0562ff8 100644
--- a/flake.nix
+++ b/flake.nix
@@ -74,7 +74,7 @@
           with fenix.packages.${system};
           fromToolchainFile {
             file = ./rust-toolchain.toml;
-            sha256 = "sha256-yrQPCdDVYQlF7MSAZP+R4DKigWY3PSTs0Re42v7CDNs=";
+            sha256 = "sha256-LqLkRalgBChXud42w4/im8z6vHjzv3uMOJKRlMqSFLQ=";
           };
       in
       with pkgs;