diff --git a/Cargo.toml b/Cargo.toml
index 6e96f98..e34c355 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,6 +5,7 @@ authors = ["ANDYL Open Source <oss@andyl.com>"]
 version = "1.0.2-pre"
 edition = "2024"
 license = "MIT"
+rust-version = "1.88"
 
 [features]
 default = []
diff --git a/devenv.lock b/devenv.lock
index 59ac68e..cc66a53 100644
--- a/devenv.lock
+++ b/devenv.lock
@@ -3,10 +3,10 @@
     "devenv": {
       "locked": {
         "dir": "src/modules",
-        "lastModified": 1751987173,
+        "lastModified": 1752692978,
         "owner": "cachix",
         "repo": "devenv",
-        "rev": "9b4d2b5a4f650994045d6752de2ec48c1d9437a4",
+        "rev": "b2281100077d641cbf135e8680e973c0c2270bc4",
         "type": "github"
       },
       "original": {
@@ -94,7 +94,27 @@
         "nixpkgs": "nixpkgs",
         "pre-commit-hooks": [
           "git-hooks"
+        ],
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
         ]
+      },
+      "locked": {
+        "lastModified": 1752633862,
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "8668ca94858206ac3db0860a9dec471de0d995f8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
       }
     }
   },
diff --git a/devenv.nix b/devenv.nix
index dcfcf87..ad8c125 100644
--- a/devenv.nix
+++ b/devenv.nix
@@ -13,6 +13,8 @@
   ];
 
   languages.rust.enable = true;
+  languages.rust.channel = "stable";
+  languages.rust.version = "1.88.0";
 
   processes = lib.optionalAttrs (!config.devenv.isTesting) {
     cargo-watch.exec = "cargo-watch";
diff --git a/devenv.yaml b/devenv.yaml
new file mode 100644
index 0000000..c08ccc8
--- /dev/null
+++ b/devenv.yaml
@@ -0,0 +1,6 @@
+inputs:
+  rust-overlay:
+    url: github:oxalica/rust-overlay
+    inputs:
+      nixpkgs:
+        follows: nixpkgs
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..c2ee2a8
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,3 @@
+[toolchain]
+channel = "1.88"
+profile = "default"