diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 4473d12..2a4b57c 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -47,7 +47,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # NB: Sync MSRV with Cargo.toml!
+        # NB: Sync MSRV with Cargo.toml and rust-toolchain.toml!
         rust: [stable, beta, "1.88"]
     name: Test ${{ matrix.rust }}
     # Need libsqlite3-dev >= 3.38.0 (2022-02-22)
diff --git a/Cargo.toml b/Cargo.toml
index 540d710..e7a0d93 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ default-members = ["blahd"]
 
 [workspace.package]
 edition = "2024"
-# NB: Sync MSRV with CI!
+# NB: Sync MSRV with CI and rust-toolchain.toml!
 rust-version = "1.88" # let_chains
 
 [workspace.lints.clippy]
diff --git a/flake.lock b/flake.lock
index ba9ea12..5711c10 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,17 +1,40 @@
 {
   "nodes": {
+    "fenix": {
+      "inputs": {
+        "nixpkgs": [
+          "naersk",
+          "nixpkgs"
+        ],
+        "rust-analyzer-src": "rust-analyzer-src"
+      },
+      "locked": {
+        "lastModified": 1752475459,
+        "narHash": "sha256-z6QEu4ZFuHiqdOPbYss4/Q8B0BFhacR8ts6jO/F/aOU=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "bf0d6f70f4c9a9cf8845f992105652173f4b617f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
     "naersk": {
       "inputs": {
+        "fenix": "fenix",
         "nixpkgs": [
           "nixpkgs"
         ]
       },
       "locked": {
-        "lastModified": 1739824009,
-        "narHash": "sha256-fcNrCMUWVLMG3gKC5M9CBqVOAnJtyRvGPxptQFl5mVg=",
+        "lastModified": 1752689277,
+        "narHash": "sha256-uldUBFkZe/E7qbvxa3mH1ItrWZyT6w1dBKJQF/3ZSsc=",
         "owner": "nix-community",
         "repo": "naersk",
-        "rev": "e5130d37369bfa600144c2424270c96f0ef0e11d",
+        "rev": "0e72363d0938b0208d6c646d10649164c43f4d64",
         "type": "github"
       },
       "original": {
@@ -22,11 +45,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1742288794,
-        "narHash": "sha256-Txwa5uO+qpQXrNG4eumPSD+hHzzYi/CdaM80M9XRLCo=",
+        "lastModified": 1757487488,
+        "narHash": "sha256-zwE/e7CuPJUWKdvvTCB7iunV4E/+G0lKfv4kk/5Izdg=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "b6eaf97c6960d97350c584de1b6dcff03c9daf42",
+        "rev": "ab0f3607a6c7486ea22229b92ed2d355f1482ee0",
         "type": "github"
       },
       "original": {
@@ -43,6 +66,23 @@
         "rust-overlay": "rust-overlay"
       }
     },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1752428706,
+        "narHash": "sha256-EJcdxw3aXfP8Ex1Nm3s0awyH9egQvB2Gu+QEnJn2Sfg=",
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "591e3b7624be97e4443ea7b5542c191311aa141d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
+    },
     "rust-overlay": {
       "inputs": {
         "nixpkgs": [
@@ -50,11 +90,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1742351546,
-        "narHash": "sha256-GPubFcOXyi8TVm1xpltHYPcfGr+iO+if2u/EtzFVnHQ=",
+        "lastModified": 1757558036,
+        "narHash": "sha256-DyZaeaHy8iibckZ63XOqYJtEHc3kmVy8JrBIBV/GQHI=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "b0a7450168c62a46f87d204280e6d9d1c0292671",
+        "rev": "b8adf899786b7b77b8c3636a9b753e3622f00db0",
         "type": "github"
       },
       "original": {
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..f9900d0
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,4 @@
+[toolchain]
+channel = "1.88" # NB: Sync MSRV with Cargo.toml and CI!
+profile = "default"
+components = ["llvm-tools"]