diff --git a/.github/workflows/cli.yml b/.github/workflows/cli.yml
index 762d48f83..ecb1cf869 100644
--- a/.github/workflows/cli.yml
+++ b/.github/workflows/cli.yml
@@ -20,10 +20,18 @@ jobs:
         with:
           submodules: recursive
 
-      - uses: cachix/install-nix-action@v15
+      - uses: cachix/install-nix-action@v16
         with:
           nix_path: nixpkgs=channel:nixos-unstable
 
+      - name: Remove non-nix binary
+        run: rm -rf ~/.cargo/bin
+
+      - name: Clippy cargo-sewup
+        run: nix develop --ignore-environment -c cargo clippy -p cargo-sewup
+        env:
+          RUST_BACKTRACE: 1
+
       - name: Init default project test
         run: nix develop -c 'cli-init-test' default
 
diff --git a/.github/workflows/crate.yml b/.github/workflows/crate.yml
index 3efdbde9d..bfdbb072d 100644
--- a/.github/workflows/crate.yml
+++ b/.github/workflows/crate.yml
@@ -28,12 +28,20 @@ jobs:
           VALIDATE_RUST_2018: true
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
-      - uses: cachix/install-nix-action@v15
+      - uses: cachix/install-nix-action@v16
         with:
           nix_path: nixpkgs=channel:nixos-unstable
 
+      - name: Remove non-nix binary
+        run: rm -rf ~/.cargo/bin
+
+      - name: Clippy sewup
+        run: nix develop -c cargo clippy -p sewup
+        env:
+          RUST_BACKTRACE: 1
+
       - name: Default feature test
-        run: nix develop -c 'cargo' test -p sewup --features=default
+        run: nix develop -c cargo test -p sewup --features=default
 
       - name: RDB feature test
-        run: nix develop -c 'cargo' test -p sewup --features=rdb --no-default-features
+        run: nix develop -c cargo test -p sewup --features=rdb --no-default-features
diff --git a/.github/workflows/derive.yml b/.github/workflows/derive.yml
index 951d84ba2..9bbac7f7f 100644
--- a/.github/workflows/derive.yml
+++ b/.github/workflows/derive.yml
@@ -20,9 +20,17 @@ jobs:
         with:
           submodules: recursive
 
-      - uses: cachix/install-nix-action@v15
+      - uses: cachix/install-nix-action@v16
         with:
           nix_path: nixpkgs=channel:nixos-unstable
 
+      - name: Remove non-nix binary
+        run: rm -rf ~/.cargo/bin
+
+      - name: Clippy sewup-derive
+        run: nix develop --ignore-environment -c cargo clippy -p sewup-derive
+        env:
+          RUST_BACKTRACE: 1
+
       - name: Derive test
-        run: nix develop -c 'cargo' test -p sewup-derive
+        run: nix develop -c cargo test -p sewup-derive
diff --git a/flake.lock b/flake.lock
index 883e0b340..c39381ed8 100644
--- a/flake.lock
+++ b/flake.lock
@@ -32,17 +32,18 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1638097282,
-        "narHash": "sha256-EXCzj9b8X/lqDPJapxZThIOKL5ASbpsJZ+8L1LnY1ig=",
-        "owner": "NixOS",
+        "lastModified": 1638535497,
+        "narHash": "sha256-tk5LNbdkUhALp00+r5ZmQ3t7n2d5M7YUQB+MznWvVOg=",
+        "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "78cb77b29d37a9663e05b61abb4fa09465da4b70",
+        "rev": "c71f061c68ba8ce53471b767d5049cbd0f3d8490",
         "type": "github"
       },
       "original": {
-        "id": "nixpkgs",
-        "ref": "nixpkgs-unstable",
-        "type": "indirect"
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
       }
     },
     "nixpkgs_2": {
@@ -74,11 +75,11 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1638152159,
-        "narHash": "sha256-Q0UHsm36cCxk16I/bF1rHJHxjIflESKk2ej76P39j90=",
+        "lastModified": 1638757066,
+        "narHash": "sha256-EkWnmOLc3/8xGDOGhIau4v0EUZ9emEpXJZyOVoryDh8=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "d9a664513558376595e838b21348cdac0ba3115e",
+        "rev": "96f1bd1ec11d9c9e8b41c7560df9efae8d091908",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index ea287bfc1..769a01383 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,7 +1,7 @@
 {
 
   inputs = {
-    nixpkgs.url = "nixpkgs/nixpkgs-unstable";
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
     rust-overlay.url = "github:oxalica/rust-overlay";
     flake-utils.url = "github:numtide/flake-utils";
   };