diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 15bdda06..ae3d185d 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -4,16 +4,20 @@ on:
   push:
     branches:
       - master
-      - fork
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   tests:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ocamlVersion: [4_14, 5_0, 5_1]
+        ocamlVersion: [4_14, 5_1, 5_2]
     steps:
-    - uses: actions/checkout@v3
-    - uses: cachix/install-nix-action@v22
+    - uses: actions/checkout@v4
+    - uses: cachix/install-nix-action@v27
       with:
         extra_nix_config: |
           extra-substituters = https://anmonteiro.nix-cache.workers.dev
diff --git a/flake.lock b/flake.lock
index dcb14dcc..e512a704 100644
--- a/flake.lock
+++ b/flake.lock
@@ -41,11 +41,11 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1718687712,
-        "narHash": "sha256-siTiiFUgEq4xclUM+/wg14gsUnc2x7d8lJuE2CuYbKE=",
+        "lastModified": 1722479243,
+        "narHash": "sha256-SUCDX5vHsTrAR97ULPAD1PRjUimJ/fN7UMkU5PUyx3g=",
         "owner": "anmonteiro",
         "repo": "nix-overlays",
-        "rev": "f89fbc7d17156f3aa8b1e1b1d42ff7397d112674",
+        "rev": "9aff0027e012bcab72830693e2e740bc793a50db",
         "type": "github"
       },
       "original": {
@@ -56,17 +56,17 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1718632497,
-        "narHash": "sha256-YtlyfqOdYMuu7gumZtK0Kg7jr4OKfHUhJkZfNUryw68=",
+        "lastModified": 1722452851,
+        "narHash": "sha256-SdkmXWvYOIxgDksO5hobBwAZdc/pj7Okx0MferKgG9o=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "c58b4a9118498c1055c5908a5bbe666e56abe949",
+        "rev": "c68bae316281af1b80a1d12c6f56d2b92b6f2d3a",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "c58b4a9118498c1055c5908a5bbe666e56abe949",
+        "rev": "c68bae316281af1b80a1d12c6f56d2b92b6f2d3a",
         "type": "github"
       }
     },