diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 63e3f8d..b6e9358 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -25,8 +25,8 @@ jobs:
           - ubuntu-latest
           - windows-latest
         ocaml-compiler:
-          - 4.14.x
-          - 5.0.x
+          - 5.1.x
+          - 5.2.x
 
     runs-on: ${{ matrix.os }}
 
@@ -57,7 +57,7 @@ jobs:
       fail-fast: false
       matrix:
         ocaml-compiler:
-          - 4.14.x
+          - 5.2.x
     steps:
       - uses: actions/checkout@v3
       - name: Use OCaml ${{ matrix.ocaml-compiler }}
diff --git a/flake.lock b/flake.lock
index 28e1149..d900fa5 100644
--- a/flake.lock
+++ b/flake.lock
@@ -18,6 +18,24 @@
         "type": "github"
       }
     },
+    "flake-utils_2": {
+      "inputs": {
+        "systems": "systems_2"
+      },
+      "locked": {
+        "lastModified": 1726560853,
+        "narHash": "sha256-X6rJYSESBVr3hBoH0WbKE5KvhPU5bloyZ2L4K60/fPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c1dfcf08411b08f6b8615f7d8971a2bfa81d5e8a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "nix-filter": {
       "locked": {
         "lastModified": 1710156097,
@@ -34,17 +52,37 @@
       }
     },
     "nixpkgs": {
+      "inputs": {
+        "flake-utils": "flake-utils_2",
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1727644383,
+        "narHash": "sha256-5zVGeKR/NEazNsjwlIgoxjHzvf1W0O7V5DFAc97sLek=",
+        "owner": "nix-ocaml",
+        "repo": "nix-overlays",
+        "rev": "9eb3220e9898a1209d824aafebb3f7b10cf89cd6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-ocaml",
+        "repo": "nix-overlays",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
       "locked": {
-        "lastModified": 1715534435,
-        "narHash": "sha256-mEkBIwOuOERXsw+k5xK/Cskz754diaoX2rhePpyOKZg=",
-        "owner": "nixos",
+        "lastModified": 1727631725,
+        "narHash": "sha256-3BhOfmcg9Pxjm/kU+IVYe76CvHL6zArK9ktlCJeP06E=",
+        "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "6046e8807481cfcbc143897f2e323772d251b693",
+        "rev": "b5c4f45cfcaa5a44632c7119922987e131249cd2",
         "type": "github"
       },
       "original": {
-        "owner": "nixos",
+        "owner": "NixOS",
         "repo": "nixpkgs",
+        "rev": "b5c4f45cfcaa5a44632c7119922987e131249cd2",
         "type": "github"
       }
     },
@@ -69,6 +107,21 @@
         "repo": "default",
         "type": "github"
       }
+    },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
     }
   },
   "root": "root",
diff --git a/flake.nix b/flake.nix
index 951d7f6..31992de 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,7 +3,7 @@
 
   inputs.nix-filter.url = "github:numtide/nix-filter";
   inputs.flake-utils.url = "github:numtide/flake-utils";
-  inputs.nixpkgs.url = "github:nixos/nixpkgs";
+  inputs.nixpkgs.url = "github:nix-ocaml/nix-overlays";
 
   outputs = { self, nixpkgs, flake-utils, nix-filter }:
     flake-utils.lib.eachDefaultSystem (system:
diff --git a/lev-fiber-csexp/test/dune b/lev-fiber-csexp/test/dune
index 0d144a3..2bbfcf4 100644
--- a/lev-fiber-csexp/test/dune
+++ b/lev-fiber-csexp/test/dune
@@ -13,7 +13,7 @@
   ;; in dune-project
   ppx_expect.config
   ppx_expect.config_types
-  ppx_expect.common
+  ppx_expect
   base
   ppx_inline_test.config)
  (inline_tests)
diff --git a/lev-fiber/test/dune b/lev-fiber/test/dune
index fb24190..441635f 100644
--- a/lev-fiber/test/dune
+++ b/lev-fiber/test/dune
@@ -11,7 +11,7 @@
   ;; in dune-project
   ppx_expect.config
   ppx_expect.config_types
-  ppx_expect.common
+  ppx_expect
   base
   ppx_inline_test.config)
  (inline_tests)
diff --git a/lev-fiber/test/util/dune b/lev-fiber/test/util/dune
index e903c60..2929abb 100644
--- a/lev-fiber/test/util/dune
+++ b/lev-fiber/test/util/dune
@@ -9,7 +9,7 @@
   ;; in dune-project
   ppx_expect.config
   ppx_expect.config_types
-  ppx_expect.common
+  ppx_expect
   base
   ppx_inline_test.config)
  (inline_tests)
diff --git a/lev/test/dune b/lev/test/dune
index e4b014b..5bc7a91 100644
--- a/lev/test/dune
+++ b/lev/test/dune
@@ -7,7 +7,7 @@
   ;; in dune-project
   ppx_expect.config
   ppx_expect.config_types
-  ppx_expect.common
+  ppx_expect
   base
   ppx_inline_test.config)
  (inline_tests)
@@ -23,7 +23,7 @@
   ;; in dune-project
   ppx_expect.config
   ppx_expect.config_types
-  ppx_expect.common
+  ppx_expect
   base
   ppx_inline_test.config)
  (inline_tests
@@ -42,7 +42,7 @@
   ;; in dune-project
   ppx_expect.config
   ppx_expect.config_types
-  ppx_expect.common
+  ppx_expect
   base
   ppx_inline_test.config)
  (inline_tests