diff --git a/.github/workflows/opam.yml b/.github/workflows/opam.yml
index e031f9c51..b1ba2e39c 100644
--- a/.github/workflows/opam.yml
+++ b/.github/workflows/opam.yml
@@ -24,7 +24,7 @@ jobs:
           # disabling this for now
 
         ocaml-compiler:
-          - ocaml-base-compiler.5.4.0
+          - ocaml-base-compiler.5.5.2
 
     runs-on: ${{ matrix.os }}
 
diff --git a/Makefile b/Makefile
index 4389424e3..4f3f58500 100644
--- a/Makefile
+++ b/Makefile
@@ -63,7 +63,7 @@ install: ## Update the package dependencies when new deps are added to dune-proj
 
 .PHONY: init
 create-switch: ## Create a local opam switch
-	@opam switch create . 5.2.0 --no-install -y
+	@opam switch create . 5.5.2 --no-install -y
 
 .PHONY: init
 init: create-switch install ## Create a local opam switch, install deps
diff --git a/dune-project b/dune-project
index 13a81fbf7..14f795be1 100644
--- a/dune-project
+++ b/dune-project
@@ -40,10 +40,6 @@
   (reason
    (>= 3.12.0))
   (ocaml-lsp-server :with-dev-setup)
-  (opam-check-npm-deps
-   (and
-    :dev
-    :with-dev-setup))
   (ocamlformat
    (and
     (= 0.28.1)
diff --git a/flake.lock b/flake.lock
index bc62ad060..b6873baa1 100644
--- a/flake.lock
+++ b/flake.lock
@@ -5,11 +5,11 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1769895423,
-        "narHash": "sha256-TrMaENJ5V+2zNUGrb6dj11rNiQGaRzu/S79dKeOJVyU=",
+        "lastModified": 1792972641,
+        "narHash": "sha256-zN77Jq1yPE3l8pCa65ZFzpzTq3HWC1TPWFTCD5feCOo=",
         "owner": "nix-ocaml",
         "repo": "nix-overlays",
-        "rev": "1ccfa0c4e189b360af5efd4a97bdcdb8ba06c532",
+        "rev": "75604672d0796836d59060a50dc14dee6a21e226",
         "type": "github"
       },
       "original": {
@@ -20,17 +20,17 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1769857600,
-        "narHash": "sha256-OD08gxDrlLYQQSKzM1lprIYBbzE69E+p0JYImLUNbHk=",
+        "lastModified": 1792925778,
+        "narHash": "sha256-aCg6fAHZszDX68IsLPUm/NQ7ZVXMHk74bjHAIr8K5dM=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "fbecbb2032376ee9bd3e95c14a3b070cf3f4e079",
+        "rev": "acc2ec71996e90e6e011fa14979b13cdc070ec79",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "fbecbb2032376ee9bd3e95c14a3b070cf3f4e079",
+        "rev": "acc2ec71996e90e6e011fa14979b13cdc070ec79",
         "type": "github"
       }
     },
diff --git a/flake.nix b/flake.nix
index 228d9d89d..e3df6964f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -15,7 +15,7 @@
           let
             pkgs = nixpkgs.legacyPackages.${system}.extend (
               self: super: {
-                ocamlPackages = super.ocaml-ng.ocamlPackages_5_4;
+                ocamlPackages = super.ocaml-ng.ocamlPackages_5_5;
               }
             );
           in
diff --git a/reason-react.opam b/reason-react.opam
index fda16342c..3212c6d79 100644
--- a/reason-react.opam
+++ b/reason-react.opam
@@ -23,7 +23,6 @@ depends: [
   "reason-react-ppx" {= version}
   "reason" {>= "3.12.0"}
   "ocaml-lsp-server" {with-dev-setup}
-  "opam-check-npm-deps" {dev & with-dev-setup}
   "ocamlformat" {= "0.28.1" & with-dev-setup}
   "odoc" {with-doc}
 ]
@@ -46,6 +45,3 @@ depexts: [
   ["react"] {npm-version = "^19.1.0"}
   ["react-dom"] {npm-version = "^19.1.0"}
 ]
-pin-depends: [
-  [ "opam-check-npm-deps.dev" "git+https://github.com/ahrefs/opam-check-npm-deps.git#4.1.0"]
-]
diff --git a/reason-react.opam.template b/reason-react.opam.template
index e6a453ca1..71bb69881 100644
--- a/reason-react.opam.template
+++ b/reason-react.opam.template
@@ -2,6 +2,3 @@ depexts: [
   ["react"] {npm-version = "^19.1.0"}
   ["react-dom"] {npm-version = "^19.1.0"}
 ]
-pin-depends: [
-  [ "opam-check-npm-deps.dev" "git+https://github.com/ahrefs/opam-check-npm-deps.git#4.1.0"]
-]
diff --git a/test/blackbox-tests/dune b/test/blackbox-tests/dune
index 83224c3c1..8840bbc51 100644
--- a/test/blackbox-tests/dune
+++ b/test/blackbox-tests/dune
@@ -1,4 +1,5 @@
 (cram
  (package reason-react)
  (deps
-  (package reason-react)))
+  (package reason-react)
+  (package reason-react-ppx)))