diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index 5f01af2..c3b28f8 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -24,7 +24,7 @@ jobs:
         os:
           - ubuntu-latest
         ocaml-compiler:
-          - "5.2.0"
+          - "5.2.1"
           - "4.14.2"
         local-packages:
           - zarr.opam
@@ -72,14 +72,14 @@ jobs:
       - name: setup
         run: |
           opam install --deps-only --with-test --with-doc --yes zarr
-          opam install bytesrw conf-zlib conf-zstd --yes
-          opam install lwt aws-s3-lwt --yes
+          opam install --deps-only --with-test --with-doc --yes zarr-sync
+          opam install --deps-only --with-test --with-doc --yes zarr-lwt
           opam exec -- dune build zarr zarr-sync zarr-lwt
       
       - name: setup ocaml-5-specific
-        if: ${{ matrix.ocaml-compiler == '5.2.0' }}
+        if: ${{ matrix.ocaml-compiler == '5.2.1' }}
         run: |
-          opam install eio_main --yes
+          opam install --deps-only --with-test --with-doc --yes zarr-eio
           opam exec -- dune build zarr-eio
 
       - name: test
@@ -89,29 +89,29 @@ jobs:
           opam exec -- dune exec --instrument-with bisect_ppx --force -- _build/default/zarr-lwt/test/test_lwt.exe -runner sequential -ci true
 
       - name: test ocaml-5-specific libs
-        if: ${{ matrix.ocaml-compiler == '5.2.0' }}
+        if: ${{ matrix.ocaml-compiler == '5.2.1' }}
         run: |
           opam exec -- dune exec --instrument-with bisect_ppx --force -- _build/default/zarr-eio/test/test_eio.exe -runner sequential -ci true
 
       - name: Upload code coverage report
-        if: ${{ matrix.ocaml-compiler == '5.2.0' }}
+        if: ${{ matrix.ocaml-compiler == '5.2.1' }}
         run: opam exec -- bisect-ppx-report send-to Codecov
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
 
       - name: Build Docs
-        if: ${{ matrix.ocaml-compiler == '5.2.0' }}
+        if: ${{ matrix.ocaml-compiler == '5.2.1' }}
         run: opam exec -- dune build @doc
 
       - name: Upload API Docs artifact
-        if: ${{ matrix.ocaml-compiler == '5.2.0' }}
+        if: ${{ matrix.ocaml-compiler == '5.2.1' }}
         uses: actions/upload-artifact@v3.1.3
         with:
           name: docs
           path: ./_build/default/_doc/_html
 
       - name: Deploy API Docs
-        if: ${{ matrix.ocaml-compiler == '5.2.0' }}
+        if: ${{ matrix.ocaml-compiler == '5.2.1' }}
         uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/dune-project b/dune-project
index 3c34f93..636c7c4 100644
--- a/dune-project
+++ b/dune-project
@@ -32,6 +32,7 @@
    (stdint (>= 0.7.2))
    (zipc (>= 0.2.0))
    (checkseum (>= 0.4.0))
+   (bytesrw (>= 0.1.0))
    (odoc :with-doc)
    (ounit2 :with-test)
    (ppx_deriving :with-test)
@@ -66,8 +67,10 @@
    (zarr (= :version))
    (lwt (>= 2.5.1))
    (aws-s3-lwt (>= 4.8.1))
+   (cohttp-lwt (>= 6.0.0))
    (odoc :with-doc)
    (ounit2 :with-test)
+   (tiny_httpd :with-test)
    (ppx_deriving :with-test)
    (bisect_ppx
      (and :dev (>= 2.5.0) :with-test))))
@@ -84,6 +87,7 @@
    (cohttp-eio (>= 6.0.0))
    (odoc :with-doc)
    (ounit2 :with-test)
+   (tiny_httpd :with-test)
    (ppx_deriving :with-test)
    (bisect_ppx
      (and :dev (>= 2.5.0) :with-test))))
diff --git a/zarr-eio.opam b/zarr-eio.opam
index f1601ca..d311a52 100644
--- a/zarr-eio.opam
+++ b/zarr-eio.opam
@@ -16,6 +16,7 @@ depends: [
   "cohttp-eio" {>= "6.0.0"}
   "odoc" {with-doc}
   "ounit2" {with-test}
+  "tiny_httpd" {with-test}
   "ppx_deriving" {with-test}
   "bisect_ppx" {dev & >= "2.5.0" & with-test}
 ]
diff --git a/zarr-lwt.opam b/zarr-lwt.opam
index f5e43a4..2d8b1b1 100644
--- a/zarr-lwt.opam
+++ b/zarr-lwt.opam
@@ -14,8 +14,10 @@ depends: [
   "zarr" {= version}
   "lwt" {>= "2.5.1"}
   "aws-s3-lwt" {>= "4.8.1"}
+  "cohttp-lwt" {>= "6.0.0"}
   "odoc" {with-doc}
   "ounit2" {with-test}
+  "tiny_httpd" {with-test}
   "ppx_deriving" {with-test}
   "bisect_ppx" {dev & >= "2.5.0" & with-test}
 ]
diff --git a/zarr.opam b/zarr.opam
index b70d30c..587af32 100644
--- a/zarr.opam
+++ b/zarr.opam
@@ -20,6 +20,7 @@ depends: [
   "stdint" {>= "0.7.2"}
   "zipc" {>= "0.2.0"}
   "checkseum" {>= "0.4.0"}
+  "bytesrw" {>= "0.1.0"}
   "odoc" {with-doc}
   "ounit2" {with-test}
   "ppx_deriving" {with-test}
@@ -40,6 +41,3 @@ build: [
   ]
 ]
 dev-repo: "git+https://github.com/zoj613/zarr-ml.git"
-pin-depends: [
-  ["bytesrw.dev" "git+https://erratique.ch/repos/bytesrw.git"]
-]
diff --git a/zarr.opam.template b/zarr.opam.template
deleted file mode 100644
index 4e82fcf..0000000
--- a/zarr.opam.template
+++ /dev/null
@@ -1,3 +0,0 @@
-pin-depends: [
-  ["bytesrw.dev" "git+https://erratique.ch/repos/bytesrw.git"]
-]