diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3c6ebb9b13..257a5f0cce 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -34,7 +34,7 @@ jobs:
     runs-on: ${{matrix.os}}
 
     container:
-      image: ghcr.io/rescript-lang/rescript-ci-build:v1.1.0
+      image: ghcr.io/rescript-lang/rescript-ci-build:v1.2.0
 
     steps:
       # See https://github.com/actions/runner/issues/801#issuecomment-1374967227.
@@ -115,7 +115,7 @@ jobs:
             ubuntu-latest,
             windows-latest,
           ]
-        ocaml_compiler: [4.14.0]
+        ocaml_compiler: [4.14.1]
 
     runs-on: ${{matrix.os}}
 
@@ -147,7 +147,7 @@ jobs:
           chmod +x _build/install/default/bin/*
 
       - name: Use OCaml ${{matrix.ocaml_compiler}}
-        uses: ocaml/setup-ocaml@v2.1.7
+        uses: ocaml/setup-ocaml@v2
         if: matrix.os != 'windows-latest'
         with:
           ocaml-compiler: ${{matrix.ocaml_compiler}}
@@ -155,7 +155,7 @@ jobs:
           opam-depext: false
 
       - name: Use OCaml ${{matrix.ocaml_compiler}} (Win)
-        uses: ocaml/setup-ocaml@v2.1.7
+        uses: ocaml/setup-ocaml@v2
         if: matrix.os == 'windows-latest'
         with:
           ocaml-compiler: ${{matrix.ocaml_compiler}}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index a5b8b25b4f..86b73e7b2d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,14 @@
 
 # 12.0.0-alpha.1 (Unreleased)
 
+#### :bug: Bug Fix
+
+- Fix issue with async and newtype in uncurried mode. https://github.com/rescript-lang/rescript-compiler/pull/6601
+
+#### :house: Internal
+
+- Use OCaml 4.14.1 (+ Alpine 3.19 container) for CI build. https://github.com/rescript-lang/rescript-compiler/pull/6600
+
 # 11.1.0-rc.1
 
 #### :rocket: New Feature
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 56a9d7391a..dda45b2ba1 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -41,7 +41,7 @@ Make sure you have [opam](https://opam.ocaml.org/doc/Install.html) installed on
 opam init
 
 # Any recent OCaml version works as a development compiler
-opam switch create 4.14.0 # can also create local switch with opam switch create . 4.14.0
+opam switch create 4.14.1 # can also create local switch with opam switch create . 4.14.1
 
 # Install dev dependencies from OPAM
 opam install . --deps-only
diff --git a/jscomp/ml/ast_async.ml b/jscomp/ml/ast_async.ml
index d16b193a4c..b1552cd9a2 100644
--- a/jscomp/ml/ast_async.ml
+++ b/jscomp/ml/ast_async.ml
@@ -13,12 +13,18 @@ let add_promise_type ?(loc = Location.none) ~async
 
 let add_async_attribute ~async (body : Parsetree.expression) =
   if async then
-    {
-      body with
-      pexp_attributes =
-        ({txt = "res.async"; loc = Location.none}, PStr [])
-        :: body.pexp_attributes;
-    }
+   (   
+      match body.pexp_desc with
+      | Pexp_construct (x, Some e) when Ast_uncurried.exprIsUncurriedFun body ->
+        {body with pexp_desc = Pexp_construct (x, Some {e  with pexp_attributes =
+        ({txt = "res.async"; loc = Location.none}, PStr []) :: e.pexp_attributes} )}
+      | _ ->
+        {
+          body with
+          pexp_attributes =
+            ({txt = "res.async"; loc = Location.none}, PStr [])
+            :: body.pexp_attributes;
+        })
   else body
 
 let rec add_promise_to_result ~loc (e : Parsetree.expression) =
diff --git a/jscomp/test/async_await.js b/jscomp/test/async_await.js
index 0c674d3b90..d376f50acf 100644
--- a/jscomp/test/async_await.js
+++ b/jscomp/test/async_await.js
@@ -34,6 +34,10 @@ var toplevelAwait = await topFoo();
 
 var toplevelAwait2 = Caml_array.get(arr, await topFoo());
 
+async function f(value) {
+  return await Promise.resolve(1);
+}
+
 exports.next = next;
 exports.useNext = useNext;
 exports.Make = Make;
@@ -41,4 +45,5 @@ exports.topFoo = topFoo;
 exports.arr = arr;
 exports.toplevelAwait = toplevelAwait;
 exports.toplevelAwait2 = toplevelAwait2;
+exports.f = f;
 /* toplevelAwait Not a pure module */
diff --git a/jscomp/test/async_await.res b/jscomp/test/async_await.res
index fd7bf92f34..85aafb08bd 100644
--- a/jscomp/test/async_await.res
+++ b/jscomp/test/async_await.res
@@ -16,3 +16,7 @@ let arr = [1, 2, 3]
 
 let toplevelAwait = await topFoo()
 let toplevelAwait2 = arr[await topFoo()]
+
+let f = async (type input, value: input) => {
+  await Js.Promise.resolve(. 1)
+}
\ No newline at end of file