diff --git a/CHANGELOG.md b/CHANGELOG.md
index efcd681611..2693e3de7f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,9 @@
 
 # 11.0.0-beta.1 (Unreleased)
 
+#### :rocket: Main New Feature
+- Make uncurried mode opt-out: by default, every project is now in uncurried mode, unless `"uncurried": false` is specified in the project config. https://github.com/rescript-lang/rescript-compiler/pull/6249
+
 # 11.0.0-alpha.6
 
 #### :boom: Breaking Change
diff --git a/jscomp/bsb/bsb_config_parse.ml b/jscomp/bsb/bsb_config_parse.ml
index 2ea53deb4c..0ef2c2da33 100644
--- a/jscomp/bsb/bsb_config_parse.ml
+++ b/jscomp/bsb/bsb_config_parse.ml
@@ -97,7 +97,7 @@ let extract_gentype_config (map : json_map) : Bsb_config_types.gentype_config =
 
 let extract_uncurried (map : json_map) : bool =
   match map.?(Bsb_build_schemas.uncurried) with
-  | None -> false
+  | None -> true
   | Some (True _) -> true
   | Some (False _) -> false
   | Some config ->
diff --git a/jscomp/build_tests/react_ppx/src/gpr_3987_test.bs.js b/jscomp/build_tests/react_ppx/src/gpr_3987_test.bs.js
index 3a70b78ea1..9144226068 100644
--- a/jscomp/build_tests/react_ppx/src/gpr_3987_test.bs.js
+++ b/jscomp/build_tests/react_ppx/src/gpr_3987_test.bs.js
@@ -1,20 +1,19 @@
 // Generated by ReScript, PLEASE EDIT WITH CARE
 'use strict';
 
-var Curry = require("rescript/lib/js/curry.js");
 var React = require("react");
 
 function makeContainer(text) {
-  var container = Curry._1(document.createElement, "div");
+  var container = document.createElement("div");
   container.className = "container";
-  var title = Curry._1(document.createElement, "div");
+  var title = document.createElement("div");
   title.className = "containerTitle";
   title.innerText = text;
-  var content = Curry._1(document.createElement, "div");
+  var content = document.createElement("div");
   content.className = "containerContent";
-  Curry._1(container.appendChild, title);
-  Curry._1(container.appendChild, content);
-  Curry._1(document.body.appendChild, container);
+  container.appendChild(title);
+  container.appendChild(content);
+  document.body.appendChild(container);
   return content;
 }
 
diff --git a/jscomp/build_tests/react_ppx/src/recursive_component_test.bs.js b/jscomp/build_tests/react_ppx/src/recursive_component_test.bs.js
index b34928e920..860ce62165 100644
--- a/jscomp/build_tests/react_ppx/src/recursive_component_test.bs.js
+++ b/jscomp/build_tests/react_ppx/src/recursive_component_test.bs.js
@@ -1,7 +1,6 @@
 // Generated by ReScript, PLEASE EDIT WITH CARE
 'use strict';
 
-var Curry = require("rescript/lib/js/curry.js");
 var React = require("react");
 
 function make(Props) {
@@ -12,7 +11,7 @@ function make(Props) {
 }
 
 function mm(x) {
-  return Curry._1(make$1, {
+  return make$1({
               b: !x.b
             });
 }
diff --git a/jscomp/syntax/src/res_multi_printer.ml b/jscomp/syntax/src/res_multi_printer.ml
index 551ab5bbf3..d419db1c8b 100644
--- a/jscomp/syntax/src/res_multi_printer.ml
+++ b/jscomp/syntax/src/res_multi_printer.ml
@@ -1,7 +1,7 @@
 let defaultPrintWidth = 100
 
 (* Determine if the file is in uncurried mode by looking for
-   the fist ancestor .bsconfig and see if it contains "uncurried": true *)
+   the fist ancestor .bsconfig and see if it contains "uncurried": false *)
 let getUncurriedFromBsconfig ~filename =
   let rec findBsconfig ~dir =
     let bsconfig = Filename.concat dir "bsconfig.json" in
@@ -42,18 +42,19 @@ let getUncurriedFromBsconfig ~filename =
       lines
       |> List.exists (fun line ->
              let uncurried = ref false in
-             let true_ = ref false in
+             let false_ = ref false in
              let words = line |> String.split_on_char ' ' in
              words
              |> List.iter (fun word ->
                     match word with
                     | "\"uncurried\"" | "\"uncurried\":" -> uncurried := true
-                    | "\"uncurried\":true" | "\"uncurried\":true," ->
+                    | "\"uncurried\":false" | "\"uncurried\":false," ->
                       uncurried := true;
-                      true_ := true
-                    | "true" | ":true" | "true," | ":true," -> true_ := true
+                      false_ := true
+                    | "false" | ":false" | "false," | ":false," ->
+                      false_ := true
                     | _ -> ());
-             !uncurried && !true_)
+             not (!uncurried && !false_))
     in
     if uncurried then Config.uncurried := Uncurried