diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6d408b7770..9aca954912 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -29,6 +29,7 @@
 
 #### :boom: Breaking Change
 - Add smart printer for pipe-chains.  https://github.com/rescript-lang/rescript-compiler/pull/6411 (the formatter will reformat existing code in certain cases)
+- `Js.Json.t` now uses `Boolean(bool)` instead of explicit `@as(true) True | @as(false) False`. https://github.com/rescript-lang/rescript-compiler/pull/6421
 
 #### :nail_care: Polish
 
diff --git a/jscomp/others/js_json.res b/jscomp/others/js_json.res
index 22a117ecce..ccfa6de9f7 100644
--- a/jscomp/others/js_json.res
+++ b/jscomp/others/js_json.res
@@ -26,8 +26,7 @@
 
 @unboxed
 type rec t =
-  | @as(false) False
-  | @as(true) True
+  | Boolean(bool)
   | @as(null) Null
   | String(string)
   | Number(float)
diff --git a/jscomp/others/js_json.resi b/jscomp/others/js_json.resi
index 3063bc90ff..fad033bf14 100644
--- a/jscomp/others/js_json.resi
+++ b/jscomp/others/js_json.resi
@@ -32,8 +32,7 @@
 
 @unboxed /** The JSON data structure */
 type rec t =
-  | @as(false) False
-  | @as(true) True
+  | Boolean(bool)
   | @as(null) Null
   | String(string)
   | Number(float)