diff --git a/CHANGELOG.md b/CHANGELOG.md
index d4cfd439de..101f1d4469 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -28,6 +28,10 @@
 - Fix printing of exotic JSX names https://github.com/rescript-lang/rescript-compiler/pull/6451
 - Fix locations when code with `await` fails to compile (all locations would point to the internal function `unsafe_await`) https://github.com/rescript-lang/rescript-compiler/pull/6452
 
+#### :house: Internal
+
+- Remove dependency stdlib-406 -> belt. https://github.com/rescript-lang/rescript-compiler/pull/6453
+
 #### :nail_care: Polish
 
 - Add [`Deno`](https://deno.land/api?s=Deno) to reserved names, so that modules named `Deno` don't clash with the globally exposed `Deno` object. https://github.com/rescript-lang/rescript-compiler/pull/6428
diff --git a/jscomp/stdlib-406/release.ninja b/jscomp/stdlib-406/release.ninja
index 7356eb45ba..992f90f652 100644
--- a/jscomp/stdlib-406/release.ninja
+++ b/jscomp/stdlib-406/release.ninja
@@ -81,9 +81,9 @@ o stdlib-406/stdLabels.cmj : cc_cmi stdlib-406/stdLabels.res | stdlib-406/arrayL
 o stdlib-406/stdLabels.cmi : cc stdlib-406/stdLabels.resi | stdlib-406/arrayLabels.cmi stdlib-406/bytesLabels.cmi stdlib-406/listLabels.cmi stdlib-406/pervasives.cmj stdlib-406/stringLabels.cmi $bsc others
 o stdlib-406/stream.cmj : cc_cmi stdlib-406/stream.res | stdlib-406/bytes.cmj stdlib-406/lazy.cmj stdlib-406/list.cmj stdlib-406/stream.cmi stdlib-406/string.cmj $bsc others
 o stdlib-406/stream.cmi : cc stdlib-406/stream.resi | stdlib-406/pervasives.cmj $bsc others
-o stdlib-406/string.cmj : cc_cmi stdlib-406/string.res | stdlib-406/bytes.cmj stdlib-406/string.cmi $bsc others
+o stdlib-406/string.cmj : cc_cmi stdlib-406/string.res | stdlib-406/array.cmj stdlib-406/bytes.cmj stdlib-406/string.cmi $bsc others
 o stdlib-406/string.cmi : cc stdlib-406/string.resi | stdlib-406/pervasives.cmj $bsc others
-o stdlib-406/stringLabels.cmj : cc_cmi stdlib-406/stringLabels.res | stdlib-406/bytes.cmj stdlib-406/stringLabels.cmi $bsc others
+o stdlib-406/stringLabels.cmj : cc_cmi stdlib-406/stringLabels.res | stdlib-406/array.cmj stdlib-406/bytes.cmj stdlib-406/stringLabels.cmi $bsc others
 o stdlib-406/stringLabels.cmi : cc stdlib-406/stringLabels.resi | stdlib-406/pervasives.cmj $bsc others
 o stdlib-406/sys.cmj : cc_cmi stdlib-406/sys.res | stdlib-406/sys.cmi $bsc others
 o stdlib-406/sys.cmi : cc stdlib-406/sys.resi | stdlib-406/pervasives.cmj $bsc others
diff --git a/jscomp/stdlib-406/string.res b/jscomp/stdlib-406/string.res
index 91ad85a2b3..a038bfdaf8 100644
--- a/jscomp/stdlib-406/string.res
+++ b/jscomp/stdlib-406/string.res
@@ -38,7 +38,7 @@ let blit = B.blit_string
 
 %%private(@send external join: (array<string>, string) => string = "join")
 
-let concat = (sep: string, xs: list<string>) => xs->Belt_List.toArray->join(sep)
+let concat = (sep: string, xs: list<string>) => xs->Array.of_list->join(sep)
 
 /* duplicated in bytes.ml */
 let iter = (f, s) =>
diff --git a/jscomp/stdlib-406/stringLabels.res b/jscomp/stdlib-406/stringLabels.res
index 869286af09..a9ea486d14 100644
--- a/jscomp/stdlib-406/stringLabels.res
+++ b/jscomp/stdlib-406/stringLabels.res
@@ -38,7 +38,7 @@ let blit = (~src, ~src_pos, ~dst, ~dst_pos, ~len) => B.blit_string(src, src_pos,
 
 %%private(@send external join: (array<string>, string) => string = "join")
 
-let concat = (~sep: string, xs: list<string>) => xs->Belt_List.toArray->join(sep)
+let concat = (~sep: string, xs: list<string>) => xs->Array.of_list->join(sep)
 
 /* duplicated in bytes.ml */
 let iter = (~f, s) =>
diff --git a/jscomp/test/ext_filename_test.js b/jscomp/test/ext_filename_test.js
index ac159c6afe..65c301b886 100644
--- a/jscomp/test/ext_filename_test.js
+++ b/jscomp/test/ext_filename_test.js
@@ -3,11 +3,11 @@
 
 var Sys = require("../../lib/js/sys.js");
 var List = require("../../lib/js/list.js");
+var $$Array = require("../../lib/js/array.js");
 var Bytes = require("../../lib/js/bytes.js");
 var Curry = require("../../lib/js/curry.js");
 var Caml_sys = require("../../lib/js/caml_sys.js");
 var Filename = require("../../lib/js/filename.js");
-var Belt_List = require("../../lib/js/belt_List.js");
 var Pervasives = require("../../lib/js/pervasives.js");
 var Test_literals = require("./test_literals.js");
 var Ext_string_test = require("./ext_string_test.js");
@@ -115,19 +115,19 @@ function relative_path(file_or_dir_1, file_or_dir_2) {
   var ys = go(dir1, dir2);
   if (ys) {
     if (ys.hd === node_parent) {
-      return Belt_List.toArray(ys).join(node_sep);
+      return $$Array.of_list(ys).join(node_sep);
     }
     var xs = {
       hd: node_current,
       tl: ys
     };
-    return Belt_List.toArray(xs).join(node_sep);
+    return $$Array.of_list(xs).join(node_sep);
   }
   var xs$1 = {
     hd: node_current,
     tl: ys
   };
-  return Belt_List.toArray(xs$1).join(node_sep);
+  return $$Array.of_list(xs$1).join(node_sep);
 }
 
 function node_relative_path(node_modules_shorten, file1, dep_file) {
diff --git a/jscomp/test/string_test.js b/jscomp/test/string_test.js
index a759643507..2744674448 100644
--- a/jscomp/test/string_test.js
+++ b/jscomp/test/string_test.js
@@ -3,9 +3,9 @@
 
 var Mt = require("./mt.js");
 var List = require("../../lib/js/list.js");
+var $$Array = require("../../lib/js/array.js");
 var Bytes = require("../../lib/js/bytes.js");
 var $$String = require("../../lib/js/string.js");
-var Belt_List = require("../../lib/js/belt_List.js");
 var Ext_string_test = require("./ext_string_test.js");
 var Caml_js_exceptions = require("../../lib/js/caml_js_exceptions.js");
 
@@ -131,7 +131,7 @@ function string_of_chars(x) {
   var xs = List.map((function (prim) {
           return String.fromCharCode(prim);
         }), x);
-  return Belt_List.toArray(xs).join("");
+  return $$Array.of_list(xs).join("");
 }
 
 Mt.from_pair_suites("String_test", {
diff --git a/lib/es6/string.js b/lib/es6/string.js
index c9fc3629b3..def3e31195 100644
--- a/lib/es6/string.js
+++ b/lib/es6/string.js
@@ -1,9 +1,9 @@
 
 
 import * as Caml from "./caml.js";
+import * as $$Array from "./array.js";
 import * as Bytes from "./bytes.js";
 import * as Curry from "./curry.js";
-import * as Belt_List from "./belt_List.js";
 import * as Caml_string from "./caml_string.js";
 import * as Caml_js_exceptions from "./caml_js_exceptions.js";
 
@@ -16,7 +16,7 @@ function sub(s, ofs, len) {
 }
 
 function concat(sep, xs) {
-  return Belt_List.toArray(xs).join(sep);
+  return $$Array.of_list(xs).join(sep);
 }
 
 function iter(f, s) {
diff --git a/lib/es6/stringLabels.js b/lib/es6/stringLabels.js
index e1263d5582..4b568b4ebc 100644
--- a/lib/es6/stringLabels.js
+++ b/lib/es6/stringLabels.js
@@ -1,9 +1,9 @@
 
 
 import * as Caml from "./caml.js";
+import * as $$Array from "./array.js";
 import * as Bytes from "./bytes.js";
 import * as Curry from "./curry.js";
-import * as Belt_List from "./belt_List.js";
 import * as Caml_string from "./caml_string.js";
 import * as Caml_js_exceptions from "./caml_js_exceptions.js";
 
@@ -18,7 +18,7 @@ function sub(s, ofs, len) {
 var blit = Bytes.blit_string;
 
 function concat(sep, xs) {
-  return Belt_List.toArray(xs).join(sep);
+  return $$Array.of_list(xs).join(sep);
 }
 
 function iter(f, s) {
diff --git a/lib/js/string.js b/lib/js/string.js
index abbb4077c3..076b21a317 100644
--- a/lib/js/string.js
+++ b/lib/js/string.js
@@ -1,9 +1,9 @@
 'use strict';
 
 var Caml = require("./caml.js");
+var $$Array = require("./array.js");
 var Bytes = require("./bytes.js");
 var Curry = require("./curry.js");
-var Belt_List = require("./belt_List.js");
 var Caml_string = require("./caml_string.js");
 var Caml_js_exceptions = require("./caml_js_exceptions.js");
 
@@ -16,7 +16,7 @@ function sub(s, ofs, len) {
 }
 
 function concat(sep, xs) {
-  return Belt_List.toArray(xs).join(sep);
+  return $$Array.of_list(xs).join(sep);
 }
 
 function iter(f, s) {
diff --git a/lib/js/stringLabels.js b/lib/js/stringLabels.js
index bcdea0561a..22cd4df919 100644
--- a/lib/js/stringLabels.js
+++ b/lib/js/stringLabels.js
@@ -1,9 +1,9 @@
 'use strict';
 
 var Caml = require("./caml.js");
+var $$Array = require("./array.js");
 var Bytes = require("./bytes.js");
 var Curry = require("./curry.js");
-var Belt_List = require("./belt_List.js");
 var Caml_string = require("./caml_string.js");
 var Caml_js_exceptions = require("./caml_js_exceptions.js");
 
@@ -18,7 +18,7 @@ function sub(s, ofs, len) {
 var blit = Bytes.blit_string;
 
 function concat(sep, xs) {
-  return Belt_List.toArray(xs).join(sep);
+  return $$Array.of_list(xs).join(sep);
 }
 
 function iter(f, s) {