diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3d8d088f1f..95de0280cf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@
 # 11.1.5 (Unreleased)
 
 - Deprecate JSX 3 https://github.com/rescript-lang/rescript-compiler/pull/7042
+- Deprecate js_cast.res https://github.com/rescript-lang/rescript-compiler/pull/7074
 
 # 11.1.4
 
diff --git a/jscomp/others/js_cast.res b/jscomp/others/js_cast.res
index 07135415d9..01916604b8 100644
--- a/jscomp/others/js_cast.res
+++ b/jscomp/others/js_cast.res
@@ -22,6 +22,8 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
 
+@@deprecated("This module is not supported anymore and will be removed in the next major version.")
+
 external intOfBool: bool => int = "%identity"
 
 external floatOfInt: int => float = "%identity"
diff --git a/jscomp/others/js_cast.resi b/jscomp/others/js_cast.resi
index 8ef323b732..95afe01f09 100644
--- a/jscomp/others/js_cast.resi
+++ b/jscomp/others/js_cast.resi
@@ -37,6 +37,8 @@ If for any reason, the runtime representation changes, those function
 will be modified accordingly.
 */
 
+@@deprecated("This module is not supported anymore and will be removed in the next major version.")
+
 /**
 `intOfBool(b)` returns `1` for when `b` is `true` and `0` when `b` is `false`
 */