diff --git a/CHANGELOG.md b/CHANGELOG.md
index d34ca40bba..1389c93868 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,7 +10,7 @@
 > - :nail_care: [Polish]
 > - :house: [Internal]
 
-# 13.0.0 (Unreleased)
+# 13.0.0-alpha.1 (Unreleased)
 
 #### :boom: Breaking Change
 
diff --git a/compiler/common/bs_version.ml b/compiler/common/bs_version.ml
index 8b7b46c106..0a76a26d44 100644
--- a/compiler/common/bs_version.ml
+++ b/compiler/common/bs_version.ml
@@ -21,5 +21,5 @@
  * You should have received a copy of the GNU Lesser General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *)
-let version = "13.0.0"
+let version = "13.0.0-alpha.1"
 let header = "// Generated by ReScript, PLEASE EDIT WITH CARE"
diff --git a/package.json b/package.json
index 9c23832f27..b0c9dd25b3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "rescript",
-  "version": "13.0.0",
+  "version": "13.0.0-alpha.1",
   "description": "ReScript toolchain",
   "type": "module",
   "keywords": [
diff --git a/packages/@rescript/darwin-arm64/package.json b/packages/@rescript/darwin-arm64/package.json
index 1e033e84a3..c848f1650d 100644
--- a/packages/@rescript/darwin-arm64/package.json
+++ b/packages/@rescript/darwin-arm64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@rescript/darwin-arm64",
-  "version": "13.0.0",
+  "version": "13.0.0-alpha.1",
   "description": "ReScript binaries for MacOS ARM64",
   "type": "module",
   "homepage": "https://rescript-lang.org",
diff --git a/packages/@rescript/darwin-x64/package.json b/packages/@rescript/darwin-x64/package.json
index 53fb53fabb..813fb77879 100644
--- a/packages/@rescript/darwin-x64/package.json
+++ b/packages/@rescript/darwin-x64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@rescript/darwin-x64",
-  "version": "13.0.0",
+  "version": "13.0.0-alpha.1",
   "description": "ReScript binaries for MacOS x86_64",
   "type": "module",
   "homepage": "https://rescript-lang.org",
diff --git a/packages/@rescript/linux-arm64/package.json b/packages/@rescript/linux-arm64/package.json
index ec7f0fdc54..6aca498b1a 100644
--- a/packages/@rescript/linux-arm64/package.json
+++ b/packages/@rescript/linux-arm64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@rescript/linux-arm64",
-  "version": "13.0.0",
+  "version": "13.0.0-alpha.1",
   "description": "ReScript binaries for Linux ARM64",
   "type": "module",
   "homepage": "https://rescript-lang.org",
diff --git a/packages/@rescript/linux-x64/package.json b/packages/@rescript/linux-x64/package.json
index 8354e3d33d..212b83a861 100644
--- a/packages/@rescript/linux-x64/package.json
+++ b/packages/@rescript/linux-x64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@rescript/linux-x64",
-  "version": "13.0.0",
+  "version": "13.0.0-alpha.1",
   "description": "ReScript binaries for Linux x86_64",
   "type": "module",
   "homepage": "https://rescript-lang.org",
diff --git a/packages/@rescript/runtime/package.json b/packages/@rescript/runtime/package.json
index 7e0d01d9cd..53ad157af4 100644
--- a/packages/@rescript/runtime/package.json
+++ b/packages/@rescript/runtime/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@rescript/runtime",
-  "version": "13.0.0",
+  "version": "13.0.0-alpha.1",
   "description": "ReScript runtime modules",
   "type": "module",
   "homepage": "https://rescript-lang.org",
diff --git a/packages/@rescript/win32-x64/package.json b/packages/@rescript/win32-x64/package.json
index f6e93386fd..835501f3f8 100644
--- a/packages/@rescript/win32-x64/package.json
+++ b/packages/@rescript/win32-x64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@rescript/win32-x64",
-  "version": "13.0.0",
+  "version": "13.0.0-alpha.1",
   "description": "ReScript binaries for Windows x86_64",
   "type": "module",
   "homepage": "https://rescript-lang.org",
diff --git a/rewatch/Cargo.lock b/rewatch/Cargo.lock
index 5830a0b419..6bad6f3c18 100644
--- a/rewatch/Cargo.lock
+++ b/rewatch/Cargo.lock
@@ -768,7 +768,7 @@ checksum = "2b15c43186be67a4fd63bee50d0303afffcef381492ebe2c5d87f324e1b8815c"
 
 [[package]]
 name = "rescript"
-version = "13.0.0"
+version = "13.0.0-alpha.1"
 dependencies = [
  "ahash",
  "anyhow",
diff --git a/rewatch/Cargo.toml b/rewatch/Cargo.toml
index 6cf742e58f..6e24ce85f4 100644
--- a/rewatch/Cargo.toml
+++ b/rewatch/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rescript"
-version = "13.0.0"
+version = "13.0.0-alpha.1"
 edition = "2024"
 rust-version = "1.91"
 
diff --git a/tests/dependencies/rescript-react/package.json b/tests/dependencies/rescript-react/package.json
index a6dac14671..29d1472e4d 100644
--- a/tests/dependencies/rescript-react/package.json
+++ b/tests/dependencies/rescript-react/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@rescript/react",
   "private": true,
-  "version": "13.0.0",
+  "version": "13.0.0-alpha.1",
   "homepage": "https://rescript-lang.org",
   "bugs": "https://github.com/rescript-lang/rescript/issues",
   "repository": {
diff --git a/yarn.config.cjs b/yarn.config.cjs
index bf224c69dd..b7ae38aeab 100644
--- a/yarn.config.cjs
+++ b/yarn.config.cjs
@@ -14,7 +14,7 @@ const execPromise = util.promisify(exec);
  * @param {Yarn.Constraints.Context} ctx
  */
 async function enforceCompilerMeta({ Yarn }) {
-  const EXPECTED_VERSION = "13.0.0";
+  const EXPECTED_VERSION = "13.0.0-alpha.1";
 
   for (const workspace of Yarn.workspaces()) {
     const { ident } = workspace.pkg;