diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 658fd862749c..bfe174349582 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -503,11 +503,16 @@ jobs:
         if: github.event_name != 'pull_request'
 
   job_bun_unit_tests:
-    name: Bun Unit Tests
+    name: Bun (${{ matrix.bun }}) Unit Tests
     needs: [job_get_metadata, job_build]
     if: needs.job_build.outputs.changed_bun == 'true' || github.event_name != 'pull_request'
     timeout-minutes: 10
     runs-on: ubuntu-24.04
+    strategy:
+      fail-fast: false
+      matrix:
+        # 1.3.14 is the oldest supported Bun version
+        bun: ['1.3.14', '1.4']
     steps:
       - name: Check out current commit (${{ needs.job_get_metadata.outputs.commit_label }})
         uses: actions/checkout@v7
@@ -520,7 +525,7 @@ jobs:
       - name: Set up Bun
         uses: oven-sh/setup-bun@v2
         with:
-          bun-version: '1.3.14'
+          bun-version: ${{ matrix.bun }}
       - name: Restore caches
         uses: ./.github/actions/restore-cache
         with:
@@ -904,7 +909,7 @@ jobs:
         run: yarn test
 
   job_bun_integration_tests:
-    name: Bun Integration Tests (${{ matrix.shard }}/2)
+    name: Bun (${{ matrix.bun }}) Integration Tests (${{ matrix.shard }}/2)
     needs: [job_get_metadata, job_build]
     if: needs.job_build.outputs.changed_bun_integration == 'true' || github.event_name != 'pull_request'
     runs-on: ubuntu-24.04
@@ -912,6 +917,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
+        # 1.3.14 is the oldest supported Bun version
+        bun: ['1.3.14', '1.4']
         shard: [1, 2]
     steps:
       - name: Check out current commit (${{ needs.job_get_metadata.outputs.commit_label }})
@@ -925,7 +932,7 @@ jobs:
       - name: Set up Bun
         uses: oven-sh/setup-bun@v2
         with:
-          bun-version: '1.3.14'
+          bun-version: ${{ matrix.bun }}
       - name: Restore caches
         uses: ./.github/actions/restore-cache
         with:
diff --git a/MIGRATION.md b/MIGRATION.md
index 55be1d869f77..9785e86fd6a8 100644
--- a/MIGRATION.md
+++ b/MIGRATION.md
@@ -37,6 +37,8 @@ Version 11 of the Sentry SDK has new compatibility ranges for runtimes and frame
 
 **Deno:** The minimum supported Deno version is now **2.8.3**.
 
+**Bun:** The minimum supported Bun version is now **1.3.14**.
+
 **Browsers:** Support for **Safari 14** was dropped. Sentry now requires Safari 15 or higher. For the rest of the browser support matrix, refer to the [Sentry docs](https://docs.sentry.io/platforms/javascript/#browser-support).
 
 ### TypeScript Version Policy
diff --git a/packages/bun/package.json b/packages/bun/package.json
index 4953d3803e31..13a48fab0dc4 100644
--- a/packages/bun/package.json
+++ b/packages/bun/package.json
@@ -7,7 +7,8 @@
   "author": "Sentry",
   "license": "MIT",
   "engines": {
-    "node": ">=20.19.0 <22.0.0 || >=22.12.0 <23.0.0 || >=23.2.0"
+    "node": ">=20.19.0 <22.0.0 || >=22.12.0 <23.0.0 || >=23.2.0",
+    "bun": ">=1.3.14"
   },
   "files": [
     "/build"