diff --git a/.bun-version b/.bun-version
new file mode 100644
index 000000000..085c0f266
--- /dev/null
+++ b/.bun-version
@@ -0,0 +1 @@
+1.3.14
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 868b4b51a..a828fbe20 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,7 +28,7 @@ jobs:
           fetch-depth: 0
       - uses: oven-sh/setup-bun@v2
         with:
-          bun-version: latest
+          bun-version-file: .bun-version
       - uses: actions/cache@v4
         with:
           path: ~/.bun/install/cache
@@ -52,7 +52,7 @@ jobs:
           fetch-depth: 0
       - uses: oven-sh/setup-bun@v2
         with:
-          bun-version: latest
+          bun-version-file: .bun-version
       - uses: actions/cache@v4
         with:
           path: ~/.bun/install/cache
@@ -71,7 +71,7 @@ jobs:
           fetch-depth: 0
       - uses: oven-sh/setup-bun@v2
         with:
-          bun-version: latest
+          bun-version-file: .bun-version
       - uses: actions/cache@v4
         with:
           path: ~/.bun/install/cache
@@ -91,7 +91,7 @@ jobs:
           fetch-depth: 0
       - uses: oven-sh/setup-bun@v2
         with:
-          bun-version: latest
+          bun-version-file: .bun-version
       - uses: actions/cache@v4
         with:
           path: ~/.bun/install/cache
@@ -142,7 +142,7 @@ jobs:
           fetch-depth: 0
       - uses: oven-sh/setup-bun@v2
         with:
-          bun-version: latest
+          bun-version-file: .bun-version
       - uses: actions/cache@v4
         with:
           path: ~/.bun/install/cache
diff --git a/README.md b/README.md
index 62007603f..fa191b20a 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,8 @@ install is tracked separately and is not part of this path.
 
 ## Quickstart
 
-Requires [Bun](https://bun.sh) >= 1.2.
+Requires [Bun](https://bun.sh) >= 1.2. The exact version CI and this repo
+develop against is pinned in [`.bun-version`](.bun-version).
 
 ```sh
 bun install