diff --git a/.github/workflows/auto-close-duplicates.yml b/.github/workflows/auto-close-duplicates.yml
index b6ca0563f..7f67a057a 100644
--- a/.github/workflows/auto-close-duplicates.yml
+++ b/.github/workflows/auto-close-duplicates.yml
@@ -18,7 +18,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup Bun
-        uses: oven-sh/setup-bun@v2
+        uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0 (sha-pinned)
         with:
           bun-version: latest
 
diff --git a/.github/workflows/backfill-duplicate-comments.yml b/.github/workflows/backfill-duplicate-comments.yml
index acce8f908..16a39b977 100644
--- a/.github/workflows/backfill-duplicate-comments.yml
+++ b/.github/workflows/backfill-duplicate-comments.yml
@@ -32,7 +32,7 @@ jobs:
         uses: actions/checkout@v4
       
       - name: Setup Bun
-        uses: oven-sh/setup-bun@v2
+        uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0 (sha-pinned)
         with:
           bun-version: latest
       
diff --git a/.github/workflows/issue-lifecycle-comment.yml b/.github/workflows/issue-lifecycle-comment.yml
index 75b1a035f..1acffef2e 100644
--- a/.github/workflows/issue-lifecycle-comment.yml
+++ b/.github/workflows/issue-lifecycle-comment.yml
@@ -15,7 +15,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup Bun
-        uses: oven-sh/setup-bun@v2
+        uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0 (sha-pinned)
         with:
           bun-version: latest
 
diff --git a/.github/workflows/sweep.yml b/.github/workflows/sweep.yml
index e6023cbbb..345616b40 100644
--- a/.github/workflows/sweep.yml
+++ b/.github/workflows/sweep.yml
@@ -19,7 +19,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup Bun
-        uses: oven-sh/setup-bun@v2
+        uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0 (sha-pinned)
         with:
           bun-version: latest