diff --git a/.github/actions/setup-rust-kache/action.yml b/.github/actions/setup-rust-kache/action.yml
index e32d82b..48f48e9 100644
--- a/.github/actions/setup-rust-kache/action.yml
+++ b/.github/actions/setup-rust-kache/action.yml
@@ -73,7 +73,7 @@ runs:
         components: ${{ inputs.components }}
         targets: ${{ inputs.targets }}
 
-    # Pinned exactly. The private fleet and hosted CI share the 0.13.0 S3
+    # Pinned exactly. The private fleet and hosted CI share the 0.15.1 S3
     # object layout and daemon protocol. Floating this version could split cache
     # epochs or layouts without an obvious workflow failure. Bump deliberately,
     # never via tag drift.
@@ -81,7 +81,7 @@ runs:
       if: inputs.enable-cache == 'true' && runner.os == 'Linux'
       shell: bash
       env:
-        KACHE_VERSION: "0.13.0"
+        KACHE_VERSION: "0.15.1"
       run: |
         set -euo pipefail
         # Reuse any already-installed binary at the pinned version. Persistent