diff --git a/README.md b/README.md
index 337f7be..ba5804d 100644
--- a/README.md
+++ b/README.md
@@ -51,7 +51,7 @@ jobs:
     steps:
       - uses: actions/checkout@v7.0.0
       - uses: DeterminateSystems/determinate-nix-action@v3
-      - uses: DeterminateSystems/flakehub-cache-action@v3 # or v3.21.2 to pin to a release
+      - uses: DeterminateSystems/flakehub-cache-action@v3 # or v3.21.5 to pin to a release
       - run: nix build .
 ```
 
@@ -65,7 +65,7 @@ jobs:
 Unlike `DeterminateSystems/magic-nix-cache-action`, we fully support explicit version pinning for maximum consistency.
 This Action is **automatically tagged** for every release, giving you complete control over your CI environment:
 
-📍 Pinning to `DeterminateSystems/flakehub-cache-action@v3.21.2` guarantees:
+📍 Pinning to `DeterminateSystems/flakehub-cache-action@v3.21.5` guarantees:
 
 - Same `flakehub-cache-action` revision every time
 - Reproducible CI workflows, even years later
diff --git a/flake.lock b/flake.lock
index 500a957..451e1e0 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,12 +2,12 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1781577229,
-        "narHash": "sha256-lrp67w8AulE9Ks53n27I45ADSzbOCn4H+CNW1Ck8B+8=",
-        "rev": "567a49d1913ce81ac6e9582e3553dd90a955875f",
-        "revCount": 1017464,
+        "lastModified": 1783224372,
+        "narHash": "sha256-8i/87eeoqiGE4yOTjwSA3Eh/ziJRQEmd/unYU+K27sk=",
+        "rev": "d407951447dcd00442e97087bf374aad70c04cea",
+        "revCount": 1027867,
         "type": "tarball",
-        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.1017464%2Brev-567a49d1913ce81ac6e9582e3553dd90a955875f/019ed27e-44b2-7462-b1ef-3564aa6c28ee/source.tar.gz"
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.1027867%2Brev-d407951447dcd00442e97087bf374aad70c04cea/019f32d6-f801-7201-b6cb-59773d7eec95/source.tar.gz"
       },
       "original": {
         "type": "tarball",
diff --git a/tools/state.json b/tools/state.json
index 86abdb1..31a5f8e 100644
--- a/tools/state.json
+++ b/tools/state.json
@@ -1,6 +1,6 @@
 {
   "upstream_action_revision": "76aaf8814cdb385b86597c32b8c51b66b69b0839",
-  "self_version": "v3.21.2",
+  "self_version": "v3.21.5",
   "binary_revision": "03659f4394aec2317771e29041ef266669e2ee12",
   "checkout_action_tag": "v7.0.0"
 }