diff --git a/.github/workflows/proof-corpus.yml b/.github/workflows/proof-corpus.yml
index be9c620..1664013 100644
--- a/.github/workflows/proof-corpus.yml
+++ b/.github/workflows/proof-corpus.yml
@@ -32,7 +32,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
       # Idris2 0.8.0 from PINNED official source (tag v0.8.0 == this commit).
       # No maintained setup action exists; a SHA-pinned source build is