diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c7c883c..f8b6319 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -91,7 +91,7 @@ jobs:
         # JavaToolchainService (for -I$jdkHome/include -> jni.h), so a JRE would not do.
 
       - name: Set up Gradle (with dependency + build cache)
-        uses: gradle/actions/setup-gradle@9c971963bec38e04b3d30dcc455b5382be2fdbfb # v6.3.0
+        uses: gradle/actions/setup-gradle@3f5f9adaf7d9fecd50b5935e54106014257a94e6 # v6.4.0
         with:
           # Defense in depth on top of the SHA pin above: even a compromised action running
           # under this exact pinned commit could still try to poison the Gradle
@@ -227,7 +227,7 @@ jobs:
           java-version: '21'
 
       - name: Set up Gradle (with dependency + build cache)
-        uses: gradle/actions/setup-gradle@9c971963bec38e04b3d30dcc455b5382be2fdbfb # v6.3.0
+        uses: gradle/actions/setup-gradle@3f5f9adaf7d9fecd50b5935e54106014257a94e6 # v6.4.0
         with:
           # See the identical comment on job 'build''s setup-gradle step: defense in depth
           # against cache poisoning surviving beyond a single (even correctly SHA-pinned)