diff --git a/.github/workflows/full-suite.yml b/.github/workflows/full-suite.yml
index 38a14eae2c..f19ea465cb 100644
--- a/.github/workflows/full-suite.yml
+++ b/.github/workflows/full-suite.yml
@@ -93,7 +93,7 @@ jobs:
 
       - name: Cache built dist artifacts
         id: dist-cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: |
             packages/core/dist
@@ -173,7 +173,7 @@ jobs:
 
       - name: Cache built dist artifacts
         id: dist-cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: |
             packages/core/dist
@@ -282,7 +282,7 @@ jobs:
 
       - name: Cache built dist artifacts (incremental)
         id: dist-cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: |
             packages/core/dist
@@ -311,7 +311,7 @@ jobs:
       # pr-checks.yml. Restored buildinfo is self-validating — tsc re-checks
       # anything that changed — so restore-keys is correctness-neutral.
       - name: Cache TypeScript incremental buildinfo
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: |
             packages/*/dist/.tsbuildinfo
diff --git a/.github/workflows/mobile.yml b/.github/workflows/mobile.yml
index 091cf431ca..126771f1ec 100644
--- a/.github/workflows/mobile.yml
+++ b/.github/workflows/mobile.yml
@@ -39,7 +39,7 @@ jobs:
         uses: ./.github/actions/setup-node-pnpm
 
       - name: Cache iOS DerivedData
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: ~/Library/Developer/Xcode/DerivedData
           key: ${{ runner.os }}-derived-data-${{ hashFiles('packages/mobile/**', 'pnpm-lock.yaml') }}
@@ -120,7 +120,7 @@ jobs:
           java-version: "21"
 
       - name: Cache Android Gradle caches
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: ~/.gradle/caches
           key: ${{ runner.os }}-gradle-${{ hashFiles('packages/mobile/android/**/*.gradle*', 'packages/mobile/android/**/gradle-wrapper.properties') }}
diff --git a/.github/workflows/pr-checks.yml b/.github/workflows/pr-checks.yml
index 44fd7ef568..d3bb37b708 100644
--- a/.github/workflows/pr-checks.yml
+++ b/.github/workflows/pr-checks.yml
@@ -72,7 +72,7 @@ jobs:
       # warm-gate-build-cache job in full-suite.yml, which must keep an
       # identical path list — actions/cache versions caches by path list).
       - name: Cache TypeScript incremental buildinfo
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: |
             packages/*/dist/.tsbuildinfo
@@ -112,7 +112,7 @@ jobs:
         run: echo "hash=$(node scripts/ensure-test-artifacts.mjs --print-source-hash)" >> "$GITHUB_OUTPUT"
 
       - name: Restore built dist artifacts (incremental, restore-only)
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v6
         with:
           path: |
             packages/core/dist
@@ -200,7 +200,7 @@ jobs:
 
       - name: Cache built dist artifacts (incremental)
         id: dist-cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: |
             packages/core/dist
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index d3c3fadbb5..19c20080b8 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -480,7 +480,7 @@ jobs:
           java-version: "21"
 
       - name: Cache Android Gradle caches
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: |
             ~/.gradle/caches
diff --git a/.github/workflows/test-release.yml b/.github/workflows/test-release.yml
index 236ad45e2d..6d0b42f576 100644
--- a/.github/workflows/test-release.yml
+++ b/.github/workflows/test-release.yml
@@ -403,7 +403,7 @@ jobs:
           java-version: "21"
 
       - name: Cache Android Gradle caches
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: |
             ~/.gradle/caches