diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ccb5bea5..e7e201bd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -32,7 +32,7 @@ jobs:
       # database - not something a CI runner has; see its own failure message:
       # "Run 'dotnet run -- --auth' from src/selftest to authenticate").
       - name: Restore NuGet cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           key: nuget-cache-${{ hashFiles('**/Directory.Packages.props', '**/*.csproj') }}
           path: ~/.nuget/packages
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 23fa922d..65872558 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -47,7 +47,7 @@ jobs:
       # ci.yml for why; CodeQL doesn't need the MAUI Windows target analyzed
       # separately from what the cross-platform library/test projects cover.
       - name: Restore NuGet cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           key: nuget-cache-${{ hashFiles('**/Directory.Packages.props', '**/*.csproj') }}
           path: ~/.nuget/packages
diff --git a/.github/workflows/release-installers.yml b/.github/workflows/release-installers.yml
index 9952716d..3314ac83 100644
--- a/.github/workflows/release-installers.yml
+++ b/.github/workflows/release-installers.yml
@@ -35,7 +35,7 @@ jobs:
         with:
           dotnet-version: 10.0.x
       - name: Restore NuGet cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           key: nuget-cache-${{ hashFiles('**/Directory.Packages.props', '**/*.csproj') }}
           path: ~/.nuget/packages