diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 46473ac..01307d5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -69,7 +69,7 @@ jobs:
         # CMake handles incremental builds natively; restoring build/
         # cuts ~5 min off the cold MSVC pass when a PR touches only a
         # few files. Falls back to the most recent build on a hash miss.
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: build
           key: build-${{ runner.os }}-${{ hashFiles('**/CMakeLists.txt', 'core/src/**/*.cpp', 'core/src/**/*.h', 'modules/**/*.cpp', 'modules/**/*.h', 'modules/**/*.cs', '.gitmodules', 'version.txt') }}
@@ -77,7 +77,7 @@ jobs:
             build-${{ runner.os }}-
 
       - name: Cache NuGet packages
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ~/.nuget/packages
           key: nuget-${{ runner.os }}-${{ hashFiles('modules/facetracking/src/host/**/*.csproj', 'modules/facetracking/src/host/**/packages.lock.json') }}
@@ -85,7 +85,7 @@ jobs:
             nuget-${{ runner.os }}-
 
       - name: Cache NSIS install
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: 'C:\Program Files (x86)\NSIS'
           key: nsis-${{ runner.os }}-3.12
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 74f0d60..6f71ea4 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -103,7 +103,7 @@ jobs:
         # fallback lets a near-miss (different source hash) reuse the
         # most recent build state -- CMake then recompiles only what
         # changed.
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: build
           key: build-${{ runner.os }}-${{ hashFiles('**/CMakeLists.txt', 'core/src/**/*.cpp', 'core/src/**/*.h', 'modules/**/*.cpp', 'modules/**/*.h', 'modules/**/*.cs', '.gitmodules', 'version.txt') }}
@@ -113,7 +113,7 @@ jobs:
       - name: Cache NuGet packages
         # FaceModuleHost's dotnet publish restores NuGet packages on every
         # cold run. Caching the user-level NuGet folder keeps them warm.
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ~/.nuget/packages
           key: nuget-${{ runner.os }}-${{ hashFiles('modules/facetracking/src/host/**/*.csproj', 'modules/facetracking/src/host/**/packages.lock.json') }}
@@ -123,7 +123,7 @@ jobs:
       - name: Cache NSIS install
         # Skips the ~30 s choco install on warm runs. Key bumped on NSIS
         # upgrades.
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: 'C:\Program Files (x86)\NSIS'
           key: nsis-${{ runner.os }}-3.12