diff --git a/.github/workflows/elixir.yml b/.github/workflows/elixir.yml
index 59fa7a94..b8c5f409 100644
--- a/.github/workflows/elixir.yml
+++ b/.github/workflows/elixir.yml
@@ -20,7 +20,7 @@ jobs:
       - uses: actions/checkout@v3
       # Cache the ASDF directory, using the values from .tool-versions.
       - name: ASDF cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: ~/.asdf
           key: ${{ runner.os }}-asdf-v3-${{ hashFiles('.tool-versions') }}
@@ -42,12 +42,12 @@ jobs:
       - uses: actions/checkout@v3
       - name: Restore dependencies cache
         id: deps-cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: deps
           key: ${{ runner.os }}-mix-v2-${{ hashFiles('**/mix.lock') }}
       - name: ASDF cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: ~/.asdf
           key: ${{ runner.os }}-asdf-v3-${{ hashFiles('.tool-versions') }}
@@ -66,19 +66,19 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: ASDF cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: ~/.asdf
           key: ${{ runner.os }}-asdf-v3-${{ hashFiles('.tool-versions') }}
       - uses: mbta/actions/reshim-asdf@v1
       - name: Restore dependencies cache
         id: deps-cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: deps
           key: ${{ runner.os }}-mix-v2-${{ hashFiles('**/mix.lock') }}
       - name: Restore dev build cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: _build/dev
           key: ${{ runner.os }}-mix-dev-${{ hashFiles('**/mix.lock') }}
@@ -112,14 +112,14 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: ASDF cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: ~/.asdf
           key: ${{ runner.os }}-asdf-v3-${{ hashFiles('.tool-versions') }}
       - uses: mbta/actions/reshim-asdf@v1
       - name: Restore dependencies cache
         id: deps-cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: deps
           key: ${{ runner.os }}-mix-v2-${{ hashFiles('**/mix.lock') }}
@@ -148,19 +148,19 @@ jobs:
       - name: Restart MQTT to load mosquitto/mosquitto.conf from checkout
         run: docker restart mqtt
       - name: ASDF cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: ~/.asdf
           key: ${{ runner.os }}-asdf-v3-${{ hashFiles('.tool-versions') }}
       - uses: mbta/actions/reshim-asdf@v1
       - name: Restore dependencies cache
         id: deps-cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: deps
           key: ${{ runner.os }}-mix-v2-${{ hashFiles('**/mix.lock') }}
       - name: Restore test build cache
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: _build/test
           key: ${{ runner.os }}-mix-test-${{ hashFiles('**/mix.lock') }}