diff --git a/.github/workflows/elixir.yml b/.github/workflows/elixir.yml
index 94da218..4db3df3 100644
--- a/.github/workflows/elixir.yml
+++ b/.github/workflows/elixir.yml
@@ -1,16 +1,11 @@
 name: Elixir CI
 
-# Define workflow that runs when changes are pushed to the
-# `main` branch or pushed to a PR branch that targets the `main`
-# branch. Change the branch name if your project uses a
-# different name for the main branch like "master" or "production".
 on:
   push:
-    branches: [ "main" ]  # adapt branch for project
+    branches: [ "main" ]
   pull_request:
-    branches: [ "main" ]  # adapt branch for project
+    branches: [ "main" ]
 
-# Sets the ENV `MIX_ENV` to `test` for running tests
 env:
   MIX_ENV: test
 
@@ -19,12 +14,9 @@ permissions:
 
 jobs:
   test:
-    # Set up a Postgres DB service. By default, Phoenix applications
-    # use Postgres. This creates a database for running tests.
-    # Additional services can be defined here if required.
     services:
       db:
-        image: postgres:12
+        image: postgres:15
         ports: ['5432:5432']
         env:
           POSTGRES_PASSWORD: password
@@ -37,80 +29,46 @@ jobs:
     runs-on: ubuntu-latest
     name: Test on OTP ${{matrix.otp}} / Elixir ${{matrix.elixir}}
     strategy:
-      # Specify the OTP and Elixir versions to use when building
-      # and running the workflow steps.
       matrix:
-        otp: ['26']       # Define the OTP version [required]
-        elixir: ['1.15.4']    # Define the elixir version [required]
+        otp: ['26']
+        elixir: ['1.15.4']
+
     steps:
-    # Step: Setup Elixir + Erlang image as the base.
+    - uses: actions/checkout@v4
+
     - name: Set up Elixir
       uses: erlef/setup-beam@v1
       with:
         otp-version: ${{matrix.otp}}
         elixir-version: ${{matrix.elixir}}
 
-    # Step: Check out the code.
-    - name: Checkout code
-      uses: actions/checkout@v3
-
-    # Step: Define how to cache deps. Restores existing cache if present.
-    - name: Cache deps
-      id: cache-deps
-      uses: actions/cache@v3
-      env:
-        cache-name: cache-elixir-deps
-      with:
-        path: deps
-        key: ${{ runner.os }}-mix-${{ env.cache-name }}-${{ hashFiles('**/mix.lock') }}
-        restore-keys: |
-          ${{ runner.os }}-mix-${{ env.cache-name }}-
-
-    # Step: Define how to cache the `_build` directory. After the first run,
-    # this speeds up tests runs a lot. This includes not re-compiling our
-    # project's downloaded deps every run.
-    - name: Cache compiled build
-      id: cache-build
-      uses: actions/cache@v3
-      env:
-        cache-name: cache-compiled-build
+    - name: Cache Dependencies and Build
+      uses: actions/cache@v4
       with:
-        path: _build
-        key: ${{ runner.os }}-mix-${{ env.cache-name }}-${{ hashFiles('**/mix.lock') }}
+        path: |
+          deps
+          _build
+        key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}-${{ matrix.otp }}-${{ matrix.elixir }}
         restore-keys: |
-          ${{ runner.os }}-mix-${{ env.cache-name }}-
+          ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}-
           ${{ runner.os }}-mix-
 
-    # Step: Conditionally bust the cache when job is re-run.
-    # Sometimes, we may have issues with incremental builds that are fixed by
-    # doing a full recompile. In order to not waste dev time on such trivial
-    # issues (while also reaping the time savings of incremental builds for
-    # *most* day-to-day development), force a full recompile only on builds
-    # that are retried.
-    - name: Clean to rule out incremental build as a source of flakiness
+    - name: Clean on retry
       if: github.run_attempt != '1'
       run: |
         mix deps.clean --all
         mix clean
       shell: sh
 
-    # Step: Download project dependencies. If unchanged, uses
-    # the cached version.
     - name: Install dependencies
       run: mix deps.get
 
-    # Step: Compile the project treating any warnings as errors.
-    # Customize this step if a different behavior is desired.
     - name: Compiles without warnings
       run: mix compile --warnings-as-errors
 
-    # Step: Check that the checked in code has already been formatted.
-    # This step fails if something was found unformatted.
-    # Customize this step as desired.
     - name: Check Formatting
       run: mix format --check-formatted
 
-    # Step: Execute the tests.
     - name: Run tests
       run: mix test
 
@@ -120,7 +78,7 @@ jobs:
     if: ${{ github.ref == 'refs/heads/main' }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: superfly/flyctl-actions/setup-flyctl@master
       - run: flyctl deploy --remote-only
         env: