diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 92c9d7549..010522574 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,7 +6,7 @@ on:
   pull_request:
     branches: [ master ]
   schedule:
-    - cron: "0 8 * * *"
+    - cron: "0 0 * * Fri"
 
 defaults:
   run:
@@ -23,7 +23,7 @@ jobs:
           - ubuntu-24.04
           - macos-12
           - macos-13
-          - macos-14  # M1 CPU
+          - macos-14
           - windows-2019
           - windows-2022
     steps:
@@ -47,15 +47,24 @@ jobs:
           SERVICE_NAME: ${{ steps.postgres.outputs.service-name }}
           EXPECTED_CONNECTION_URI: postgresql://postgres:postgres@localhost:5432/postgres
           EXPECTED_SERVICE_NAME: postgres
+          EXPECTED_SERVER_VERSION: "16"
 
   parametrized:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os:
-          - ubuntu-latest
-          - macos-latest
-          - windows-latest
+          - ubuntu-20.04
+          - ubuntu-22.04
+          - ubuntu-24.04
+          - macos-12
+          - macos-13
+          - macos-14
+          - windows-2019
+          - windows-2022
+        postgres-version:
+          - "14"
+          - "15"
     steps:
       - uses: actions/checkout@v4
 
@@ -66,6 +75,7 @@ jobs:
           password: GrandMaster
           database: jedi_order
           port: 34837
+          postgres-version: ${{ matrix.postgres-version }}
         id: postgres
 
       - name: Run setup-python
@@ -82,3 +92,4 @@ jobs:
           SERVICE_NAME: ${{ steps.postgres.outputs.service-name }}
           EXPECTED_CONNECTION_URI: postgresql://yoda:GrandMaster@localhost:34837/jedi_order
           EXPECTED_SERVICE_NAME: yoda
+          EXPECTED_SERVER_VERSION: ${{ matrix.postgres-version }}
diff --git a/README.md b/README.md
index 5115bceb3..8aefbe802 100644
--- a/README.md
+++ b/README.md
@@ -9,12 +9,13 @@ key features:
 
 * Runs on Linux, macOS and Windows action runners.
 * Adds PostgreSQL [client applications][1] to `PATH`.
-* Uses PostgreSQL binaries baked into [GitHub Actions Runner Images][2].
-* Easy [to prove][3] that it DOES NOT contain malicious code.
+* PostgreSQL version can be parametrized.
+* Easy [to verify][2] that it DOES NOT contain malicious code.
+
+By default PostgreSQL 15 is used.
 
 [1]: https://www.postgresql.org/docs/current/reference-client.html
-[2]: https://github.com/actions/runner-images
-[3]: action.yml
+[2]: action.yml
 
 ## Usage
 
@@ -33,12 +34,13 @@ key features:
 
 #### Action Parameters
 
-| Key        | Value                                                                                                | Default     |
-|------------|------------------------------------------------------------------------------------------------------|-------------|
-| username   | The username of the user to setup.                                                                   | `postgres`  |
-| password   | The password of the user to setup.                                                                   | `postgres`  |
-| database   | The database name to setup and grant permissions to created user.                                    | `postgres`  |
-| port       | The server port to listen on.                                                                        | `5432`      |
+| Key              | Value                                                                              | Default     |
+|------------------|------------------------------------------------------------------------------------|-------------|
+| username         | The username of the user to setup.                                                 | `postgres`  |
+| password         | The password of the user to setup.                                                 | `postgres`  |
+| database         | The database name to setup and grant permissions to created user.                  | `postgres`  |
+| port             | The server port to listen on.                                                      | `5432`      |
+| postgres-version | The PostgreSQL major version to install. Supported values: "14", "15", "16".       | `16`        |
 
 #### Outputs
 
@@ -58,19 +60,20 @@ key features:
 
 ```yaml
 steps:
-  - uses: ikalnytskyi/action-setup-postgres@v6 
+  - uses: ikalnytskyi/action-setup-postgres@v6
 ```
 
 #### Advanced
 
 ```yaml
 steps:
-  - uses: ikalnytskyi/action-setup-postgres@v6 
+  - uses: ikalnytskyi/action-setup-postgres@v6
     with:
       username: ci
       password: sw0rdfish
       database: test
       port: 34837
+      postgres-version: "14"
     id: postgres
 
   - run: pytest -vv tests/
@@ -88,7 +91,7 @@ steps:
 
 ```yaml
 steps:
-  - uses: ikalnytskyi/action-setup-postgres@v6 
+  - uses: ikalnytskyi/action-setup-postgres@v6
 
   - run: |
       createuser myuser
@@ -110,7 +113,7 @@ steps:
 
 ```yaml
 steps:
-  - uses: ikalnytskyi/action-setup-postgres@v6 
+  - uses: ikalnytskyi/action-setup-postgres@v6
 ```
 
 ```python
diff --git a/action.yml b/action.yml
index d63da77a1..14c95da76 100644
--- a/action.yml
+++ b/action.yml
@@ -21,6 +21,10 @@ inputs:
     description: The server port to listen on.
     default: "5432"
     required: false
+  postgres-version:
+    description: The PostgreSQL major version to install. Either "14", "15", or "16".
+    default: "16"
+    required: false
 outputs:
   connection-uri:
     description: The connection URI to connect to PostgreSQL.
@@ -31,38 +35,63 @@ outputs:
 runs:
   using: composite
   steps:
-    - name: Prerequisites
+    - name: Install PostgreSQL
       run: |
+        if [[ ! "${{ inputs.postgres-version }}" =~ ^(14|15|16)$ ]]; then
+          echo "::error::postgres-version must be one of: 14, 15, 16."
+          exit 1
+        fi
+
         if [ "$RUNNER_OS" == "Linux" ]; then
-          echo "$(pg_config --bindir)" >> $GITHUB_PATH
-        elif [ "$RUNNER_OS" == "Windows" ]; then
-          echo "$PGBIN" >> $GITHUB_PATH
-          echo "PQ_LIB_DIR=$PGROOT\lib" >> $GITHUB_ENV
+          APT_ENTRY="deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main"
+          APT_KEY="https://www.postgresql.org/media/keys/ACCC4CF8.asc"
+
+          echo "$APT_ENTRY" | sudo tee /etc/apt/sources.list.d/pgdg.list
+          wget --quiet -O - "$APT_KEY" | sudo apt-key add -
+          sudo apt-get update
+          sudo apt-get -y install postgresql-${{ inputs.postgres-version }}
+
+          PG_BINDIR=$("/usr/lib/postgresql/${{ inputs.postgres-version }}/bin/pg_config" --bindir)
+          echo "$PG_BINDIR" >> $GITHUB_PATH
 
+        elif [ "$RUNNER_OS" == "Windows" ]; then
           # The Windows runner has some PostgreSQL environment variables set
           # that may confuse users since they may be irrelevant to the
-          # PostgreSQL server we're using.
+          # PostgreSQL server we're using. Since GitHub actions does not
+          # support unsetting environment variables, the best we can do is to
+          # clear their values in order to indicate they must not be used.
           for name in "PGROOT" "PGDATA" "PGBIN" "PGUSER" "PGPASSWORD"; do
             echo "$name=" >> $GITHUB_ENV
           done
+
+          choco install postgresql${{ inputs.postgres-version }} \
+            --params "/Password:${{ inputs.password }}" \
+            --ia "--enable-components server,commandlinetools --extract-only 1" \
+            --no-progress
+
+          PG_BINDIR=$("$PROGRAMFILES/PostgreSQL/${{ inputs.postgres-version }}/bin/pg_config.exe" --bindir)
+          PG_LIBDIR=$("$PROGRAMFILES/PostgreSQL/${{ inputs.postgres-version }}/bin/pg_config.exe" --libdir)
+
+          echo "$PG_BINDIR" >> $GITHUB_PATH
+          echo "PQ_LIB_DIR=$PG_LIBDIR" >> $GITHUB_ENV
+
         elif [ "$RUNNER_OS" == "macOS" ]; then
-          case "$(sw_vers -productVersion)" in
-            13.*|14.*)
-              # Unfortunately, the macOS 13 runner image doesn't come w/
-              # pre-installed PostgreSQL server.
-              export HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK=1
-              export HOMEBREW_NO_INSTALL_CLEANUP=1
-              export HOMEBREW_NO_INSTALL_UPGRADE=1
-              brew install --skip-post-install postgresql@14
-              ;;
-          esac
+          export HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK=1
+          export HOMEBREW_NO_INSTALL_CLEANUP=1
+          export HOMEBREW_NO_INSTALL_UPGRADE=1
+          brew install --skip-post-install postgresql@${{ inputs.postgres-version }}
+
+          # Link PostgreSQL binaries from /usr/local/bin in order to make them
+          # available globally. The overwrite option is required since some
+          # GitHub runners come with preinstalled PostgreSQL binaries.
+          brew link --overwrite postgresql@${{ inputs.postgres-version }}
         fi
       shell: bash
 
     - name: Setup and start PostgreSQL
       run: |
-        export PGDATA="$RUNNER_TEMP/pgdata"
-        export PWFILE="$RUNNER_TEMP/pwfile"
+        PGDATA="$RUNNER_TEMP/pgdata"
+        PWFILE="$RUNNER_TEMP/pwfile"
 
         DEFAULT_ENCODING="UTF-8"
         DEFAULT_LOCALE="en_US.$DEFAULT_ENCODING"
@@ -91,6 +120,7 @@ runs:
         #
         # [1] https://www.postgresql.org/docs/15/reference-client.html
         initdb \
+          --pgdata="$PGDATA" \
           --username="${{ inputs.username }}" \
           --pwfile="$PWFILE" \
           --auth="scram-sha-256" \
@@ -102,7 +132,7 @@ runs:
         # directory we have no permissions to (owned by system postgres user).
         echo "unix_socket_directories = ''" >> "$PGDATA/postgresql.conf"
         echo "port = ${{ inputs.port }}" >> "$PGDATA/postgresql.conf"
-        pg_ctl start
+        pg_ctl start --pgdata="$PGDATA"
 
         # Save required connection parameters for created superuser to the
         # connection service file [1]. This allows using these connection
diff --git a/test_action.py b/test_action.py
index 537d3fd62..809b2aa9c 100644
--- a/test_action.py
+++ b/test_action.py
@@ -140,6 +140,13 @@ def test_environment_variables(is_windows: bool):
     assert pg_environ == pg_environ_exp
 
 
+def test_server_version(connection: psycopg.Connection):
+    """Test that PostgreSQL's version is expected."""
+
+    server_version = connection.execute("SHOW SERVER_VERSION").fetchone()[0]
+    assert server_version.split(".")[0] == os.getenv("EXPECTED_SERVER_VERSION")
+
+
 def test_user_permissions(connection: psycopg.Connection):
     """Test that a user has super/createdb permissions."""