diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 088dc65..be85e0a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -16,6 +16,8 @@ jobs:
   build:
     runs-on: ubuntu-latest
 
+    name: ${{ matrix.redmine-repository }} ${{ matrix.redmine-version }} ${{ matrix.redmine-database }}
+
     strategy:
       matrix:
         include:
@@ -28,7 +30,7 @@ jobs:
 
           - redmine-repository: 'redmica/redmica'
             redmine-version: 'stable-2.4'
-            redmine-database: 'postgresql'
+            redmine-database: 'postgres:14'
             ruby-version: '3.2'
             expected-about-db-adapter: 'PostgreSQL'
             expected-about-redmine-version: '2\.4\.[0-9]\.stable'
diff --git a/README.md b/README.md
index 5842b16..87eb50b 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,8 @@ This action installs Redmine and sets up an environment to run tests. It is prim
     # The branch, tag or commit to checkout. Default is master.
     version: 'master'
 
-    # Database to use for testing. Available values are sqlite3, postgresql. Default is sqlite3.
+    # Database to use for testing. Available values are sqlite3 or
+    # an official PostgreSQL image tag such as postgres:14. Default is sqlite3.
     database: 'sqlite3'
 
     # Ruby version to use for testing. See ruby/setup-ruby's ruby-version input for available versions.
@@ -36,7 +37,7 @@ See also [action.yml](./action.yml).
   with:
     repository: 'redmica/redmica'
     version: 'v2.4.2'
-    database: 'postgresql'
+    database: 'postgres:14'
     ruby-version: '3.2'
 ```
 
diff --git a/action.yml b/action.yml
index 506d847..ec9c6e2 100644
--- a/action.yml
+++ b/action.yml
@@ -15,7 +15,7 @@ inputs:
     required: true
     default: 'master'
   database:
-    description: 'Database to use for testing. Available values are sqlite3, postgresql. Default is sqlite3.'
+    description: 'Database to use for testing. Available values are sqlite3 or an official PostgreSQL image tag such as postgres:14. Default is sqlite3.'
     required: true
     default: 'sqlite3'
   ruby-version:
@@ -73,7 +73,7 @@ runs:
       shell: bash
 
     - name: Set up PostgreSQL database connection for testing
-      if: ${{ inputs.database == 'postgresql' }}
+      if: ${{ startsWith(inputs.database, 'postgres:') }}
       run: |
         sudo apt-get install -y --no-install-recommends libpq-dev
 
@@ -81,7 +81,7 @@ runs:
           --name redmine-postgres \
           -e POSTGRES_PASSWORD=postgres \
           -p 5432:5432 \
-          -d postgres:14
+          -d ${{ inputs.database }}
 
         cat <<EOS > config/database.yml
           test: