diff --git a/.circleci/config.yml b/.circleci/config.yml
index fbc92717..1ec2a9f0 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -29,13 +29,19 @@ commands:
 
 jobs:
   solidus-master:
-    executor: solidusio_extensions/sqlite
+    executor:
+      name: solidusio_extensions/sqlite
+      ruby_version: '3.1'
     steps: ['setup', 'solidusio_extensions/run-tests-solidus-master', 'notify']
   solidus-current:
-    executor: solidusio_extensions/sqlite
+    executor:
+      name: solidusio_extensions/sqlite
+      ruby_version: '3.0'
     steps: ['setup', 'solidusio_extensions/run-tests-solidus-current', 'notify']
   solidus-older:
-    executor: solidusio_extensions/sqlite
+    executor:
+      name: solidusio_extensions/sqlite
+      ruby_version: '2.7'
     steps: ['setup', 'solidusio_extensions/run-tests-solidus-older', 'notify']
   lint-code:
     executor: solidusio_extensions/sqlite
diff --git a/README.md b/README.md
index 34f0326b..7ade6846 100644
--- a/README.md
+++ b/README.md
@@ -38,11 +38,11 @@ in solidus_dev_support.
 
 #### Updating existing extensions
 
-If you have an existing extension and want to update it to use the latest standards from this gem,
-you can run the following in the extension's directory:
+If you have an existing extension generated with `solidus_dev_support` and want to update it to use
+the latest standards from this gem, you can run the following in the extension's directory:
 
 ```console
-$ solidus extension .
+$ bundle exec solidus extension .
 ```
 
 In case of conflicting files, you will be prompted for an action. You can overwrite the files with
diff --git a/lib/solidus_dev_support/templates/extension/.circleci/config.yml b/lib/solidus_dev_support/templates/extension/.circleci/config.yml
index 98a5c19b..28d70ebd 100644
--- a/lib/solidus_dev_support/templates/extension/.circleci/config.yml
+++ b/lib/solidus_dev_support/templates/extension/.circleci/config.yml
@@ -11,25 +11,30 @@ orbs:
   solidusio_extensions: solidusio/extensions@volatile
 
 jobs:
+  run-specs-with-sqlite:
+    executor: solidusio_extensions/sqlite
+    steps:
+      - browser-tools/install-chrome
+      - solidusio_extensions/run-tests
   run-specs-with-postgres:
     executor: solidusio_extensions/postgres
     steps:
-      - browser-tools/install-browser-tools
+      - browser-tools/install-chrome
       - solidusio_extensions/run-tests
   run-specs-with-mysql:
     executor: solidusio_extensions/mysql
     steps:
-      - browser-tools/install-browser-tools
+      - browser-tools/install-chrome
       - solidusio_extensions/run-tests
   lint-code:
     executor: solidusio_extensions/sqlite-memory
     steps:
-      - browser-tools/install-browser-tools
       - solidusio_extensions/lint-code
 
 workflows:
   "Run specs on supported Solidus versions":
     jobs:
+      - run-specs-with-sqlite
       - run-specs-with-postgres
       - run-specs-with-mysql
       - lint-code
@@ -43,5 +48,6 @@ workflows:
               only:
                 - master
     jobs:
+      - run-specs-with-sqlite
       - run-specs-with-postgres
       - run-specs-with-mysql
diff --git a/lib/solidus_dev_support/templates/extension/.github/stale.yml b/lib/solidus_dev_support/templates/extension/.github/stale.yml
index 03407b31..0d0b1c99 100644
--- a/lib/solidus_dev_support/templates/extension/.github/stale.yml
+++ b/lib/solidus_dev_support/templates/extension/.github/stale.yml
@@ -1,17 +1 @@
-# Number of days of inactivity before an issue becomes stale
-daysUntilStale: 60
-# Number of days of inactivity before a stale issue is closed
-daysUntilClose: false
-# Issues with these labels will never be considered stale
-exemptLabels:
-  - pinned
-  - security
-# Label to use when marking an issue as stale
-staleLabel: stale
-# Comment to post when marking an issue as stale. Set to `false` to disable
-markComment: >
-  This issue has been automatically marked as stale because it has not had
-  recent activity. It might be closed if no further activity occurs. Thank you
-  for your contributions.
-# Comment to post when closing a stale issue. Set to `false` to disable
-closeComment: false
+_extends: .github
diff --git a/lib/solidus_dev_support/templates/extension/Gemfile b/lib/solidus_dev_support/templates/extension/Gemfile.tt
similarity index 96%
rename from lib/solidus_dev_support/templates/extension/Gemfile
rename to lib/solidus_dev_support/templates/extension/Gemfile.tt
index 5510b62e..5b25fe24 100644
--- a/lib/solidus_dev_support/templates/extension/Gemfile
+++ b/lib/solidus_dev_support/templates/extension/Gemfile.tt
@@ -15,9 +15,10 @@ gem 'solidus_frontend' if branch >= 'v3.2' # rubocop:disable Bundler/DuplicatedG
 # See https://github.com/bundler/bundler/issues/6677
 gem 'rails', '>0.a'
 
+<% if file_name != 'solidus_auth_devise' %>
 # Provides basic authentication functionality for testing parts of your engine
 gem 'solidus_auth_devise'
-
+<% end %>
 case ENV.fetch('DB', nil)
 when 'mysql'
   gem 'mysql2'
diff --git a/lib/solidus_dev_support/templates/extension/LICENSE b/lib/solidus_dev_support/templates/extension/LICENSE
index 85c644f6..7f8cc47f 100644
--- a/lib/solidus_dev_support/templates/extension/LICENSE
+++ b/lib/solidus_dev_support/templates/extension/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) <%= Time.now.year %> [name of plugin creator]
+Copyright (c) <%= Time.now.year %> <%= gemspec.authors.join ', ' %>
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification,
diff --git a/lib/solidus_dev_support/templates/extension/README.md b/lib/solidus_dev_support/templates/extension/README.md
index 11bf3a4f..3cc1a4f0 100644
--- a/lib/solidus_dev_support/templates/extension/README.md
+++ b/lib/solidus_dev_support/templates/extension/README.md
@@ -71,21 +71,10 @@ $ bin/rails server
 Use Ctrl-C to stop
 ```
 
-### Updating the changelog
-
-Before and after releases the changelog should be updated to reflect the up-to-date status of
-the project:
-
-```shell
-bin/rake changelog
-git add CHANGELOG.md
-git commit -m "Update the changelog"
-```
-
 ### Releasing new versions
 
-Please refer to the dedicated [page](https://github.com/solidusio/solidus/wiki/How-to-release-extensions) on Solidus wiki.
+Please refer to the [dedicated page](https://github.com/solidusio/solidus/wiki/How-to-release-extensions) in the Solidus wiki.
 
 ## License
 
-Copyright (c) <%= Time.now.year %> [name of extension author], released under the New BSD License.
+Copyright (c) <%= Time.now.year %> <%= gemspec.authors.join ', ' %>, released under the New BSD License.
diff --git a/lib/solidus_dev_support/templates/extension/bin/sandbox.tt b/lib/solidus_dev_support/templates/extension/bin/sandbox.tt
index 38a7d026..00f421d6 100755
--- a/lib/solidus_dev_support/templates/extension/bin/sandbox.tt
+++ b/lib/solidus_dev_support/templates/extension/bin/sandbox.tt
@@ -1,32 +1,9 @@
 #!/usr/bin/env bash
 
 set -e
-if [ -n "$DEBUG" ]
-then
-  set -x
-fi
+test -z "${DEBUG+empty_string}" || set -x
 
-case "$DB" in
-postgres|postgresql)
-  RAILSDB="postgresql"
-  ;;
-mysql)
-  RAILSDB="mysql"
-  ;;
-sqlite3|sqlite)
-  RAILSDB="sqlite3"
-  ;;
-'')
-  echo "~~> Use 'export DB=[postgres|mysql|sqlite]' to control the DB adapter"
-  RAILSDB="sqlite3"
-  ;;
-*)
-  echo "Invalid value specified for the Solidus sandbox: DB=\"$DB\"."
-  echo "Please use 'postgres', 'mysql', or 'sqlite' instead."
-  exit 1
-  ;;
-esac
-echo "~~> Using $RAILSDB as the database engine"
+test "$DB" = "sqlite" && export DB="sqlite3"
 
 if [ -z "$SOLIDUS_BRANCH" ]
 then
@@ -50,7 +27,8 @@ function unbundled {
 }
 
 rm -rf ./sandbox
-unbundled bundle exec rails new sandbox --database="$RAILSDB" \
+unbundled bundle exec rails new sandbox \
+  --database="${DB:-sqlite3}" \
   --skip-bundle \
   --skip-git \
   --skip-keeps \
diff --git a/lib/solidus_dev_support/templates/extension/gitignore b/lib/solidus_dev_support/templates/extension/gitignore
index 325c3c99..1ba20966 100644
--- a/lib/solidus_dev_support/templates/extension/gitignore
+++ b/lib/solidus_dev_support/templates/extension/gitignore
@@ -8,6 +8,7 @@
 .sass-cache
 coverage
 Gemfile.lock
+Gemfile-local
 tmp
 nbproject
 pkg
diff --git a/lib/solidus_dev_support/templates/extension/lib/generators/%file_name%/install/install_generator.rb.tt b/lib/solidus_dev_support/templates/extension/lib/generators/%file_name%/install/install_generator.rb.tt
index bef0b61a..48b65fe2 100644
--- a/lib/solidus_dev_support/templates/extension/lib/generators/%file_name%/install/install_generator.rb.tt
+++ b/lib/solidus_dev_support/templates/extension/lib/generators/%file_name%/install/install_generator.rb.tt
@@ -6,6 +6,10 @@ module <%= class_name %>
       class_option :auto_run_migrations, type: :boolean, default: false
       source_root File.expand_path('templates', __dir__)
 
+      def self.exit_on_failure?
+        true
+      end
+
       def copy_initializer
         template 'initializer.rb', 'config/initializers/<%= file_name %>.rb'
       end