diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d591d35..15cd54e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,12 +14,16 @@ jobs:
       matrix:
         ruby: ["3.1", "3.2", "3.3"]
         puppet: ["~> 7.0", "~> 8.0"]
+        concat: ["4.2.1", "v7.0.0", "v9.0.2"]
         exclude:
           - ruby: "3.3"
             puppet: "~> 7.0"
 
     env:
       PUPPET_VERSION: ${{ matrix.puppet }}
+      CONCAT_VERSION: ${{ matrix.concat }}
+
+    name: Ruby ${{ matrix.ruby }} - Puppet ${{ matrix.puppet }} - Concat ${{ matrix.concat }}
 
     steps:
       - uses: actions/checkout@v4
@@ -30,6 +34,10 @@ jobs:
           ruby-version: ${{ matrix.ruby }}
           bundler-cache: true
 
+      - name: Set concat version
+        run: |
+          sed -i "s/ref: v9.0.2/ref: ${CONCAT_VERSION}/" .fixtures.yml
+
       - name: Run tests
         run: bundle exec rake spec
 
diff --git a/manifests/init.pp b/manifests/init.pp
index b5f61d1..6faf252 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -56,7 +56,6 @@
     owner   => 'root',
     group   => 'root',
     mode    => '0644',
-    force   => true,
     require => Package['sysfsutils'],
   }
 
diff --git a/manifests/setting.pp b/manifests/setting.pp
index b24b54d..d8797ad 100644
--- a/manifests/setting.pp
+++ b/manifests/setting.pp
@@ -1,6 +1,6 @@
 define sysfs::setting($value) {
-  concat::fragment { "${name}":
-    target => "/etc/sysfs.conf",
+  concat::fragment { $name:
+    target  => '/etc/sysfs.conf',
     content => "${name}=${value}\n";
   }
 }
diff --git a/spec/classes/sysfs_spec.rb b/spec/classes/sysfs_spec.rb
index ff98d4d..b977e3a 100644
--- a/spec/classes/sysfs_spec.rb
+++ b/spec/classes/sysfs_spec.rb
@@ -14,7 +14,6 @@
         'owner' => 'root',
         'group' => 'root',
         'mode'  => '0644',
-        'force' => true,
       )
     end
 
@@ -93,7 +92,7 @@
         'source' => 'puppet:///modules/sysfs/sysfsutils.service',
         'owner'  => 'root',
         'group'  => 'root',
-        'mode'   => '0700',
+        'mode'   => '0444',
       )
     end