diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 217f60d..912003e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ['3.2', '3.1', '3.0', '2.7', '2.6']
+        ruby-version: ['3.4', '3.3', '3.2', '3.1', '3.0', '2.7']
 
     steps:
     - uses: actions/checkout@v3
@@ -25,10 +25,8 @@ jobs:
       with:
         ruby-version: ${{matrix.ruby-version}}
         bundler-cache: true
-    - name: Updating RubyGems
-      run: gem update --system
     - name: Install dependencies
-      run: bundle install
+      run: bundle install --quiet
     - name: Rubocop
       run: bundle exec rubocop -D
     - name: Rspec
diff --git a/lib/memfs/dir.rb b/lib/memfs/dir.rb
index 486d813..fd9ef5a 100644
--- a/lib/memfs/dir.rb
+++ b/lib/memfs/dir.rb
@@ -160,13 +160,14 @@ def tell
       @pos
     end
 
-    private
-
     GLOB_FLAGS = if defined?(File::FNM_EXTGLOB)
                    File::FNM_EXTGLOB | File::FNM_PATHNAME
                  else
                    File::FNM_PATHNAME
                  end
+    private_constant :GLOB_FLAGS
+
+    private
 
     attr_accessor :entry, :max_seek, :state
 
diff --git a/lib/memfs/file.rb b/lib/memfs/file.rb
index 2b23335..ce4fb9e 100644
--- a/lib/memfs/file.rb
+++ b/lib/memfs/file.rb
@@ -207,7 +207,7 @@ def self.symlink(old_name, new_name)
     end
 
     def self.symlink?(path)
-      lstat_query(path, :symlink?)
+      lstat_query?(path, :symlink?)
     end
 
     def self.truncate(path, length)
@@ -340,10 +340,10 @@ def self.stat_query(path, query, force_boolean: true)
     end
     private_class_method :stat_query
 
-    def self.lstat_query(path, query)
+    def self.lstat_query?(path, query)
       response = fs.find(path) && lstat(path).public_send(query)
       !!response
     end
-    private_class_method :lstat_query
+    private_class_method :lstat_query?
   end
 end