diff --git a/lib/wpscan/db/dynamic_finders/base.rb b/lib/wpscan/db/dynamic_finders/base.rb
index 5219b971..22040d7d 100644
--- a/lib/wpscan/db/dynamic_finders/base.rb
+++ b/lib/wpscan/db/dynamic_finders/base.rb
@@ -11,7 +11,11 @@ module WPScan
 
         # @return [ Hash ]
         def self.all_df_data
-          @all_df_data ||= YAML.safe_load(File.read(df_file), [Regexp])
+          @all_df_data ||= if Gem::Version.new(Psych::VERSION) >= Gem::Version.new('4.0.0')
+                             YAML.safe_load(File.read(df_file), permitted_classes: [Regexp])
+                           else
+                             YAML.safe_load(File.read(df_file), [Regexp])
+                           end
         end
 
         # @return [ Array<Symbol> ]