diff --git a/lib/pg_audit_log/function.rb b/lib/pg_audit_log/function.rb
index f96a29c..876103a 100644
--- a/lib/pg_audit_log/function.rb
+++ b/lib/pg_audit_log/function.rb
@@ -45,7 +45,6 @@ def user_unique_name_temporary_function(username)
 
       def install
         execute <<-SQL
-        CREATE OR REPLACE PROCEDURAL LANGUAGE plpgsql;
         CREATE OR REPLACE FUNCTION #{name}() RETURNS trigger
         LANGUAGE plpgsql
         AS $_$
@@ -81,6 +80,8 @@ def install
                 column_name := col.column_name;
                 IF TG_RELNAME = '#{users_table_name}' AND column_name = '#{users_access_column}' THEN
                   NULL;
+                ELSIF column_name = 'created_at' OR column_name = 'updated_at' THEN
+                  NULL;
                 ELSE
                   IF TG_OP = 'INSERT' OR TG_OP = 'UPDATE' THEN
                     EXECUTE 'SELECT CAST($1 . '|| column_name ||' AS TEXT)' INTO new_value USING NEW;