diff --git a/lib/validates_russian/region_numbers.rb b/lib/validates_russian/region_numbers.rb
index 50a58b8..4450349 100644
--- a/lib/validates_russian/region_numbers.rb
+++ b/lib/validates_russian/region_numbers.rb
@@ -1,3 +1,3 @@
 module ValidatesRussian
-  REGION_NUMBERS = %w{01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 75 41 23 24 59 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 76 77 78 79 83 86 87 89 91 92}
+  REGION_NUMBERS = %w[01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 75 41 23 24 59 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 76 77 78 79 81 82 83 86 87 89 91 92 97 99].freeze
 end
diff --git a/lib/validators/kpp_format_validator.rb b/lib/validators/kpp_format_validator.rb
index 50cca8d..eb64d5d 100644
--- a/lib/validators/kpp_format_validator.rb
+++ b/lib/validators/kpp_format_validator.rb
@@ -3,7 +3,6 @@ class KppFormatValidator < ValidatesRussian::Validator
   validates_using do |kpp|
     next false unless kpp.size == 9
     next false unless ValidatesRussian::REGION_NUMBERS.include?(kpp[0..1])
-    next false unless kpp =~ /^\d+$/
-    next false unless kpp[5..6] != '00'
+    next false unless kpp =~ /^\d{4}([a-z]|\d){2}\d{3}$/i
   end
 end