diff --git a/lib/iban-tools/rules.yml b/lib/iban-tools/rules.yml
index d5ad26c..ba147c9 100644
--- a/lib/iban-tools/rules.yml
+++ b/lib/iban-tools/rules.yml
@@ -130,6 +130,11 @@
   length: 27
   bban_pattern: '\d{7}[A-Z0-9]{16}'
 
+'GT':
+  # Guatemala
+  length: 28
+  bban_pattern: '[A-Z]{4}\d{20}'
+
 'HR':
   # Croatia
   length: 21
@@ -324,3 +329,8 @@
   # Virgin Islands
   length: 24
   bban_pattern: '[A-Z0-9]{4}\d{16}'
+
+'XK':
+  # Kosovo
+  length: 20
+  bban_pattern: '\d{16}'
diff --git a/spec/iban-tools/iban_spec.rb b/spec/iban-tools/iban_spec.rb
index c6f404a..e9a64c3 100644
--- a/spec/iban-tools/iban_spec.rb
+++ b/spec/iban-tools/iban_spec.rb
@@ -119,6 +119,7 @@ module IBANTools
         "GI75NWBK000000007099453",
         "GL4330003330229543",
         "GR1601101250000000012300695",
+        "GT82TRAJ01020000001210029690",
         "HR1210010051863000160",
         "HU42117730161111101800000000",
         "IE29AIBK93115212345678",
@@ -155,7 +156,8 @@ module IBANTools
         "SM86U0322509800000000270100",
         "TN5914207207100707129648",
         "TR330006100519786457841326",
-        "UA173052990006762462622943782"
+        "UA173052990006762462622943782",
+        "XK051212012345678906"
       ].each do |iban_code|
         describe iban_code do
           it "should be valid" do