diff --git a/data/raw/pseudo_ibans.yml b/data/raw/pseudo_ibans.yml
index e38f133..0cecd94 100644
--- a/data/raw/pseudo_ibans.yml
+++ b/data/raw/pseudo_ibans.yml
@@ -13,13 +13,16 @@ AU:
   :pseudo_iban_account_number_length: 10
   :national_id_length: 6
 CA:
-  :bank_code_length: 4
+  :bank_code_length: !ruby/range
+    begin: 3
+    end: 4
+    excl: false
   :branch_code_length: 5
   :account_number_length: !ruby/range
     begin: 7
     end: 12
     excl: false
-  :bank_code_format: "\\d{4}"
+  :bank_code_format: "\\d{3,4}"
   :branch_code_format: "0{0,4}[1-9][0-9]{0,4}"
   :account_number_format: "(?!0+\\z)\\d{7,12}"
   :national_id_length: 9
diff --git a/data/structures.yml b/data/structures.yml
index 5878b57..57a34c0 100644
--- a/data/structures.yml
+++ b/data/structures.yml
@@ -1493,13 +1493,16 @@ AU:
   :pseudo_iban_account_number_length: 10
   :national_id_length: 6
 CA:
-  :bank_code_length: 4
+  :bank_code_length: !ruby/range
+    begin: 3
+    end: 4
+    excl: false
   :branch_code_length: 5
   :account_number_length: !ruby/range
     begin: 7
     end: 12
     excl: false
-  :bank_code_format: "\\d{4}"
+  :bank_code_format: "\\d{3,4}"
   :branch_code_format: 0{0,4}[1-9][0-9]{0,4}
   :account_number_format: "(?!0+\\z)\\d{7,12}"
   :national_id_length: 9
diff --git a/lib/ibandit/iban.rb b/lib/ibandit/iban.rb
index ec1c8f4..d678bd2 100644
--- a/lib/ibandit/iban.rb
+++ b/lib/ibandit/iban.rb
@@ -158,14 +158,21 @@ def valid_length?
 
     def valid_bank_code_length?
       return unless valid_country_code?
-      return true if structure[:bank_code_length]&.zero?
+      return true if structure[:bank_code_length].is_a?(Integer) && structure[:bank_code_length].zero?
 
       if swift_bank_code.nil? || swift_bank_code.empty?
         @errors[:bank_code] = Ibandit.translate(:is_required)
         return false
       end
 
-      return true if swift_bank_code.length == structure[:bank_code_length]
+      case structure[:bank_code_length]
+      when Range
+        if structure[:bank_code_length].include?(swift_bank_code.length)
+          return true
+        end
+      else
+        return true if swift_bank_code.length == structure[:bank_code_length]
+      end
 
       @errors[:bank_code] =
         Ibandit.translate(:wrong_length, expected: structure[:bank_code_length])
@@ -240,7 +247,7 @@ def valid_format?
 
     def valid_bank_code_format?
       return unless valid_bank_code_length?
-      return true if structure[:bank_code_length]&.zero?
+      return true if structure[:bank_code_length].is_a?(Integer) && structure[:bank_code_length].zero?
 
       if swift_bank_code&.match?(
         entire_string_regex(structure[:bank_code_format]),