diff --git a/shard.yml b/shard.yml
index d1eb65e..fd37f93 100644
--- a/shard.yml
+++ b/shard.yml
@@ -3,12 +3,12 @@ name: oq
 description: |
   A performant, and portable jq wrapper thats facilitates the consumption and output of formats other than JSON; using jq filters to transform the data.
 
-version: 0.2.0
+version: 0.2.1
 
 authors:
   - Blacksmoke16 <Blacksmoke16@eve.tools>
 
-crystal: 0.29.0
+crystal: 0.30.0
 
 license: MIT
 
diff --git a/snap/snapcraft.yaml b/snap/snapcraft.yaml
index ed47aa7..5bcdf27 100644
--- a/snap/snapcraft.yaml
+++ b/snap/snapcraft.yaml
@@ -1,5 +1,5 @@
 name: oq
-version: '0.2.0'
+version: '0.2.1'
 summary: A performant, and portable jq wrapper to support formats other than JSON
 description: |
   A performant, and portable jq wrapper thats facilitates the consumption and output of formats other than JSON; using jq filters to transform the data.
diff --git a/src/converters/xml.cr b/src/converters/xml.cr
index 07ea27a..cd36516 100644
--- a/src/converters/xml.cr
+++ b/src/converters/xml.cr
@@ -17,7 +17,7 @@ module OQ::Converters::Xml
 
     loop do
       emit builder, json, xml_item: xml_item
-      break if json.kind == :EOF
+      break if json.kind.eof?
     end
 
     builder.end_element unless root.blank?
@@ -36,10 +36,10 @@ module OQ::Converters::Xml
 
   private def self.emit(builder : XML::Builder, json : JSON::PullParser, key : String? = nil, array_key : String? = nil, *, xml_item : String) : Nil
     case json.kind
-    when :null                        then json.read_null
-    when :string, :int, :float, :bool then builder.text get_value json
-    when :begin_object                then handle_object builder, json, key, array_key, xml_item: xml_item
-    when :begin_array                 then handle_array builder, json, key, array_key, xml_item: xml_item
+    when .null?                           then json.read_null
+    when .string?, .int?, .float?, .bool? then builder.text get_value json
+    when .begin_object?                   then handle_object builder, json, key, array_key, xml_item: xml_item
+    when .begin_array?                    then handle_array builder, json, key, array_key, xml_item: xml_item
     end
   end
 
@@ -48,7 +48,7 @@ module OQ::Converters::Xml
     json.read_object do |k|
       if k.starts_with?('@')
         builder.attribute k.lchop('@'), get_value json
-      elsif json.kind == :begin_array || k == "#text"
+      elsif json.kind.begin_array? || k == "#text"
         emit builder, json, k, k, xml_item: xml_item
       else
         builder.element k do
@@ -62,10 +62,10 @@ module OQ::Converters::Xml
     json.read_begin_array
     array_key = array_key || xml_item
 
-    if json.kind == :end_array
+    if json.kind.end_array?
       builder.element(array_key) { } unless @@at_root
     else
-      while json.kind != :end_array
+      until json.kind.end_array?
         builder.element array_key do
           emit builder, json, key, xml_item: xml_item
         end
@@ -77,10 +77,10 @@ module OQ::Converters::Xml
 
   private def self.get_value(json : JSON::PullParser) : String
     case json.kind
-    when :string then json.read_string
-    when :int    then json.read_int.to_s
-    when :float  then json.read_float.to_s
-    when :bool   then json.read_bool.to_s
+    when .string? then json.read_string
+    when .int?    then json.read_int.to_s
+    when .float?  then json.read_float.to_s
+    when .bool?   then json.read_bool.to_s
     else
       ""
     end
diff --git a/src/converters/yaml.cr b/src/converters/yaml.cr
index 70b290e..821b780 100644
--- a/src/converters/yaml.cr
+++ b/src/converters/yaml.cr
@@ -1,10 +1,3 @@
-class JSON::Builder
-  def next_is_object_key?
-    state = @state.last
-    state.is_a?(ObjectState) && state.name
-  end
-end
-
 module OQ::Converters::Yaml
   # OPTIMIZE: Figure out a way to handle aliases/anchors while streaming.
   def self.deserialize(input : IO, output : IO, **args) : Nil
@@ -20,29 +13,29 @@ module OQ::Converters::Yaml
       yaml.document do
         loop do
           case json.kind
-          when :null
+          when .null?
             yaml.scalar(nil)
-          when :bool
+          when .bool?
             yaml.scalar(json.bool_value)
-          when :int
+          when .int?
             yaml.scalar(json.int_value)
-          when :float
+          when .float?
             yaml.scalar(json.float_value)
-          when :string
+          when .string?
             if YAML::Schema::Core.reserved_string?(json.string_value)
               yaml.scalar(json.string_value, style: :double_quoted)
             else
               yaml.scalar(json.string_value)
             end
-          when :begin_array
+          when .begin_array?
             yaml.start_sequence
-          when :end_array
+          when .end_array?
             yaml.end_sequence
-          when :begin_object
+          when .begin_object?
             yaml.start_mapping
-          when :end_object
+          when .end_object?
             yaml.end_mapping
-          when :EOF
+          when .eof?
             break
           end
           json.read_next
diff --git a/src/oq.cr b/src/oq.cr
index b1c14d0..26b8489 100644
--- a/src/oq.cr
+++ b/src/oq.cr
@@ -6,7 +6,7 @@ require "./converters/*"
 
 # A performant and portable `jq` wrapper to support formats other than JSON.
 module OQ
-  VERSION = "0.2.0"
+  VERSION = "0.2.1"
 
   # The support formats that can be converted to/from.
   enum Format