diff --git a/Gemfile.lock b/Gemfile.lock
index 5cd7be01..affe4c00 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,6 +1,6 @@
 GIT
   remote: https://github.com/ontoportal-lirmm/sparql-client.git
-  revision: aed51baf4106fd0f3d0e3f9238f0aad9406aa3f0
+  revision: 180c818f7715baac64b2699bb452ef5c756f62c5
   branch: master
   specs:
     sparql-client (1.0.1)
@@ -141,8 +141,7 @@ GEM
       macaddr (~> 1.0)
 
 PLATFORMS
-  ruby
-  x86_64-darwin-16
+  x86_64-darwin-23
   x86_64-linux
 
 DEPENDENCIES
@@ -164,4 +163,4 @@ DEPENDENCIES
   uuid
 
 BUNDLED WITH
-   2.4.21
+   2.2.33
diff --git a/lib/goo/mixins/sparql_client.rb b/lib/goo/mixins/sparql_client.rb
index dc2b0728..d4d98523 100644
--- a/lib/goo/mixins/sparql_client.rb
+++ b/lib/goo/mixins/sparql_client.rb
@@ -32,26 +32,25 @@ def validate?
     end
   end
 
-  class Literal
-    def to_base
-      text = []
-      text << %("#{escape(value)}")
-      text << "@#{language}" if has_language?
-      if has_datatype?
-        if datatype.respond_to?:to_base
-          text << "^^#{datatype.to_base}"
-        else
-          text << "^^<#{datatype.to_s}>"
-        end
-      end
-      text.join ""
-    end
-  end
-
-
   class Literal
     class DateTime < Temporal
       FORMAT = '%Y-%m-%dT%H:%M:%S'.freeze # the format that is supported by 4store
     end
+
+    def initialize(value, language: nil, datatype: nil, lexical: nil, validate: false, canonicalize: false, **options)
+      @object   = value.freeze
+      @string   = lexical if lexical
+      @string   = value if !defined?(@string) && value.is_a?(String)
+      @string   = @string.encode(Encoding::UTF_8).freeze if instance_variable_defined?(:@string)
+      @object   = @string if instance_variable_defined?(:@string) && @object.is_a?(String)
+      @language = language.to_s.downcase.to_sym if language
+      @datatype = RDF::URI(datatype).freeze if datatype
+      @datatype ||= self.class.const_get(:DATATYPE) if self.class.const_defined?(:DATATYPE)
+      @datatype ||= instance_variable_defined?(:@language) && @language ? RDF.langString : RDF::URI("http://www.w3.org/2001/XMLSchema#string")
+      @original_datatype = datatype
+    end
+
+    attr_reader :original_datatype
   end
+
 end #end RDF