diff --git a/VERSION b/VERSION
index 15a27998..bea438e9 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.3.0
+3.3.1
diff --git a/lib/rdf/mixin/mutable.rb b/lib/rdf/mixin/mutable.rb
index 4547e366..1f7c8ea3 100644
--- a/lib/rdf/mixin/mutable.rb
+++ b/lib/rdf/mixin/mutable.rb
@@ -41,7 +41,7 @@ def immutable?
     def load(url, graph_name: nil, **options)
       raise TypeError.new("#{self} is immutable") if immutable?
 
-      Reader.open(url, **options.merge(base_uri: url)) do |reader|
+      Reader.open(url, base_uri: url, **options) do |reader|
         if graph_name
           statements = []
           reader.each_statement do |statement|