diff --git a/lib/asana/resources/task.rb b/lib/asana/resources/task.rb
index 296dec8..9407d6f 100644
--- a/lib/asana/resources/task.rb
+++ b/lib/asana/resources/task.rb
@@ -381,6 +381,7 @@ def projects(per_page: 20, options: {})
       #
       # Returns an empty data block.
       #
+
       # project - [Gid] The project to add the task to.
       # insert_after - [Gid] A task in the project to insert the task after, or `null` to
       # insert at the beginning of the list.
@@ -393,8 +394,10 @@ def projects(per_page: 20, options: {})
       #
       # options - [Hash] the request I/O options.
       # data - [Hash] the attributes to post.
-      def add_project(project: required("project"), insert_after: nil, insert_before: nil, section: nil, options: {}, **data)
-        with_params = data.merge(project: project, insert_after: insert_after, insert_before: insert_before, section: section).reject { |_,v| v.nil? || Array(v).empty? }
+      def add_project(project: required("project"), insert_after: :not_provided, insert_before: :not_provided, section: nil, options: {}, **data)
+        with_params = data.merge(project: project, insert_after: insert_after, insert_before: insert_before, section: section).reject { |_,v| v.nil? || Array(v).empty? || v == :not_provided }
+        with_params[:insert_after] = nil if insert_after.nil?
+        with_params[:insert_before] = nil if insert_before.nil?
         client.post("/tasks/#{gid}/addProject", body: with_params, options: options) && true
       end
 
@@ -475,6 +478,7 @@ def add_subtask(options: {}, **data)
       # data - [Hash] the attributes to post.
       def set_parent(parent: required("parent"), insert_after: nil, insert_before: nil, options: {}, **data)
         with_params = data.merge(parent: parent, insert_after: insert_after, insert_before: insert_before).reject { |_,v| v.nil? || Array(v).empty? }
+        with_params[:parent] = nil if parent.nil?
         client.post("/tasks/#{gid}/setParent", body: with_params, options: options) && true
       end