diff --git a/lib/onfleet/api_category.rb b/lib/onfleet/api_category.rb
index 40055a0..ea35363 100644
--- a/lib/onfleet/api_category.rb
+++ b/lib/onfleet/api_category.rb
@@ -35,7 +35,7 @@ def call(method, params = {})
     def send_api_request(method, params)
       begin
         Onfleet::API.logger.info "Try Count: #{ @try_count } Start Onfleet API Request #{ @api_url }"
-        response = HTTParty.send(method, @api_url, :body => MultiJson.dump(params), basic_auth: { username: @api_key }, :timeout => @timeout)
+        response = HTTParty.send(method, @api_url, :body => MultiJson.dump(params), basic_auth: { username: @api_key }, headers: { 'Content-Type' => 'application/json' }, :timeout => @timeout)
         Onfleet::API.logger.info "Try Count: #{ @try_count } End Onfleet API Request Response Code: #{response.code}"
         raise OnfleetError, 'Retrying TooManyRequestsError Response Code: 429' if (response.code == 429 && should_retry_if_fails?)
         return response
diff --git a/lib/onfleet/version.rb b/lib/onfleet/version.rb
index f20ad5f..dbbad8f 100644
--- a/lib/onfleet/version.rb
+++ b/lib/onfleet/version.rb
@@ -1,3 +1,3 @@
 module Onfleet
-  VERSION = "1.0.1"
+  VERSION = "1.0.2"
 end