diff --git a/CMakeLists.txt b/CMakeLists.txt
index b3f7a67..c331ce6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,7 +12,7 @@ pkg_check_modules(jsoncpp REQUIRED IMPORTED_TARGET jsoncpp)
 find_package(mastodonpp 0.5.4 REQUIRED CONFIG)
 find_package(Filesystem REQUIRED)
 
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
diff --git a/feiertagebot.cpp b/feiertagebot.cpp
index 087313f..3b6116e 100644
--- a/feiertagebot.cpp
+++ b/feiertagebot.cpp
@@ -1,6 +1,7 @@
 // Author: tastytea <tastytea@tastytea.de>
 // CC-0 / Public Domain
 
+#include <mastodonpp/instance.hpp>
 #include <string>
 #include <exception>
 #include <iostream>
@@ -15,8 +16,7 @@
 #include <curlpp/Exception.hpp>
 #include <curlpp/Infos.hpp>
 #include <json/json.h>
-#include <mastodon-cpp/easy/easy.hpp>
-#include <mastodon-cpp/easy/entities/status.hpp>
+#include <mastodonpp/mastodonpp.hpp>
 #include "xdgjson/src/xdgjson.hpp"
 
 namespace curlopts = curlpp::options;
@@ -29,7 +29,7 @@ using std::chrono::system_clock;
 using std::chrono::hours;
 using std::uint_fast16_t;
 
-const string version = "2019-04-20_2";
+const string version = "2020-05-16_1";
 
 struct Holiday
 {
@@ -82,38 +82,30 @@ const string get_date(const system_clock::time_point &timepoint,
 
 const string get_token(const string &instance)
 {
-    Mastodon::API masto(instance, "");
-    Mastodon::return_call ret;
-    string client_id, client_secret, url;
-    string code, access_token;
-    ret = masto.register_app1("feiertagebot",
-                              "urn:ietf:wg:oauth:2.0:oob",
-                              "write:statuses",
-                              "https://schlomp.space/tastytea/feiertagebot",
-                              client_id,
-                              client_secret,
-                              url);
-    if (!ret)
+    mastodonpp::Instance server{instance, ""};
+    mastodonpp::Instance::ObtainToken token{server};
+
+    auto answer{token.step_1("feiertagebot",
+                             "write:statuses",
+                             "https://schlomp.space/tastytea/feiertagebot")};
+    if (!answer)
     {
-        cerr << "Error " << std::to_string(ret.error_code) << endl;
+        cerr << "Error " << answer.error_message << endl;
         return "";
     }
 
-    cout << "Visit " << url << " to authorize this application.\n";
+    string code;
+    cout << "Visit " << answer << " to authorize this application.\n";
     cout << "Insert code: ";
     std::getline(std::cin, code);
-    ret = masto.register_app2(client_id,
-                              client_secret,
-                              "urn:ietf:wg:oauth:2.0:oob",
-                              code,
-                              access_token);
-    if (!ret)
+    answer = token.step_2(code);
+    if (!answer)
     {
-        cerr << "Error " << std::to_string(ret.error_code) << endl;
+        cerr << "Error " << answer.error_message << endl;
         return "";
     }
 
-    return access_token;
+    return answer.body;
 }
 
 int main()
@@ -213,16 +205,15 @@ int main()
 
         if (!output.empty())
         {
-            Mastodon::Easy::return_entity<Mastodon::Easy::Status> ret;
-            Mastodon::Easy::API masto(instance, access_token);
-            masto.exceptions(true);
-            Mastodon::Easy::Status status;
-            status.content(output + "#bot");
-            ret = masto.send_post(status);
-            if (!ret)
+            mastodonpp::Instance server{instance, access_token};
+            mastodonpp::Connection connection{server};
+            string status{output + "#bot"};
+            const auto answer{connection.post(mastodonpp::API::v1::statuses,
+                                              {{"status", output}})};
+            if (!answer)
             {
-                cerr << "Error " << std::to_string(ret.error_code) << endl;
-                return ret.error_code;
+                cerr << "Error " << answer.error_message << endl;
+                return answer.curl_error_code;
             }
         }
     }