diff --git a/README.md b/README.md
index 0ed6683..f7d84d3 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,7 @@ Get Zulip notifications for your Redmine issues!
 | 1.x                          | 3.x             |
 | 2.x                          | 3.x             |
 | 3.x                          | 4.x             |
+| 4.x                          | 5.x             |
 
 ## Installing
 
diff --git a/init.rb b/init.rb
index 9c1237d..4a5afea 100644
--- a/init.rb
+++ b/init.rb
@@ -1,4 +1,4 @@
-require "redmine_zulip"
+require File.dirname(__FILE__) + "/lib/redmine_zulip"
 
 Redmine::Plugin.register :redmine_zulip do
   name 'Zulip'
diff --git a/lib/redmine_zulip.rb b/lib/redmine_zulip.rb
index 387a9d8..26aeb71 100644
--- a/lib/redmine_zulip.rb
+++ b/lib/redmine_zulip.rb
@@ -1,9 +1,6 @@
 module RedmineZulip
   VERSION = "3.1.2"
 end
-
-Rails.configuration.to_prepare do
-  Issue.send(:include, RedmineZulip::IssuePatch)
-  Project.send(:include, RedmineZulip::ProjectPatch)
-  ProjectsController.send(:helper, RedmineZulip::ProjectSettingsTabs)
-end
+Issue.send(:include, RedmineZulip::IssuePatch)
+Project.send(:include, RedmineZulip::ProjectPatch)
+ProjectsController.send(:helper, RedmineZulip::ProjectSettingsTabs)
diff --git a/lib/redmine_zulip/issue_patch.rb b/lib/redmine_zulip/issue_patch.rb
index d3a0a64..0a672ef 100644
--- a/lib/redmine_zulip/issue_patch.rb
+++ b/lib/redmine_zulip/issue_patch.rb
@@ -112,7 +112,7 @@ def zulip_api
     def notify_assignment
       locale = assigned_to.language.present? ?
                  assigned_to.language : Setting.default_language
-      message = I18n.t("zulip_notify_assignment", {
+      message = I18n.t("zulip_notify_assignment", **{
         locale: locale,
         user: User.current.name,
         id: id,
@@ -144,7 +144,7 @@ def notify_unassignment
       )
       locale = previous_assigned_to.language.present? ?
                  previous_assigned_to.language : Setting.default_language
-      message = I18n.t("zulip_notify_unassignment", {
+      message = I18n.t("zulip_notify_unassignment", **{
         user: User.current.name,
         id: id,
         url: url,
@@ -162,7 +162,7 @@ def notify_unassignment
     def notify_assigned_to_issue_updated
       locale = assigned_to.language.present? ?
                  assigned_to.language : Setting.default_language
-      message = I18n.t("zulip_notify_updated", {
+      message = I18n.t("zulip_notify_updated", **{
         user: User.current.name,
         id: id,
         url: url,
@@ -223,7 +223,7 @@ def notify_assigned_to_issue_updated
     def notify_assigned_to_issue_destroyed
       locale = assigned_to.language.present? ?
                  assigned_to.language : Setting.default_language
-      message = I18n.t("zulip_notify_destroyed", {
+      message = I18n.t("zulip_notify_destroyed", **{
         user: User.current.name,
         id: id,
         project: project.name,
@@ -239,7 +239,7 @@ def notify_assigned_to_issue_destroyed
 
     def init_issue_subject
       locale = Setting.default_language
-      message = I18n.t("zulip_init_issue_subject", {
+      message = I18n.t("zulip_init_issue_subject", **{
         locale: locale,
         user: User.current.name,
         id: id,
@@ -270,7 +270,7 @@ def init_issue_subject
 
     def update_issue_subject
       locale = Setting.default_language
-      message = I18n.t("zulip_notify_updated", {
+      message = I18n.t("zulip_notify_updated", **{
         locale: locale,
         user: User.current.name,
         id: id,
@@ -341,7 +341,7 @@ def update_issue_subject
     end
 
     def update_issue_subject_destroyed
-      message = I18n.t("zulip_notify_destroyed", {
+      message = I18n.t("zulip_notify_destroyed", **{
         locale: Setting.default_language,
         user: User.current.name,
         id: id,
@@ -357,7 +357,7 @@ def update_issue_subject_destroyed
     end
 
     def update_version_subject_added
-      message = I18n.t("zulip_update_version_subject_added", {
+      message = I18n.t("zulip_update_version_subject_added", **{
         locale: Setting.default_language,
         user: User.current.name,
         id: id,
@@ -378,7 +378,7 @@ def update_version_subject_removed
       previous_fixed_version = Version.find(
         previous_changes["fixed_version_id"].first
       )
-      message = I18n.t("zulip_update_version_subject_removed", {
+      message = I18n.t("zulip_update_version_subject_removed", **{
         locale: Setting.default_language,
         user: User.current.name,
         id: id,
@@ -397,7 +397,7 @@ def update_version_subject_removed
 
     def update_version_subject_status
       previous_status_id = previous_changes["status_id"].first
-      message = I18n.t("zulip_update_version_subject_status", {
+      message = I18n.t("zulip_update_version_subject_status", **{
         locale: Setting.default_language,
         user: User.current.name,
         id: id,
@@ -416,7 +416,7 @@ def update_version_subject_status
     end
 
     def update_version_subject_destroyed
-      message = I18n.t("zulip_notify_destroyed", {
+      message = I18n.t("zulip_notify_destroyed", **{
         locale: Setting.default_language,
         user: User.current.name,
         id: id,