diff --git a/.circleci/config.yml b/.circleci/config.yml
index 738ee91..95ef2ff 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -22,12 +22,6 @@ default: &default-steps
 
 # Enumerated list of Emacs versions
 jobs:
-  test-emacs-24:
-    docker:
-      - image: silex/emacs:24
-        entrypoint: bash
-    <<: *default-steps
-
   test-emacs-25:
     docker:
       - image: silex/emacs:25
@@ -51,7 +45,6 @@ workflows:
   version: 2
   ci-test-matrix:
     jobs:
-      - test-emacs-24
       - test-emacs-25
       - test-emacs-26
       - test-emacs-master
diff --git a/plantuml-mode.el b/plantuml-mode.el
index 5455075..bf11586 100644
--- a/plantuml-mode.el
+++ b/plantuml-mode.el
@@ -2,11 +2,12 @@
 
 ;; Filename: plantuml-mode.el
 ;; Description: Major mode for PlantUML diagrams sources
-;; Compatibility: Tested with Emacs 24.3 through 24.5 on OS X 10.10
+;; Compatibility: Tested with Emacs 25 through 27 (current master)
 ;; Author: Zhang Weize (zwz)
 ;; Maintainer: Carlo Sciolla (skuro)
 ;; Keywords: uml plantuml ascii
 ;; Version: 1.2.6
+;; Package-Requires: ((emacs "25.0"))
 
 ;; This file is free software; you can redistribute it and/or modify
 ;; it under the terms of the GNU General Public License as published by