diff --git a/.dir-locals.el b/.dir-locals.el
new file mode 100644
index 00000000..f3f3a384
--- /dev/null
+++ b/.dir-locals.el
@@ -0,0 +1 @@
+((emacs-lisp-mode (package-lint-main-file . "php-mode.el")))
diff --git a/Cask b/Cask
index 49af2fb6..a37bc60b 100644
--- a/Cask
+++ b/Cask
@@ -1,11 +1,13 @@
 (package "php-mode" "1.23.0" "Major mode for editing PHP code")
 (source melpa)
 
-(package-file "php.el")
-(package-file "php-face.el")
 (package-file "php-mode.el")
-(package-file "php-project.el")
-(package-file "php-mode-debug.el")
+
+(files
+ "php.el"
+ "php-face.el"
+ "php-project.el"
+ "php-mode-debug.el")
 
 (development
  (depends-on "pkg-info")
diff --git a/lisp/php-local-manual.el b/lisp/php-local-manual.el
index effb41de..6601ed65 100644
--- a/lisp/php-local-manual.el
+++ b/lisp/php-local-manual.el
@@ -7,7 +7,6 @@
 ;; URL: https://github.com/emacs-php/php-mode
 ;; Keywords: docs, php
 ;; Version: 2.0.0
-;; Package-Requires: ((emacs "25.2"))
 ;; License: GPL-3.0-or-later
 
 ;; This program is free software; you can redistribute it and/or modify
diff --git a/php-align.el b/php-align.el
index 084f8857..648ceac0 100644
--- a/php-align.el
+++ b/php-align.el
@@ -8,7 +8,6 @@
 ;; Keywords: php languages convenience align
 ;; Homepage: https://github.com/emacs-php/php-mode
 ;; Version: 1.23.0
-;; Package-Requires: ((emacs "24.3"))
 ;; License: GPL-3.0-or-later
 
 ;; This program is free software; you can redistribute it and/or modify
diff --git a/php-face.el b/php-face.el
index cb6a95f9..ac6f48da 100644
--- a/php-face.el
+++ b/php-face.el
@@ -7,7 +7,6 @@
 ;; Version: 1.23.0
 ;; Keywords: faces, php
 ;; Homepage: https://github.com/emacs-php/php-mode
-;; Package-Requires: ((emacs "24.3"))
 ;; License: GPL-3.0-or-later
 
 ;; This program is free software; you can redistribute it and/or modify
diff --git a/php-mode-debug.el b/php-mode-debug.el
index 1e75aa15..01f02a04 100644
--- a/php-mode-debug.el
+++ b/php-mode-debug.el
@@ -6,7 +6,6 @@
 ;; URL: https://github.com/emacs-php/php-mode
 ;; Keywords: maint
 ;; Version: 1.23.0
-;; Package-Requires: ((emacs "24.3"))
 ;; License: GPL-3.0-or-later
 
 ;; This program is free software; you can redistribute it and/or modify
diff --git a/php-project.el b/php-project.el
index 6e305a7b..5f4236d1 100644
--- a/php-project.el
+++ b/php-project.el
@@ -6,7 +6,6 @@
 ;; Keywords: tools, files
 ;; URL: https://github.com/emacs-php/php-mode
 ;; Version: 1.23.0
-;; Package-Requires: ((emacs "24.3"))
 ;; License: GPL-3.0-or-later
 
 ;; This program is free software; you can redistribute it and/or modify
diff --git a/php.el b/php.el
index ce532c17..e417fa18 100644
--- a/php.el
+++ b/php.el
@@ -7,7 +7,6 @@
 ;; Version: 1.23.0
 ;; Keywords: languages, php
 ;; Homepage: https://github.com/emacs-php/php-mode
-;; Package-Requires: ((emacs "24.3"))
 ;; License: GPL-3.0-or-later
 
 ;; This program is free software; you can redistribute it and/or modify
diff --git a/tests/.dir-locals.el b/tests/.dir-locals.el
new file mode 100644
index 00000000..d18ca3ff
--- /dev/null
+++ b/tests/.dir-locals.el
@@ -0,0 +1 @@
+((emacs-lisp-mode (package-lint-main-file . "../php-mode.el")))