diff --git a/lisp/progmodes/ruby-mode.el b/lisp/progmodes/ruby-mode.el
index 0c54a1d27a..a48879bfe6 100644
--- a/lisp/progmodes/ruby-mode.el
+++ b/lisp/progmodes/ruby-mode.el
@@ -2421,6 +2421,15 @@ ruby-flymake-auto
    report-fn
    args))
 
+(defconst ruby--prettify-symbols-alist
+  '(("and" . ?∧)
+    ("&&" . ?∧)
+    ("or" . ?∨)
+    ("||" . ?∨)
+    ("<=" . ?≤)
+    (">=" . ?≥))
+  "Value for `prettify-symbols-alist' in `ruby-mode'.")
+
 ;;;###autoload
 (define-derived-mode ruby-mode prog-mode "Ruby"
   "Major mode for editing Ruby code."
@@ -2437,6 +2446,7 @@ ruby-mode
 
   (setq-local font-lock-defaults '((ruby-font-lock-keywords) nil nil
                                    ((?_ . "w"))))
+  (setq-local prettify-symbols-alist ruby--prettify-symbols-alist)
 
   (setq-local syntax-propertize-function #'ruby-syntax-propertize))