diff --git a/implementations.md b/implementations.md
index 68a1920..218da32 100644
--- a/implementations.md
+++ b/implementations.md
@@ -19,7 +19,7 @@ Here are a list of implementations that live in Fantasy Land:
 * [Pacta](https://github.com/mudge/pacta) is an algebraic implementation of
   Promises that implements Semigroup, Monoid, Functor, Applicative, Chain and
   Monad
-* [Pirandello](http://github.com/quarterto/Pirandello) better streams, with a MonadPlus
+* [Pirandello](https://github.com/quarterto/Pirandello) better streams, with a MonadPlus
 
 Conforming implementations are encouraged to promote the Fantasy Land logo: