diff --git a/Gemfile.lock b/Gemfile.lock
index aefdc0a6..d9d64153 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,5 +1,5 @@
 GIT
-  remote: git://github.com/mimemagicrb/mimemagic.git
+  remote: https://github.com/mimemagicrb/mimemagic.git
   revision: 01f92d86d15d85cfd0f20dabd025dcbd36a8a60f
   ref: 01f92d86d15d85cfd0f20dabd025dcbd36a8a60f
   specs:
@@ -69,8 +69,8 @@ GEM
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.7.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     appsignal (2.6.1)
       rack
     arel (8.0.0)
@@ -274,7 +274,7 @@ GEM
     pry (0.11.3)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    public_suffix (4.0.6)
+    public_suffix (5.0.0)
     puma (3.12.0)
     racc (1.5.2)
     rack (2.2.3)