diff --git a/Gemfile.lock b/Gemfile.lock
index 82137104..f852b554 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -642,9 +642,9 @@ GEM
       railties (>= 4.1.0)
       responders
       warden (~> 1.2.3)
-    devise_invitable (1.7.5)
-      actionmailer (>= 4.1.0)
-      devise (>= 4.0.0)
+    devise_invitable (2.0.2)
+      actionmailer (>= 5.0)
+      devise (>= 4.6)
     diff-lcs (1.3)
     docile (1.1.5)
     dotenv (0.11.1)
@@ -758,7 +758,7 @@ GEM
     pry-rails (0.3.2)
       pry (>= 0.9.10)
     public_suffix (4.0.5)
-    rack (2.1.1)
+    rack (2.2.2)
     rack-test (0.6.3)
       rack (>= 1.0)
     rack-timeout (0.0.4)
@@ -798,9 +798,9 @@ GEM
       mail
     redcarpet (3.4.0)
     regexp_parser (1.6.0)
-    responders (2.4.1)
-      actionpack (>= 4.2.0, < 6.0)
-      railties (>= 4.2.0, < 6.0)
+    responders (3.0.1)
+      actionpack (>= 5.0)
+      railties (>= 5.0)
     rspec-core (3.8.0)
       rspec-support (~> 3.8.0)
     rspec-expectations (3.8.2)
@@ -874,8 +874,8 @@ GEM
     unicorn (5.3.1)
       kgio (~> 2.6)
       raindrops (~> 0.7)
-    warden (1.2.7)
-      rack (>= 1.0)
+    warden (1.2.8)
+      rack (>= 2.0.6)
     webmock (1.18.0)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)