diff --git a/Gemfile.lock b/Gemfile.lock
index d9c3e199..e04eba8d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -108,7 +108,7 @@ GEM
     debug_inspector (1.1.0)
     diff-lcs (1.5.0)
     diffy (3.4.0)
-    digest (3.1.0)
+    digest (3.0.0)
     discourse-ember-rails (0.18.6)
       active_model_serializers
       ember-data-source (>= 1.0.0.beta.5)
@@ -264,7 +264,7 @@ GEM
       timeout
     net-protocol (0.1.3)
       timeout
-    net-smtp (0.3.1)
+    net-smtp (0.2.2)
       digest
       net-protocol
       timeout
@@ -371,7 +371,10 @@ GEM
       msgpack (>= 0.4.3)
       optimist (>= 3.0.0)
     rchardet (1.8.0)
-    redis (4.5.1)
+    redis (5.0.6)
+      redis-client (>= 0.9.0)
+    redis-client (0.12.1)
+      connection_pool
     redis-namespace (1.8.2)
       redis (>= 3.0.4)
     regexp_parser (2.5.0)
@@ -538,6 +541,7 @@ DEPENDENCIES
   cppjieba_rb
   css_parser
   diffy
+  digest (= 3.0.0)
   discourse-ember-rails (= 0.18.6)
   discourse-ember-source (~> 3.12.2)
   discourse-fonts
@@ -582,6 +586,9 @@ DEPENDENCIES
   multi_json
   mustache
   net-http
+  net-imap (~> 0.2.1)
+  net-pop (~> 0.1.1)
+  net-smtp (~> 0.2.1)
   nokogiri
   oj
   omniauth