diff --git a/Gemfile.lock b/Gemfile.lock
index 82ea74b..00e2480 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -25,15 +25,6 @@ GIT
   specs:
     state_machine (1.2.0)
 
-GIT
-  remote: https://github.com/deees/puma-plugin-systemd.git
-  revision: e3b7fc94041c8b437866bbda7880ac09a3dcd229
-  branch: puma-4
-  specs:
-    puma-plugin-systemd (0.1.1)
-      json
-      puma (>= 3.6)
-
 GIT
   remote: https://github.com/gregbell/active_admin.git
   revision: e84c6e541db5ec95ee50455015ca8644a1240b47
@@ -120,8 +111,8 @@ GEM
       tzinfo (~> 1.1)
     acts-as-taggable-on (7.0.0)
       activerecord (>= 5.0, < 6.2)
-    addressable (2.7.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     airbrussh (1.4.0)
       sshkit (>= 1.6.1, != 1.7.0)
     ansi (1.5.0)
@@ -427,7 +418,7 @@ GEM
     pry-byebug (3.9.0)
       byebug (~> 11.0)
       pry (~> 0.13.0)
-    public_suffix (4.0.6)
+    public_suffix (5.0.0)
     puma (5.1.1)
       nio4r (~> 2.0)
     racc (1.5.2)
@@ -683,7 +674,6 @@ DEPENDENCIES
   pry
   pry-byebug
   puma
-  puma-plugin-systemd!
   rails (~> 5.2)
   rb-fsevent (~> 0.9.1)
   rb-inotify (~> 0.9)