diff --git a/Gemfile.lock b/Gemfile.lock
index 0a52ed5a..09f1ab74 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -110,6 +110,9 @@ GEM
     image_optim_pack (0.6.0)
       fspath (>= 2.1, < 4)
       image_optim (~> 0.19)
+    image_optim_pack (0.6.0-x86_64-linux)
+      fspath (>= 2.1, < 4)
+      image_optim (~> 0.19)
     image_size (2.0.2)
     in_threads (1.5.3)
     io-extra (1.3.0)
@@ -284,6 +287,7 @@ GEM
 
 PLATFORMS
   ruby
+  x86_64-linux
 
 DEPENDENCIES
   acme-client (~> 2.0.0)
@@ -360,4 +364,4 @@ DEPENDENCIES
   zipruby
 
 BUNDLED WITH
-   2.0.2
+   2.1.4