diff --git a/Gemfile.lock b/Gemfile.lock
index 2479ec1..8f0c2b1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     middleman-images (0.2.0)
-      middleman-core (>= 4.1.14)
+      middleman-core (>= 4.1.14, < 5.1)
 
 GEM
   remote: https://rubygems.org/
@@ -121,12 +121,13 @@ GEM
       uglifier (~> 3.0)
     mini_magick (4.10.1)
     mini_mime (1.0.2)
-    mini_portile2 (2.4.0)
+    mini_portile2 (2.6.1)
     minitest (5.14.0)
     multi_json (1.14.1)
     multi_test (0.1.2)
-    nokogiri (1.10.8)
-      mini_portile2 (~> 2.4.0)
+    nokogiri (1.12.5)
+      mini_portile2 (~> 2.6.1)
+      racc (~> 1.4)
     padrino-helpers (0.13.3.4)
       i18n (~> 0.6, >= 0.6.7)
       padrino-support (= 0.13.3.4)
@@ -136,6 +137,7 @@ GEM
     parallel (1.19.1)
     progress (3.5.2)
     public_suffix (4.0.3)
+    racc (1.5.2)
     rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)