diff --git a/Gemfile.lock b/Gemfile.lock
index 7888a0c..b6913dc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -320,18 +320,18 @@ GEM
     hashie (5.0.0)
     hike (1.2.3)
     htmlentities (4.3.4)
-    httparty (0.20.0)
-      mime-types (~> 3.0)
+    httparty (0.21.0)
+      mini_mime (>= 1.0.0)
       multi_xml (>= 0.5.2)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    image_optim (0.24.2)
+    image_optim (0.31.2)
       exifr (~> 1.2, >= 1.2.2)
       fspath (~> 3.0)
-      image_size (~> 1.5)
+      image_size (>= 1.5, < 4)
       in_threads (~> 1.3)
       progress (~> 3.0, >= 3.0.1)
-    image_size (1.5.0)
+    image_size (3.2.0)
     in_threads (1.6.0)
     innertube (1.1.0)
     jbuilder (1.0.2)
@@ -576,7 +576,7 @@ DEPENDENCIES
   friendly_id_pack!
   gibbon (= 1.1.5)
   haml (= 4.0.5)
-  image_optim (= 0.24.2)
+  image_optim (= 0.31.2)
   image_tools!
   jbuilder (= 1.0.2)
   jquery-rails (= 4.0.4)