diff --git a/Gemfile.lock b/Gemfile.lock
index fc268eac35b..c206b591b81 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -127,7 +127,7 @@ GEM
     hiredis (0.4.5)
     httpauth (0.2.0)
     i18n (0.6.9)
-    image_optim (0.11.0)
+    image_optim (0.9.1)
       exifr (~> 1.1.3)
       fspath (~> 2.1.0)
       image_size (~> 1.2.0)