diff --git a/Gemfile b/Gemfile
index bf83ba86..dc34af78 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ source "https://rubygems.org"
 
 gem "byebug", "~> 11.0", platforms: %i[mri mingw x64_mingw]
 gem "chunky_png", "~> 1.3"
-gem "image_size", "~> 2.0"
+gem "image_size", "~> 3.3"
 gem "kramdown", "~> 2.0", require: false
 gem "pdf-reader", "~> 2.2"
 gem "puma", "~> 4.1"