diff --git a/just-the-docs.gemspec b/just-the-docs.gemspec
index adafd47c17a07a1ce071f74c3ade561cd4e48ed7..d5c951a7e3ccb01760aef6702848f2213c1c0d6d 100644
--- a/just-the-docs.gemspec
+++ b/just-the-docs.gemspec
@@ -16,7 +16,7 @@ Gem::Specification.new do |spec|
     "source_code_uri"   => "https://github.com/just-the-docs/just-the-docs",
   }
 
-  spec.files         = `git ls-files -z`.split("\x0").select { |f| f.match(%r{^(assets|bin|_layouts|_includes|lib|Rakefile|_sass|LICENSE|README|CHANGELOG|favicon)}i) }
+  spec.files         = `git ls-files -z ':!:*.jpg' ':!:*.png'`.split("\x0").select { |f| f.match(%r{^(assets|bin|_layouts|_includes|lib|Rakefile|_sass|LICENSE|README|CHANGELOG|favicon)}i) }
   spec.executables   << 'just-the-docs'
 
   spec.add_development_dependency "bundler", "~> 2.3.5"