diff --git a/Gemfile.lock b/Gemfile.lock
index eb2e2766f..aad4e4c5f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -22,7 +22,7 @@ GIT
 PATH
   remote: .
   specs:
-    rbs (4.0.1.dev.1)
+    rbs (4.0.1.dev.2)
       logger
       prism (>= 1.6.0)
       tsort
diff --git a/lib/rbs/version.rb b/lib/rbs/version.rb
index 2380170fd..a190d7221 100644
--- a/lib/rbs/version.rb
+++ b/lib/rbs/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module RBS
-  VERSION = "4.0.1.dev.1"
+  VERSION = "4.0.1.dev.2"
 end
diff --git a/rbs.gemspec b/rbs.gemspec
index e0a49af17..05ed56874 100644
--- a/rbs.gemspec
+++ b/rbs.gemspec
@@ -30,8 +30,8 @@ Gem::Specification.new do |spec|
   spec.files         = Dir.chdir(File.expand_path('..', __FILE__)) do
     `git ls-files -z`.split("\x0").reject do |f|
       [
-        %r{^(test|spec|features|bin|steep|benchmark|templates)/},
-        /Gemfile/
+        %r{^(test|spec|features|bin|steep|benchmark|templates|rust)/},
+        /Gemfile/,
       ].any? {|r| f.match(r) }
     end
   end