diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index aa837317..4c49d1f0 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -20,3 +20,7 @@ jobs:
       run: bundle install
     - name: Run test
       run: rake test
+    - name: Build
+      run: rake build
+      env:
+        LANG: C
diff --git a/lib/net/http.rb b/lib/net/http.rb
index 9e4f9e84..639cb737 100644
--- a/lib/net/http.rb
+++ b/lib/net/http.rb
@@ -656,7 +656,7 @@ class HTTPHeaderSyntaxError < StandardError; end
   # - {:min_version=}[rdoc-ref:Net::HTTP#min_version=]:
   #   Sets the minimum SSL version.
   # - {#peer_cert}[rdoc-ref:Net::HTTP#peer_cert]:
-  #   Returns the X509 certificate chain for the session's socket peer.
+  #   Returns the X509 certificate chain for the session’s socket peer.
   # - {:ssl_version}[rdoc-ref:Net::HTTP#ssl_version]:
   #   Returns the SSL version.
   # - {:ssl_version=}[rdoc-ref:Net::HTTP#ssl_version=]:
diff --git a/net-http.gemspec b/net-http.gemspec
index a7f122fc..b07a0b60 100644
--- a/net-http.gemspec
+++ b/net-http.gemspec
@@ -2,9 +2,14 @@
 
 name = File.basename(__FILE__, ".gemspec")
 version = ["lib", Array.new(name.count("-")+1, "..").join("/")].find do |dir|
-  break File.foreach(File.join(__dir__, dir, "#{name.tr('-', '/')}.rb")) do |line|
-    /^\s*VERSION\s*=\s*"(.*)"/ =~ line and break $1
-  end rescue nil
+  file = File.join(__dir__, dir, "#{name.tr('-', '/')}.rb")
+  begin
+    break File.foreach(file, mode: "rb") do |line|
+      /^\s*VERSION\s*=\s*"(.*)"/ =~ line and break $1
+    end
+  rescue SystemCallError
+    next
+  end
 end
 
 Gem::Specification.new do |spec|
@@ -25,7 +30,7 @@ Gem::Specification.new do |spec|
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
   spec.files         = Dir.chdir(File.expand_path('..', __FILE__)) do
-    `git ls-files -z 2>/dev/null`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
+    `git ls-files -z 2>/dev/null`.split("\x0").reject { |f| f.match(%r{\A(?:(?:test|spec|features)/|\.git)}) }
   end
   spec.bindir        = "exe"
   spec.require_paths = ["lib"]