diff --git a/lib/github_changelog_generator/octo_fetcher.rb b/lib/github_changelog_generator/octo_fetcher.rb
index 6d0db33..c76affe 100644
--- a/lib/github_changelog_generator/octo_fetcher.rb
+++ b/lib/github_changelog_generator/octo_fetcher.rb
@@ -318,7 +318,7 @@ Make sure, that you push tags to remote repo via 'git push --tags'"
     # @param [Integer] attempt the attempt number
     # @return [Integer] Exponential backoff seconds
     def exp_backoff(attempt)
-      (2 ** attempt - 1) / 2
+      (2**attempt - 1) / 2
     end
 
     # Print specified line on the same string
diff --git a/spec/unit/octo_fetcher_spec.rb b/spec/unit/octo_fetcher_spec.rb
index 14dd244..7a254b4 100644
--- a/spec/unit/octo_fetcher_spec.rb
+++ b/spec/unit/octo_fetcher_spec.rb
@@ -15,7 +15,7 @@ describe GitHubChangelogGenerator::OctoFetcher do
   describe "#check_github_response" do
     context "when returns successfully" do
       it "returns block value" do
-        expect(fetcher.send(:check_github_response) { 1+1 }).to eq(2)
+        expect(fetcher.send(:check_github_response) { 1 + 1 }).to eq(2)
       end
     end
 
@@ -35,7 +35,6 @@ describe GitHubChangelogGenerator::OctoFetcher do
         fetcher.send(:check_github_response) { raise(Octokit::Forbidden) }
       end
     end
-
   end
 
   describe "#fetch_github_token" do