diff --git a/packages/rn-tester/Gemfile b/packages/rn-tester/Gemfile
index 03087ee0ccd9e2..c8b1aad6c2f3fa 100644
--- a/packages/rn-tester/Gemfile
+++ b/packages/rn-tester/Gemfile
@@ -16,3 +16,6 @@ gem 'bigdecimal'
 gem 'logger'
 gem 'benchmark'
 gem 'mutex_m'
+gem 'nkf'
+gem 'base64'
+
diff --git a/private/helloworld/Gemfile b/private/helloworld/Gemfile
index 3c74e524b637d0..4fbe0d436d40c7 100644
--- a/private/helloworld/Gemfile
+++ b/private/helloworld/Gemfile
@@ -12,5 +12,8 @@ gem 'bigdecimal'
 gem 'logger'
 gem 'benchmark'
 gem 'mutex_m'
+gem 'nkf'
+gem 'base64'
+
 gem 'ffi',  '>= 1.17.2'
 gem 'rexml', '>= 3.3.9'