diff --git a/Gemfile b/Gemfile
index 107b5164..001be4b2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,7 +10,7 @@ gem "minitest", "5.15.0"
 gem "rake-compiler", "~> 1.3.0" # Small bug in 1.2.4 that breaks Ruby 2.5
 gem "rake-compiler-dock", "1.9.1" # This should match the versions used in docker/Dockerfile.*
 gem "racc", "~> 1.7"
-gem "base64", "~> 0.2.0"
+gem "base64", "~> 0.3.0"
 gem "yard"
 gem "mutex_m"