diff --git a/ext/syslog/syslog.gemspec b/ext/syslog/syslog.gemspec
index 788fd2da95..1964e422a0 100644
--- a/ext/syslog/syslog.gemspec
+++ b/ext/syslog/syslog.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |spec|
   spec.summary       = %q{Ruby interface for the POSIX system logging facility.}
   spec.description   = %q{Ruby interface for the POSIX system logging facility.}
   spec.homepage      = "https://github.com/ruby/syslog"
-  spec.required_ruby_version = Gem::Requirement.new(">= 2.3.0")
+  spec.required_ruby_version = Gem::Requirement.new(">= 2.5.0")
   spec.licenses      = ["Ruby", "BSD-2-Clause"]
 
   spec.metadata["homepage_uri"] = spec.homepage