diff --git a/lib/smith.rb b/lib/smith.rb
index cf1239c..cf48972 100644
--- a/lib/smith.rb
+++ b/lib/smith.rb
@@ -8,8 +8,7 @@
 require 'fileutils'
 require 'multi_json'
 require 'securerandom'
-require 'extlib/string'
-require 'extlib/inflection'
+require 'inflecto'
 require 'daemons/pidfile'
 
 require 'smith/config'
diff --git a/lib/smith/agent_process.rb b/lib/smith/agent_process.rb
index 04e6edc..81d85fa 100644
--- a/lib/smith/agent_process.rb
+++ b/lib/smith/agent_process.rb
@@ -190,7 +190,7 @@ def self.start_process(agent_process)
 
         bootstrapper = Pathname.new(__FILE__).dirname.join('bootstrap.rb').expand_path
 
-        binary = Smith.config.vm[agent_process.name.snake_case.to_sym] || Smith.config.vm.agent_default
+        binary = Smith.config.vm[Inflecto.undercore(agent_process.name).to_sym] || Smith.config.vm.agent_default
         logger.debug { "Launching #{agent_process.name} with: #{binary}" }
         exec(binary, bootstrapper.to_s, agent_process.name, agent_process.uuid)
       end
diff --git a/lib/smith/command.rb b/lib/smith/command.rb
index 09316d3..58ba84d 100644
--- a/lib/smith/command.rb
+++ b/lib/smith/command.rb
@@ -20,7 +20,7 @@ def self.run(command, args, vars)
       command = command.gsub(/-/, '_')
       load_command(command)
 
-      clazz = Commands.const_get(Extlib::Inflection.camelize(command)).new
+      clazz = Commands.const_get(Inflecto.camelize(command)).new
 
       begin
         clazz.parse_options(args)
@@ -49,7 +49,7 @@ def self.load_command(command)
     end
 
     def self.instantiate(command)
-      Commands.const_get(Extlib::Inflection.camelize(command)).new
+      Commands.const_get(Inflecto.camelize(command)).new
     end
 
     # What type of command is it?
diff --git a/lib/smith/commands/smithctl/acl.rb b/lib/smith/commands/smithctl/acl.rb
index f3a9537..93248fc 100644
--- a/lib/smith/commands/smithctl/acl.rb
+++ b/lib/smith/commands/smithctl/acl.rb
@@ -1,7 +1,5 @@
 # -*- encoding: utf-8 -*-
 
-require 'extlib/string'
-
 module Smith
   module Commands
     class Acl < CommandBase
@@ -57,7 +55,7 @@ def _acl
       def find_acl(directories, acl, ext)
         [directories].flatten.inject([]) do |a, directory|
           a.tap do |acc|
-            acl_file =  directory.join("#{acl.snake_case}.#{ext}")
+            acl_file =  directory.join("#{Inflecto.underscore(acl)}.#{ext}")
             acc << acl_file if acl_file.exist?
           end
         end
diff --git a/lib/smith/logger.rb b/lib/smith/logger.rb
index f54fe13..5f914a3 100644
--- a/lib/smith/logger.rb
+++ b/lib/smith/logger.rb
@@ -36,7 +36,7 @@ def log_level(level=nil)
 
       def log_appender
         unless @@appender
-          appender_type = Extlib::Inflection.camelize(Config.get.logging.appender.type)
+          appender_type = Inflecto.camelize(Config.get.logging.appender.type)
           pattern_opts = {
             :pattern => Config.get.logging.default_pattern,
             :date_pattern => Config.get.logging.default_date_pattern}
diff --git a/lib/smith/messaging/acl_type_cache.rb b/lib/smith/messaging/acl_type_cache.rb
index 005fa79..e7e1a76 100644
--- a/lib/smith/messaging/acl_type_cache.rb
+++ b/lib/smith/messaging/acl_type_cache.rb
@@ -1,7 +1,6 @@
 # -*- encoding: utf-8 -*-
 
 require 'set'
-require 'extlib'
 require 'singleton'
 require 'murmurhash3'
 
@@ -30,7 +29,8 @@ def add(type)
           @hashes[format][h] = type
         end
 
-        @legacy_types_by_hash[type.to_s.split(/::/)[-1].snake_case] = type
+        # TODO: would Inflecto::demodulize work here instead?
+        @legacy_types_by_hash[Inflecto.underscore(type.to_s.split(/::/)[-1])] = type
         true
       end
     end
diff --git a/lib/smith/utils.rb b/lib/smith/utils.rb
index 20e8fc1..782eca0 100644
--- a/lib/smith/utils.rb
+++ b/lib/smith/utils.rb
@@ -20,7 +20,7 @@ def agent_directories(name)
     # @param clazz [String] the fully qualified class.
     # @@return [Pathname] the path
     def path_from_class(root, clazz)
-      parts = clazz.split(/::/).map(&:snake_case)
+      parts = clazz.split(/::/).map { |part| Inflecto.underscore(part) }
       parts[-1] = "#{parts[-1]}.rb"
       Pathname.new(root).join(*parts)
     end
diff --git a/smith.gemspec b/smith.gemspec
index 9a6dc54..cc51280 100644
--- a/smith.gemspec
+++ b/smith.gemspec
@@ -16,7 +16,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'addressable', '~> 2.0'
   s.add_runtime_dependency 'daemons', '~> 1.1'
   s.add_runtime_dependency "eventmachine", "~> 1.0"
-  s.add_runtime_dependency "extlib", "0.9.16"
+  s.add_runtime_dependency "inflecto", "~> 0.0.2"
   s.add_runtime_dependency "logging", "~> 2.0"
   s.add_runtime_dependency 'protobuf', '~> 3.4'
   s.add_runtime_dependency "state_machine", "1.1.2"