diff --git a/Gemfile.lock b/Gemfile.lock
index 8369f88..2ae427e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,7 +3,7 @@ PATH
   specs:
     puffing-billy (0.8.0)
       addressable
-      em-http-request (~> 1.1.0)
+      em-http-request (= 1.1.3)
       em-synchrony
       eventmachine (~> 1.0.4)
       eventmachine_httpserver
@@ -152,4 +152,4 @@ DEPENDENCIES
   thin
 
 BUNDLED WITH
-   1.11.2
+   1.12.5
diff --git a/puffing-billy.gemspec b/puffing-billy.gemspec
index 2609f79..febbb34 100644
--- a/puffing-billy.gemspec
+++ b/puffing-billy.gemspec
@@ -30,7 +30,8 @@ Gem::Specification.new do |gem|
   gem.add_runtime_dependency 'addressable'
   gem.add_runtime_dependency 'eventmachine', '~> 1.0.4'
   gem.add_runtime_dependency 'em-synchrony'
-  gem.add_runtime_dependency 'em-http-request', '~> 1.1.0'
+  # Pinning to 1.1.3 due to https://github.com/oesmith/puffing-billy/issues/164
+  gem.add_runtime_dependency 'em-http-request', '= 1.1.3'
   gem.add_runtime_dependency 'eventmachine_httpserver'
   gem.add_runtime_dependency 'http_parser.rb', '~> 0.6.0'
   gem.add_runtime_dependency 'multi_json'