diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3c7dab0..e6d5ef0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+# 0.5.19
+
+* introduced PATCH requests.
+* brought back ruby < 2.1 compatibility. Process::CLOCK_MONOTONIC is not present until ruby 2.2. There was a breaking change since 0.5.16.
+
 # 0.5.18
 
 * pass along the caller to each `connection` hook
diff --git a/lib/api_client/version.rb b/lib/api_client/version.rb
index 399bcad..c42da4c 100644
--- a/lib/api_client/version.rb
+++ b/lib/api_client/version.rb
@@ -1,3 +1,3 @@
 module ApiClient
-  VERSION = "0.5.18"
+  VERSION = "0.5.19"
 end