diff --git a/CHANGELOG.md b/CHANGELOG.md
index bcb5db29..20584029 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Change Log
 
+### 4.0.0
+
+* Raise when `KNAPSACK_PRO_CI_NODE_BUILD_ID` is missing
+
+    https://github.com/KnapsackPro/knapsack_pro-ruby/pull/195
+
+https://github.com/KnapsackPro/knapsack_pro-ruby/compare/v3.11.0...v4.0.0
+
 ### 3.11.0
 
 * Send distinguishable user seat info over to the API
diff --git a/lib/knapsack_pro/version.rb b/lib/knapsack_pro/version.rb
index eeb35e64..e424f159 100644
--- a/lib/knapsack_pro/version.rb
+++ b/lib/knapsack_pro/version.rb
@@ -1,3 +1,3 @@
 module KnapsackPro
-  VERSION = '3.11.0'
+  VERSION = '4.0.0'
 end