diff --git a/CHANGELOG.md b/CHANGELOG.md
index 434b7725..b7129866 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,15 @@
+# 4.0.0
+
+* Add tests for US Core 6.1.0.
+* Update the terminology build process for US Core 6.1.0. It is necessary to
+  rerun the terminology build with this release.
+* CapabilityStatement tests now check that the server lists support for for all
+  required US Core profiles rather than only for all required USCDI resources
+  when using US Core 4, 5, or 6 (tests 5.1.05, 6.1.05, and 10.1.05)(#462).
+* Medication inclusion searches now check that all referenced Medication
+  resources are included in the search Bundle rather than only checking that
+  some Medication resources are included (#463).
+
 # 3.8.1
 
 * Add presets for the US Core Test Suites so that they will be available for
diff --git a/Gemfile.lock b/Gemfile.lock
index c077b89e..ec8ae7d3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    onc_certification_g10_test_kit (4.0.0.rc1)
+    onc_certification_g10_test_kit (4.0.0)
       bloomer (~> 1.0.0)
       colorize (~> 0.8.1)
       inferno_core (~> 0.4.20)
diff --git a/lib/onc_certification_g10_test_kit/version.rb b/lib/onc_certification_g10_test_kit/version.rb
index e8453c95..2c6c46ce 100644
--- a/lib/onc_certification_g10_test_kit/version.rb
+++ b/lib/onc_certification_g10_test_kit/version.rb
@@ -1,3 +1,3 @@
 module ONCCertificationG10TestKit
-  VERSION = '4.0.0.rc1'.freeze
+  VERSION = '4.0.0'.freeze
 end