diff --git a/CHANGES.rst b/CHANGES.rst
index b41a623b1c..b0f2ef9899 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -41,7 +41,7 @@ Features Added
     - Acquisition = 4.3.0
     - BTrees = 4.4.1
     - DocumentTemplate = 3.0a1
-    - ExtensionClass = 4.2.1
+    - ExtensionClass = 4.3.0
     - Persistence = 3.0a3
     - persistent = 4.2.2
     - Products.ZCatalog = 4.0a3
diff --git a/requirements-full.txt b/requirements-full.txt
index 6a5e9dfbcc..e39ed2dc9e 100644
--- a/requirements-full.txt
+++ b/requirements-full.txt
@@ -6,7 +6,7 @@ BTrees==4.4.1
 Chameleon==2.25
 DateTime==4.1.1
 DocumentTemplate==3.0a1
-ExtensionClass==4.2.1
+ExtensionClass==4.3.0
 Missing==3.1
 MultiMapping==3.0
 PasteDeploy==1.5.2
diff --git a/versions-prod.cfg b/versions-prod.cfg
index 5961dc39a6..1bb99c2eeb 100644
--- a/versions-prod.cfg
+++ b/versions-prod.cfg
@@ -9,7 +9,7 @@ BTrees = 4.4.1
 Chameleon = 2.25
 DateTime = 4.1.1
 DocumentTemplate = 3.0a1
-ExtensionClass = 4.2.1
+ExtensionClass = 4.3.0
 five.globalrequest = 1.0
 funcsigs = 1.0.2
 mock = 2.0.0