diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5e18859..076a46d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+# 0.6.4 (2020-09-22)
+
+### Added
+Pin gevent to version 20.6.2
+Pin greenlet to version 0.4.16
+
 # 0.6.3 (2020-05-27)
 
 ### Added
diff --git a/setup.py b/setup.py
index cb925e0..6a347e2 100755
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 
 setup(
     name="canonicalwebteam.flask-base",
-    version="0.6.3",
+    version="0.6.4",
     description=(
         "Flask extension that applies common configurations"
         "to all of webteam's flask apps."
@@ -20,7 +20,8 @@
     install_requires=[
         "canonicalwebteam.yaml-responses[flask] (>=1,<2)",
         "flask (>=1,<2)",
-        "gevent==20.6.1",
+        "gevent==20.6.2",
+        "greenlet==0.4.16",
         "talisker[gunicorn,gevent,flask,prometheus,raven] (>=0.18)",
         "Werkzeug (>=0.15,<0.16)",
     ],