diff --git a/acme/_metadata.py b/acme/_metadata.py
index 5eec8ba723..ca26803f1f 100644
--- a/acme/_metadata.py
+++ b/acme/_metadata.py
@@ -21,7 +21,7 @@
 
 # We follow Semantic Versioning (https://semver.org/)
 _MAJOR_VERSION = '0'
-_MINOR_VERSION = '3'
+_MINOR_VERSION = '4'
 _PATCH_VERSION = '0'
 
 # Example: '0.4.2'