diff --git a/ConfigSpace/__version__.py b/ConfigSpace/__version__.py
index 4a03b641..433ba650 100644
--- a/ConfigSpace/__version__.py
+++ b/ConfigSpace/__version__.py
@@ -1,4 +1,4 @@
 """Version information."""
 
 # The following line *must* be the last in the module, exactly as formatted:
-__version__ = "0.4.19"
+__version__ = "0.4.20"
diff --git a/changelog.md b/changelog.md
index beb65e53..599bba45 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,9 @@
+# Version 0.4.20
+
+* MAINT #185: Drop support for Python 3.6
+* FIX #190: Remove old files with old GPL-3.0 license
+* ADD #191: Configuration and ConfigurationSpace can now act as mappings
+
 # Version 0.4.19
 
 * ADD #184: Wheels.