diff --git a/CHANGELOG.md b/CHANGELOG.md
index 05bf84a..0b4eca9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+2021.04.00
+  - Add ParamComplex.
+  - Fix bug in printing header.
+
 2020.09.00
   - CMake improvements to use as sub-project.
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 24b7336..15d720c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,7 +11,7 @@ cmake_minimum_required( VERSION 3.15 )
 
 project(
     testsweeper
-    VERSION 2020.06.00
+    VERSION 2021.04.00
     LANGUAGES CXX
 )
 
diff --git a/testsweeper.hh b/testsweeper.hh
index 6a8478d..0c6381b 100644
--- a/testsweeper.hh
+++ b/testsweeper.hh
@@ -17,8 +17,8 @@
 #include <complex>
 
 // Version is updated by make_release.py; DO NOT EDIT.
-// Version 2020.09.00
-#define TESTSWEEPER_VERSION 20200900
+// Version 2021.04.00
+#define TESTSWEEPER_VERSION 20210400
 
 namespace testsweeper {