diff --git a/CHANGELOG.md b/CHANGELOG.md
index d8051975b..2a1d76c1f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,9 +4,22 @@
 
 ### Breaking Changes
 
+### Features
+
+### Bug Fixes
+
+### Other
+
+### Migrating
+
+## v4.0.0
+
+### Breaking Changes
+
 * driver: added support for the 0 .. 2.5V ADC range to MAX11300 getter functions `const`, splitting the `enum VoltageRange` into two enums for the ADC and DAC configurations.
 
 ### Features
+
 * driver: added support for the MCP23x17 I/O Expander with I2C transport implementation
 
 ### Bug Fixes
diff --git a/src/version.h b/src/version.h
index e3d57a720..63a9bc81c 100644
--- a/src/version.h
+++ b/src/version.h
@@ -2,7 +2,7 @@
 #ifndef DSY_VERSION_H
 #define DSY_VERSION_H
 
-#define LIBDAISY_VER_MAJ 1
+#define LIBDAISY_VER_MAJ 4
 #define LIBDAISY_VER_MIN 0
 #define LIBDAISY_VER_PATCH 0