diff --git a/CHANGELOG.md b/CHANGELOG.md
index e2df9f02..2c59df41 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,7 +16,48 @@ will consitute of a breaking change warranting a new major release:
 
 # [unreleased]
 
-# [v4.0.0] to be released
+# [v4.0.1] 2023-06-23
+
+## Fixed
+
+- `PusLiveDemux` packet demultiplexing bugfix where the demultiplexing did not work when there was
+  only one destination available.
+
+# [v4.0.0] 2023-06-22
+
+- `eive-tmtc` version v5.0.0
+- `q7s-package` version v3.1.1
+
+## Fixed
+
+- Important bugfixes for PTME. See `q7s-package` CHANGELOG.
+- TCS fixes: Set temperature values to invalid value for MAX31865 RTD handler, SUS handler
+  and STR handler. Also set dataset to invakid for RTD handler.
+- Fixed H parameter in SUS converter from 1 mm to 2.5 mm.
+
+## Changed
+
+- Removed PTME busy/ready signals. Those were not used anyway because register reads are used now.
+- APB bus access busy checking is not done anymore as this is performed by the bus itself now.
+- Core controller will now announce version and image information event in addition to reboot
+  event in the `inititalize` function.
+- Core controller will now try to request and announce the firmware version in addition to the
+  OBSW version as well.
+- Added core controller action to read reboot mechansm information
+- GNSS reset pin will now only be asserted for 5 ms instead of 100 ms.
+
+## Added
+
+- Added PL I2C reset pin. It is not used/connected for now but could be used for FDIR procedures to
+  restore the PL I2C.
+- Core controller now announces firmware version as well when requesting a version info event
+
+# [v3.3.1] 2023-06-22
+
+## Fixed
+
+- `PusLiveDemux` packet demultiplexing bugfix where the demultiplexing did not work when there was
+  only one destination available.
 
 # [v3.3.0] 2023-06-21