diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7edf5ea..f9e9cbb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 0.4.0-rc.0
+
+### Breaking Changes
+
+- fully move all dependencies on pyo3 time types under our time feature + expose new abi3 feature for documentation
+
 ## 0.3.6
 
 ### Features
diff --git a/Cargo.toml b/Cargo.toml
index 0bc1fe9..e28a7e8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rigetti-pyo3"
-version = "0.3.6"
+version = "0.4.0-rc.0"
 edition = "2021"
 license = "Apache-2.0"
 repository = "https://github.com/rigetti/rigetti-pyo3"