diff --git a/CHANGES.md b/CHANGES.md
index b4ecf62..c6869fe 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,9 @@
 # Release Notes
 
+## 0.3.4
+
+Upgrade the science internal Python distribution to [PBS][PBS] CPython 3.12.3.
+
 ## 0.3.3
 
 Fix `science doc open` to use a local documentation server. This works around all the problems
diff --git a/lift.toml b/lift.toml
index 1f8fc0f..2306b76 100644
--- a/lift.toml
+++ b/lift.toml
@@ -7,8 +7,8 @@ description = "Ship your interpreted executables using science."
 [[lift.interpreters]]
 id = "cpython"
 provider = "PythonBuildStandalone"
-release = "20240224"
-version = "3.12.2"
+release = "20240415"
+version = "3.12.3"
 # By default science ships as a "thin" scie that fetches CPython 3.12 on first run.
 # We use `science lift --invert-lazy cpython ...` when producing "fat" scies.
 lazy = true
diff --git a/science/__init__.py b/science/__init__.py
index a66e7b6..69db694 100644
--- a/science/__init__.py
+++ b/science/__init__.py
@@ -3,6 +3,6 @@
 
 from packaging.version import Version
 
-__version__ = "0.3.3"
+__version__ = "0.3.4"
 
 VERSION = Version(__version__)