diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 19ee807a..4a403c7d 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.19.0"
+  ".": "0.19.1"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8b8be69f..e4357f82 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## [0.19.1](https://github.com/denehoffman/laddu/compare/v0.19.0...v0.19.1) (2026-05-18)
+
+
+### Features
+
+* Add selection rules and more complex quantum state handling, plus a few minor renames and API changes ([6922866](https://github.com/denehoffman/laddu/commit/6922866998d1fa0c8114efc3abb862b155a77baa))
+* Simplify helicity surface, add python API for quantum numbers ([01a95c2](https://github.com/denehoffman/laddu/commit/01a95c29d4e518c46894435e0b5a65e8c8fff274))
+
+
+### Bug Fixes
+
+* Correct parameter behavior in complex likelihood expressions ([6bdab33](https://github.com/denehoffman/laddu/commit/6bdab333ed7412ce152d4474647feaafcd33a4cd))
+
 ## [0.19.0](https://github.com/denehoffman/laddu/compare/v0.18.0...v0.19.0) (2026-05-07)
 
 
diff --git a/Cargo.toml b/Cargo.toml
index 6f0e162d..c39e7b13 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -49,12 +49,12 @@ sysinfo = "0.38.4"
 thiserror = "2.0.18"
 typetag = "0.2.21"
 
-laddu = { version = "0.19.0", path = "crates/laddu" }
-laddu-core = { version = "0.19.0", path = "crates/laddu-core" }
-laddu-amplitudes = { version = "0.19.0", path = "crates/laddu-amplitudes" }
-laddu-extensions = { version = "0.19.0", path = "crates/laddu-extensions" }
-laddu-generation = { version = "0.19.0", path = "crates/laddu-generation" }
-laddu-python = { version = "0.19.0", path = "crates/laddu-python" }
+laddu = { version = "0.19.1", path = "crates/laddu" }
+laddu-core = { version = "0.19.1", path = "crates/laddu-core" }
+laddu-amplitudes = { version = "0.19.1", path = "crates/laddu-amplitudes" }
+laddu-extensions = { version = "0.19.1", path = "crates/laddu-extensions" }
+laddu-generation = { version = "0.19.1", path = "crates/laddu-generation" }
+laddu-python = { version = "0.19.1", path = "crates/laddu-python" }
 
 [profile.release]
 lto = "fat"
diff --git a/crates/laddu-amplitudes/Cargo.toml b/crates/laddu-amplitudes/Cargo.toml
index 43fe8892..7d1b122c 100644
--- a/crates/laddu-amplitudes/Cargo.toml
+++ b/crates/laddu-amplitudes/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "laddu-amplitudes"
-version = "0.19.0"
+version = "0.19.1"
 authors.workspace = true
 edition.workspace = true
 homepage.workspace = true
diff --git a/crates/laddu-core/Cargo.toml b/crates/laddu-core/Cargo.toml
index 14ed2f9b..3c1dfdf6 100644
--- a/crates/laddu-core/Cargo.toml
+++ b/crates/laddu-core/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "laddu-core"
-version = "0.19.0"
+version = "0.19.1"
 authors.workspace = true
 edition.workspace = true
 homepage.workspace = true
diff --git a/crates/laddu-extensions/Cargo.toml b/crates/laddu-extensions/Cargo.toml
index 345afe03..a9896c33 100644
--- a/crates/laddu-extensions/Cargo.toml
+++ b/crates/laddu-extensions/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "laddu-extensions"
-version = "0.19.0"
+version = "0.19.1"
 authors.workspace = true
 edition.workspace = true
 homepage.workspace = true
diff --git a/crates/laddu-generation/Cargo.toml b/crates/laddu-generation/Cargo.toml
index 03788e46..e83477a7 100644
--- a/crates/laddu-generation/Cargo.toml
+++ b/crates/laddu-generation/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "laddu-generation"
-version = "0.19.0"
+version = "0.19.1"
 description = "Monte Carlo event generation tools for laddu"
 documentation = "https://docs.rs/laddu-generation"
 edition.workspace = true
diff --git a/crates/laddu-python/Cargo.toml b/crates/laddu-python/Cargo.toml
index 2a98d622..8bf926a0 100644
--- a/crates/laddu-python/Cargo.toml
+++ b/crates/laddu-python/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "laddu-python"
-version = "0.19.0"
+version = "0.19.1"
 description = "Amplitude analysis made short and sweet"
 edition.workspace = true
 authors.workspace = true
diff --git a/crates/laddu/Cargo.toml b/crates/laddu/Cargo.toml
index 9cc09624..695c62f9 100644
--- a/crates/laddu/Cargo.toml
+++ b/crates/laddu/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "laddu"
-version = "0.19.0"
+version = "0.19.1"
 description = "Amplitude analysis made short and sweet"
 documentation = "https://docs.rs/laddu"
 edition.workspace = true
diff --git a/py-laddu-cpu/Cargo.toml b/py-laddu-cpu/Cargo.toml
index 59a058a0..31114dd7 100644
--- a/py-laddu-cpu/Cargo.toml
+++ b/py-laddu-cpu/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "py-laddu-cpu"
-version = "0.19.0"
+version = "0.19.1"
 edition.workspace = true
 readme = "README.md"
 license.workspace = true
diff --git a/py-laddu-mpi/Cargo.toml b/py-laddu-mpi/Cargo.toml
index bcb9bf65..3f12dd2d 100644
--- a/py-laddu-mpi/Cargo.toml
+++ b/py-laddu-mpi/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "py-laddu-mpi"
-version = "0.19.0"
+version = "0.19.1"
 edition.workspace = true
 readme = "README.md"
 license.workspace = true
diff --git a/py-laddu/pyproject.toml b/py-laddu/pyproject.toml
index 878ba10b..7ad3ba0b 100644
--- a/py-laddu/pyproject.toml
+++ b/py-laddu/pyproject.toml
@@ -28,12 +28,12 @@ classifiers = [
   "Programming Language :: Python :: 3.13",
   "Programming Language :: Python :: 3.14",
 ]
-version = "0.19.0"
+version = "0.19.1"
 description = "Python bindings for laddu"
 license = "MIT"
 readme = "README.md"
 dependencies = [
-  "laddu-cpu == 0.19.0", # x-release-please-version # WARNING: DO NOT EDIT
+  "laddu-cpu == 0.19.1", # x-release-please-version # WARNING: DO NOT EDIT
   "numpy",
   "ganesh-rs == 0.27.0",
 ]
@@ -47,7 +47,7 @@ pandas = ["pandas"]
 polars = ["polars"]
 tests = ["pytest", "pytest-cov", "pandas", "polars", "uproot", "matplotlib"]
 uproot = ["uproot"]
-mpi = ["laddu-mpi == 0.19.0"] # x-release-please-version #WARNING:  DO NOT EDIT
+mpi = ["laddu-mpi == 0.19.1"] # x-release-please-version #WARNING:  DO NOT EDIT
 
 [tool.maturin]
 bindings = "pyo3"