diff --git a/Cargo.lock b/Cargo.lock
index bf920a87..5869197b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2116,7 +2116,7 @@ dependencies = [
 
 [[package]]
 name = "qcs"
-version = "0.21.3-rc.0"
+version = "0.21.3"
 dependencies = [
  "assert2",
  "async-trait",
@@ -2251,7 +2251,7 @@ dependencies = [
 
 [[package]]
 name = "qcs-sdk-python"
-version = "0.17.3-rc.0"
+version = "0.17.3"
 dependencies = [
  "async-trait",
  "numpy",
diff --git a/crates/lib/CHANGELOG.md b/crates/lib/CHANGELOG.md
index d06e477a..c2cb508d 100644
--- a/crates/lib/CHANGELOG.md
+++ b/crates/lib/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 0.21.3
+
+### Fixes
+
+- Update quil-rs, fixing a regression in DELAY parsing (#450)
+
 ## 0.21.3-rc.0
 
 ### Fixes
diff --git a/crates/lib/Cargo.toml b/crates/lib/Cargo.toml
index 5fbd868d..6ee74439 100644
--- a/crates/lib/Cargo.toml
+++ b/crates/lib/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "qcs"
 description = "High level interface for running Quil on a QPU"
-version = "0.21.3-rc.0"
+version = "0.21.3"
 edition = "2018"
 license = "Apache-2.0"
 repository = "https://github.com/rigetti/qcs-sdk-rust"
diff --git a/crates/python/CHANGELOG.md b/crates/python/CHANGELOG.md
index 901eaa0a..48f93ac8 100644
--- a/crates/python/CHANGELOG.md
+++ b/crates/python/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 0.17.3
+
+### Fixes
+
+- Update quil-rs, fixing a regression in DELAY parsing (#450)
+
 ## 0.17.3-rc.0
 
 ### Fixes
diff --git a/crates/python/Cargo.toml b/crates/python/Cargo.toml
index 4ab42ec3..5a8fc452 100644
--- a/crates/python/Cargo.toml
+++ b/crates/python/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "qcs-sdk-python"
 description = "Python bindings to qcs-sdk-rust"
-version = "0.17.3-rc.0"
+version = "0.17.3"
 edition = "2021"
 license = "Apache-2.0"
 repository = "https://github.com/rigetti/qcs-sdk-rust"
diff --git a/crates/python/pyproject.toml b/crates/python/pyproject.toml
index 88ebf03f..1728fa25 100644
--- a/crates/python/pyproject.toml
+++ b/crates/python/pyproject.toml
@@ -1,7 +1,7 @@
 # This is the metadata Maturin uploads to PyPI on publish
 [project]
 name = "qcs-sdk-python"
-version = "0.17.3-rc.0"
+version = "0.17.3"
 description = "Python interface for the QCS Rust SDK"
 readme = "README.md"
 license = { text = "Apache-2.0" }
@@ -26,7 +26,7 @@ dependencies = ["quil==0.7.0"]
 # We can remove this table once this issue is resolved: https://github.com/python-poetry/poetry/issues/3332
 [tool.poetry]
 name = "qcs-sdk-python"
-version = "0.17.3-rc.0"
+version = "0.17.3"
 description = "Python interface for the QCS Rust SDK"
 readme = "README.md"
 authors = [