diff --git a/README.rst b/README.rst
index 15f6a127..aad2b657 100644
--- a/README.rst
+++ b/README.rst
@@ -51,6 +51,12 @@ While bcrypt remains an acceptable choice for password storage, depending on you
 Changelog
 =========
 
+4.2.0
+-----
+
+* Bump Rust dependency versions
+* Removed the ``BCRYPT_ALLOW_RUST_163`` environment variable.
+
 4.1.3
 -----
 
diff --git a/pyproject.toml b/pyproject.toml
index 9fc9980d..4cdce8fd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,7 @@ build-backend = "setuptools.build_meta"
 [project]
 name = "bcrypt"
 # When updating this, also update lib.rs
-version = "4.1.3"
+version = "4.2.0"
 authors = [
     {name = "The Python Cryptographic Authority developers", email = "cryptography-dev@python.org"}
 ]
diff --git a/src/_bcrypt/src/lib.rs b/src/_bcrypt/src/lib.rs
index dc62d7d1..f36a17a7 100644
--- a/src/_bcrypt/src/lib.rs
+++ b/src/_bcrypt/src/lib.rs
@@ -196,7 +196,7 @@ mod _bcrypt {
         // When updating this, also update pyproject.toml
         // This isn't named __version__ because passlib treats the existence of
         // that attribute as proof that we're a different module
-        m.add("__version_ex__", "4.1.3")?;
+        m.add("__version_ex__", "4.2.0")?;
 
         let author = "The Python Cryptographic Authority developers";
         m.add("__author__", author)?;