diff --git a/.github/workflows/cargo-publish.yml b/.github/workflows/cargo-publish.yml
new file mode 100644
index 0000000000..5b7e9f8956
--- /dev/null
+++ b/.github/workflows/cargo-publish.yml
@@ -0,0 +1,23 @@
+name: Publish to crates.io
+
+on:
+  # Triggered when we tag a release (including a prerelease)
+  release:
+    types: [published]
+
+jobs:
+  cargo-publish:
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install latest nightly
+        uses: actions-rs/toolchain@v1
+        with:
+          components: rustfmt, clippy
+          target: i686-unknown-linux-gnu
+          # This overwrites the default toolchain with the toolchain specified above.
+          override: true
+      - name: Cargo login
+        run: cargo login ${{ secrets.CI_CARGO_LOGIN }}
+      - name: Cargo publish
+        run: cargo publish
diff --git a/CHANGELOG.md b/CHANGELOG.md
index bf18367013..c3d0e70afb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+0.4.1 (2021-05-20)
+===
+
+Misc
+---
+* Upgrade the Rust version we use to nightly-2021-05-12 (1.54.0-nightly).
+
 0.4.0 (2021-05-14)
 ===
 
diff --git a/Cargo.toml b/Cargo.toml
index ef8792aed1..785bd78997 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mmtk"
-version = "0.4.0"
+version = "0.4.1"
 authors = ["The MMTk Developers <>"]
 edition = "2018"
 license = "MIT OR Apache-2.0"