diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b03597148f..dd3cc02e31 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -107,6 +107,27 @@ jobs:
       uses: codecov/codecov-action@81cd2dc8148241f03f5839d295e000b8f761e378 # v3.1.0
       with:
         files: lcov.info
+  # Check if the bundle size was committed and is up-to-date
+  bundle-size:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checking out
+      uses: actions/checkout@v2
+    - name: Install Rust toolchain
+      uses: ./.github/actions/rust-cargo-run
+      with:
+        command: version
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+    - name: Update bundle size
+      run: |
+        git config --local user.email "github-actions[bot]@users.noreply.github.com"
+        git config --local user.name "github-actions[bot]"
+        make bundle-size
+        git commit -a -m "update bundle-size"
+    - name: Push changes
+      uses: ad-m/github-push-action@master
+      with:
+        branch: ${{ github.head_ref }}
   # Lint shell scripts
   shellcheck:
     runs-on: ubuntu-latest
diff --git a/Makefile b/Makefile
index db5a24dee7..5db4a94b42 100644
--- a/Makefile
+++ b/Makefile
@@ -42,7 +42,11 @@ publish:
 
 # Create a bundle in a deterministic location
 bundle: deps-build
-	cargo run -- -o output/builtin-actors.car
+	cargo run --locked -- -o output/builtin-actors.car
+
+# Update the bundle size file
+bundle-size: bundle
+	@bash scripts/update-bundle-size.sh $@ output/builtin-actors.car
 
 # Create all canonical network bundles
 all-bundles: bundle-mainnet bundle-caterpillarnet bundle-butterflynet bundle-calibrationnet bundle-devnet bundle-testing bundle-testing
@@ -66,7 +70,8 @@ bundle-testing: deps-build
 	BUILD_FIL_NETWORK=testing cargo run -- -o output/builtin-actors-testing.car
 	BUILD_FIL_NETWORK=testing-fake-proofs cargo run -- -o output/builtin-actors-testing-fake-proofs.car
 
-.PHONY: all-bundles bundle-mainnet bundle-caterpillarnet bundle-butterflynet bundle-calibrationnet bundle-devnet bundle-testing
+
+.PHONY: all-bundles bundle-mainnet bundle-caterpillarnet bundle-butterflynet bundle-calibrationnet bundle-devnet bundle-testing bundle-size
 
 # Check if the working tree is clean.
 check-clean:
diff --git a/bundle-size b/bundle-size
new file mode 100644
index 0000000000..3d6b9e019e
--- /dev/null
+++ b/bundle-size
@@ -0,0 +1 @@
+6033975
diff --git a/scripts/update-bundle-size.sh b/scripts/update-bundle-size.sh
new file mode 100644
index 0000000000..1adb52cc1d
--- /dev/null
+++ b/scripts/update-bundle-size.sh
@@ -0,0 +1,34 @@
+#!/bin/bash
+# Checks and updates bundle size file, printing delta between the previous and current bundle size.
+
+# Check if the user provided both arguments
+if [ $# -ne 2 ]; then
+  echo "Usage: ./update-bundle-size.sh <bundle-size-path> <bundle-path>"
+  exit 1
+fi
+
+# Check if paths exist
+if [[ ! -f $1 || ! -f $2 ]]; then
+  echo "Invalid arguments. Please check that the files exist."
+  exit 1
+fi
+
+bundle_size_path=$1
+bundle_path=$2
+
+# Grab the current bundle size
+size_old=$(head -n 1 "$bundle_size_path")
+
+# Update bundle size
+wc -c < "$bundle_path" > "$bundle_size_path"
+
+# Grab the new bundle size
+size_new=$(head -n 1 "$bundle_size_path")
+
+# Calculate the difference
+diff=$((size_new - size_old))
+
+# Print stats
+echo "Old bundle size: $size_old"
+echo "New bundle size: $size_new"
+echo "Delta:           $diff bytes"