diff --git a/.github/workflows/packages.yml b/.github/workflows/packages.yml
index 33c02a3..ea99f8c 100644
--- a/.github/workflows/packages.yml
+++ b/.github/workflows/packages.yml
@@ -840,3 +840,37 @@ jobs:
       - name: Test
         working-directory: blake3
         run: go test ./...
+  mmcloughlin-md4:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@37335c7bb261b353407cff977110895fa0b4f7d8 # v2.1.3
+        with:
+          go-version: 1.18.x
+      - name: Checkout avo
+        uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f # v2.3.4
+        with:
+          path: avo
+          persist-credentials: false
+      - name: Checkout mmcloughlin/md4
+        uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f # v2.3.4
+        with:
+          repository: mmcloughlin/md4
+          ref: v0.1.2
+          path: md4
+          persist-credentials: false
+      - name: Avo Module Replacement
+        working-directory: md4/asm
+        run: |
+          go mod edit -modfile=go.mod -require=github.com/mmcloughlin/avo@v0.0.0-00010101000000-000000000000
+          go mod edit -modfile=go.mod -replace=github.com/mmcloughlin/avo=${{ github.workspace }}/avo
+          go mod tidy -modfile=go.mod
+      - name: Generate
+        working-directory: md4
+        run: go generate -v -x
+      - name: Diff
+        working-directory: md4
+        run: git diff
+      - name: Test
+        working-directory: md4
+        run: go test ./...
diff --git a/tests/thirdparty/packages.json b/tests/thirdparty/packages.json
index e48948e..6025585 100644
--- a/tests/thirdparty/packages.json
+++ b/tests/thirdparty/packages.json
@@ -201,7 +201,7 @@
         },
         "metadata": {
             "description": "Optimized Go Compression Packages",
-            "stars": 2701
+            "stars": 2702
         },
         "default_branch": "master",
         "version": "2adf487b3e02f95ce7efd6e4953fda0ae7ecd080",
@@ -623,5 +623,25 @@
                 ]
             }
         ]
+    },
+    {
+        "repository": {
+            "owner": "mmcloughlin",
+            "name": "md4"
+        },
+        "metadata": {
+            "description": "Assembly-optimized MD4 hash algorithm in Go",
+            "stars": 15
+        },
+        "default_branch": "main",
+        "version": "v0.1.2",
+        "module": "asm/go.mod",
+        "generate": [
+            {
+                "commands": [
+                    "go generate -v -x"
+                ]
+            }
+        ]
     }
 ]