diff --git a/package.json b/package.json
index bc58a16..200ae77 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "test": "ts-mocha --project ./tsconfig.json test/commands/**/*.ts",
     "test:integration": "NODE_ENV=harness ts-mocha --async-stack-traces --require test/integration/fixtures.ts --project ./tsconfig.json \"test/integration/**/*Test.ts\"",
     "test:manual": "NODE_ENV=harness ts-node test/integration/manualLaunchScript.ts",
-    "version": "sed -i 's/[0-9]\\.[0-9]\\.[0-9]/'$npm_package_version'/g' synapse_antispam/setup.py && git add synapse_antispam/setup.py && cat synapse_antispam/setup.py"
+    "version": "sed -i '/# version automated/s/[0-9][0-9]*\\.[0-9][0-9]*\\.[0-9][0-9]*/'$npm_package_version'/' synapse_antispam/setup.py && git add synapse_antispam/setup.py && cat synapse_antispam/setup.py"
   },
   "devDependencies": {
     "@types/config": "0.0.41",
diff --git a/synapse_antispam/setup.py b/synapse_antispam/setup.py
index ad0b4f1..93029b3 100644
--- a/synapse_antispam/setup.py
+++ b/synapse_antispam/setup.py
@@ -2,7 +2,7 @@ from setuptools import setup, find_packages
 
 setup(
     name="mjolnir",
-    version="0.1.0",
+    version="0.1.0", # version automated in package.json - Do not edit this line, use `yarn version`.
     packages=find_packages(),
     description="Mjolnir Antispam",
     include_package_data=True,