diff --git a/.github/workflows/build-test.yml b/.github/workflows/build-test.yml
index dca3e8f618..209d403983 100644
--- a/.github/workflows/build-test.yml
+++ b/.github/workflows/build-test.yml
@@ -36,7 +36,9 @@ jobs:
       - name: Install maven
         run: wget https://archive.apache.org/dist/maven/maven-3/3.8.6/binaries/apache-maven-3.8.6-bin.zip && unzip -qq apache-maven-3.8.6-bin.zip
       - name: Set environment variables
-        run: export M2_HOME=$PWD/apache-maven-3.8.6 && export PATH=$M2_HOME/bin:$PATH && echo "MAVEN_OPTS='-Xmx1g -DENABLE_JACOCO=false'" > ~/.mavenrc
+        run: export M2_HOME=$PWD/apache-maven-3.8.6 && export PATH=$M2_HOME/bin:$PATH && echo "MAVEN_OPTS='-Xmx1g -DENABLE_JACOCO=true'" > ~/.mavenrc
       - name: Test with Maven
         run: mvn test -Dantlr.testinprocess=true -DJDK_SOURCE_ROOT=../runtime/Java/src -Dperformance.package=
         timeout-minutes: 60
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v3
diff --git a/README.md b/README.md
index 10b0047bdf..d0d86c5ca8 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@
 
 [![Java 8+](https://img.shields.io/badge/java-8+-4c7e9f.svg)](http://java.oracle.com) [![License](https://img.shields.io/badge/license-BSD-blue.svg)](https://raw.githubusercontent.com/tunnelvisionlabs/antlr4/master/LICENSE.txt)
 [![GithubActions](https://github.com/daniellansun/antlr4/actions/workflows/build-test.yml/badge.svg?branch=opt)](https://github.com/daniellansun/antlr4/actions?query=branch%3Aopt++)
+[![codecov](https://codecov.io/gh/daniellansun/antlr4/branch/opt/graph/badge.svg)](https://codecov.io/gh/daniellansun/antlr4)
 
 **ANTLR** (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files. It's widely used to build languages, tools, and frameworks. From a grammar, ANTLR generates a parser that can build parse trees and also generates a listener interface (or visitor) that makes it easy to respond to the recognition of phrases of interest.
 
diff --git a/.codecov.yml b/codecov.yml
similarity index 69%
rename from .codecov.yml
rename to codecov.yml
index 939525ac35..ff13581b31 100644
--- a/.codecov.yml
+++ b/codecov.yml
@@ -4,9 +4,11 @@
 coverage:
   status:
     project:
-      default: false
+      default:
+        informational: true
     patch:
-      default: false
+      default:
+        informational: true
 
 comment:
   layout: "diff, flags, files, footer"