diff --git a/.codecov.yml b/.codecov.yml
new file mode 100644
index 0000000..5c224fc
--- /dev/null
+++ b/.codecov.yml
@@ -0,0 +1,25 @@
+codecov:
+  require_ci_to_pass: true
+
+coverage:
+  precision: 2 # how many decimal places to display in the UI: 0 <= value <= 4
+  round: nearest # how coverage is rounded: down/up/nearest
+  range: 50...75 # custom range of coverage colors from red -> yellow -> green
+  status:
+    # pull-requests only
+    patch:
+      default:
+        threshold: 3.0% # coverage can drop up top 3% without giving failure
+    project:
+      default:
+        threshold: 3.0% # coverage can drop up top 3% without giving failure
+
+# comment: false  # to disable comments
+comment:
+  layout: 'header, diff, changes, sunburst, suggestions, tree'
+  behavior:
+    default
+    # option: "default" posts once then update, posts new if delete
+    # option: "once"    post once then updates, if deleted do not post new
+    # option: "new"     delete old, post new
+    # option: "spammy"  post new
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 7e2bb8f..f663d78 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -28,8 +28,8 @@ jobs:
       - name: Test and generate coverage report
         run: npm run test:coverage
 
-      # TODO: upload coverage report to codecov
-      # - name: Upload coverage report to Codecov
-      #   uses: codecov/codecov-action@v3
-      #   with:
-      #     token: ${{ secrets.CODECOV_TOKEN }}
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v4.0.1
+        env:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          slug: m-tartari/m-tartari.github.io