diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2c329b7..ea3a8bc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -75,11 +75,11 @@ jobs:
 
         - name: Node.js 8.x
           node-version: "8.17"
-          npm-i: mocha@7.2.0
+          npm-i: mocha@7.2.0 nyc@14.1.1
 
         - name: Node.js 9.x
           node-version: "9.11"
-          npm-i: mocha@7.2.0
+          npm-i: mocha@7.2.0 nyc@14.1.1
 
         - name: Node.js 10.x
           node-version: "10.24"