diff --git a/karma.conf.cjs b/karma.conf.cjs
index 9510986..bbbba45 100644
--- a/karma.conf.cjs
+++ b/karma.conf.cjs
@@ -23,6 +23,7 @@ module.exports = function (config) {
       resolve: webpackConfig.resolve,
       experiments: webpackConfig.experiments,
       optimization: webpackConfig.optimization,
+      externals: webpackConfig.externals,
       stats: {warnings:false},
     },
     reporters: ["spec"],
diff --git a/webpack.config.cjs b/webpack.config.cjs
index 7c0991d..360cd5b 100644
--- a/webpack.config.cjs
+++ b/webpack.config.cjs
@@ -29,6 +29,9 @@ module.exports = {
       child_process: false,
     },
   },
+  externals: {
+    "@chainsafe/blst": {}
+  },
   experiments: {
     topLevelAwait: true,
   },