diff --git a/package.json b/package.json
index 4f97dfa0..5d1eb0dc 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
   },
   "devDependencies": {
     "@bazel/hide-bazel-files": "~0.38.2",
-    "@bazel/karma": "~0.33.1",
+    "@bazel/karma": "~0.39.0",
     "@bazel/typescript": "~0.33.1",
     "@improbable-eng/grpc-web": "^0.9.1",
     "@types/chai": "^4.2.3",
diff --git a/yarn.lock b/yarn.lock
index d1019cb9..6881ba83 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -23,13 +23,13 @@
   resolved "https://registry.yarnpkg.com/@bazel/hide-bazel-files/-/hide-bazel-files-0.38.3.tgz#e98231d3d360d51860d9c1a7c3345b40dab4cf81"
   integrity sha512-o+dNkfDm3qxWQ8h/04cWuTcjR7qnjZi3pQGv4aklVb16oPWx2jF8BzbkwvWuIkdbOl9VnqYP0vaHzwQVJRRcIA==
 
-"@bazel/karma@~0.33.1":
-  version "0.33.1"
-  resolved "https://registry.yarnpkg.com/@bazel/karma/-/karma-0.33.1.tgz#cb858faaa01f92c868610690ba680d3a32ec2958"
-  integrity sha512-9LI3FYrEmgMuIK1a6YF3o6BrQ9IvrRCS5kfAVP7NgEqnCQkZf3qOkzXTq8rE3unBdBTHlFOUEVvBM5w+j7o4Fg==
+"@bazel/karma@~0.39.0":
+  version "0.39.0"
+  resolved "https://registry.yarnpkg.com/@bazel/karma/-/karma-0.39.0.tgz#1e37cf8364f0be0967b9d93f32659ebcb2015e6d"
+  integrity sha512-tbVl4hZhKm4z99GolgvkZNzcK3Th5XpfCIoC2Ygn+WLD+Z5cKEyFp5F/ga2MY1QVPtChY6EKFWkFvxTIxwehFg==
   dependencies:
     jasmine-core "2.8.0"
-    karma "^4.0.0"
+    karma "~4.1.0"
     karma-chrome-launcher "2.2.0"
     karma-firefox-launcher "1.1.0"
     karma-jasmine "2.0.1"
@@ -1355,9 +1355,10 @@ karma-sourcemap-loader@0.3.7:
   dependencies:
     graceful-fs "^4.1.2"
 
-karma@^4.0.0:
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/karma/-/karma-4.0.1.tgz#2581d6caa0d4cd28b65131561b47bad6d5478773"
+karma@~4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/karma/-/karma-4.1.0.tgz#d07387c9743a575b40faf73e8a3eb5421c2193e1"
+  integrity sha512-xckiDqyNi512U4dXGOOSyLKPwek6X/vUizSy2f3geYevbLj+UIdvNwbn7IwfUIL2g1GXEPWt/87qFD1fBbl/Uw==
   dependencies:
     bluebird "^3.3.0"
     body-parser "^1.16.1"