diff --git a/package.json b/package.json
index 4878d58d5775..a03f688a59e8 100644
--- a/package.json
+++ b/package.json
@@ -124,7 +124,7 @@
     "jsdom": "16.2.2",
     "json-stable-stringify": "1.0.1",
     "json5": "2.1.3",
-    "karma": "5.0.4",
+    "karma": "5.0.5",
     "karma-browserify": "7.0.0",
     "karma-chai": "0.1.0",
     "karma-chrome-launcher": "3.1.0",
diff --git a/third_party/amp-toolbox-cache-url/package.json b/third_party/amp-toolbox-cache-url/package.json
index bd7d9e61e9e3..ae46bcf04f05 100644
--- a/third_party/amp-toolbox-cache-url/package.json
+++ b/third_party/amp-toolbox-cache-url/package.json
@@ -36,7 +36,7 @@
     "eslint": "6.8.0",
     "eslint-config-google": "0.14.0",
     "jasmine": "3.5.0",
-    "karma": "5.0.4",
+    "karma": "5.0.5",
     "karma-chrome-launcher": "3.1.0",
     "karma-jasmine": "3.1.1",
     "npm-run-all": "4.1.5",
diff --git a/yarn.lock b/yarn.lock
index 226c05b6daae..50c7e05eab3d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -10274,10 +10274,10 @@ karma-super-dots-reporter@0.2.0:
     chalk "^0.5.1"
     log-symbols "^1.0.1"
 
-karma@5.0.4:
-  version "5.0.4"
-  resolved "https://registry.yarnpkg.com/karma/-/karma-5.0.4.tgz#b374a1e541ad66da668460b99c6faf20cfffc97a"
-  integrity sha512-UGqTe2LBiGQBXRN+Fygeiq63tbfOX45639SKSbPkLpARwnxROWJZg+froGkpHxr84FXCe8UGCf+1PITM6frT5w==
+karma@5.0.5:
+  version "5.0.5"
+  resolved "https://registry.yarnpkg.com/karma/-/karma-5.0.5.tgz#f7716f459f354734a7856ef9ed67fe0a38270aa4"
+  integrity sha512-Q4Su7kNwkTgqS+KbSCYgH0p4a/0JIxVLyp7qKNV7vgPNhIF4kIoh0GlUfMKpw67BrR3hgPQSJoxgF7xnzUtPpg==
   dependencies:
     body-parser "^1.16.1"
     braces "^3.0.2"