diff --git a/packages/gatsby-theme-iterative/package.json b/packages/gatsby-theme-iterative/package.json
index ced7f4fe..b9106ba0 100644
--- a/packages/gatsby-theme-iterative/package.json
+++ b/packages/gatsby-theme-iterative/package.json
@@ -71,7 +71,7 @@
   "devDependencies": {
     "@types/gatsbyjs__reach-router": "^2.0.0",
     "@types/hast": "3.0.3",
-    "@types/isomorphic-fetch": "^0.0.36",
+    "@types/isomorphic-fetch": "^0.0.39",
     "@types/promise-polyfill": "^6.0.4",
     "@types/react-collapse": "^5.0.1",
     "@types/react-helmet": "^6.1.6",
diff --git a/yarn.lock b/yarn.lock
index 546a995a..dd7df353 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2526,10 +2526,10 @@
   dependencies:
     "@types/node" "*"
 
-"@types/isomorphic-fetch@^0.0.36":
-  version "0.0.36"
-  resolved "https://registry.yarnpkg.com/@types/isomorphic-fetch/-/isomorphic-fetch-0.0.36.tgz#3a6d8f63974baf26b10fd1314db910633108a769"
-  integrity sha512-ulw4d+vW1HKn4oErSmNN2HYEcHGq0N1C5exlrMM0CRqX1UUpFhGb5lwiom5j9KN3LBJJDLRmYIZz1ghm7FIzZw==
+"@types/isomorphic-fetch@^0.0.39":
+  version "0.0.39"
+  resolved "https://registry.yarnpkg.com/@types/isomorphic-fetch/-/isomorphic-fetch-0.0.39.tgz#889573a72ca637bc1a665910a41ff1cb3b52011f"
+  integrity sha512-I0gou/ZdA1vMG7t7gMzL7VYu2xAKU78rW9U1l10MI0nn77pEHq3tQqHQ8hMmXdMpBlkxZOorjI4sO594Z3kKJw==
 
 "@types/js-cookie@^2.2.6":
   version "2.2.7"