diff --git a/package-lock.json b/package-lock.json
index 094970869..6a66545a4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4070,9 +4070,9 @@
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@@ -6764,7 +6764,7 @@
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@@ -6792,11 +6792,6 @@
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@@ -6847,6 +6842,11 @@
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+            "resolved": "https://registry.npmjs.org/js-base64/-/js-base64-2.6.4.tgz",
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@@ -9819,9 +9819,9 @@
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-            "integrity": "sha512-H7ErYLM34CvDMto3GbD6xD0JLUGYXR3QTcH6B/tr4Hi/QpSThnCsIp+Sy5FRTw3B0d6py4HcNkW7nO/wdtGWEw=="
+            "version": "3.7.7",
+            "resolved": "https://registry.npmjs.org/js-base64/-/js-base64-3.7.7.tgz",
+            "integrity": "sha512-7rCnleh0z2CkXhH67J8K1Ytz0b2Y+yxTPL+/KOJoa20hfnVQ/3/T6W/KflYI4bRHRagNeXeU2bkNGI3v1oS/lw=="
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@@ -10724,7 +10724,7 @@
                 "collection-utils": "^1.0.1",
                 "cross-fetch": "^4.0.0",
                 "is-url": "^1.2.4",
-                "js-base64": "^3.7.5",
+                "js-base64": "^3.7.7",
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                 "pluralize": "^8.0.0",
@@ -10742,11 +10742,6 @@
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-                "js-base64": {
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-                    "resolved": "https://registry.npmjs.org/js-base64/-/js-base64-3.7.5.tgz",
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@@ -10790,6 +10785,11 @@
                         "whatwg-fetch": ">=0.10.0"
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+                "js-base64": {
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+                    "resolved": "https://registry.npmjs.org/js-base64/-/js-base64-2.6.4.tgz",
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                     "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-1.7.3.tgz",
diff --git a/packages/quicktype-core/package.json b/packages/quicktype-core/package.json
index e5d1e17a8..0e6df778c 100644
--- a/packages/quicktype-core/package.json
+++ b/packages/quicktype-core/package.json
@@ -18,7 +18,7 @@
         "collection-utils": "^1.0.1",
         "is-url": "^1.2.4",
         "cross-fetch": "^4.0.0",
-        "js-base64": "^3.7.5",
+        "js-base64": "^3.7.7",
         "lodash": "^4.17.21",
         "pako": "^1.0.6",
         "pluralize": "^8.0.0",