diff --git a/package-lock.json b/package-lock.json
index fc30da9..431d189 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1600,6 +1600,12 @@
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+      "resolved": "https://registry.npmjs.org/abab/-/abab-2.0.6.tgz",
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       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
@@ -6142,9 +6148,9 @@
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+      "resolved": "https://registry.npmjs.org/loader-utils/-/loader-utils-1.4.2.tgz",
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-      "resolved": "https://registry.npmjs.org/source-map-loader/-/source-map-loader-0.1.6.tgz",
-      "integrity": "sha1-wJkD2m1zueU7ftjuUkVZcFHpjpE=",
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-        "loader-utils": "~0.2.2",
-        "source-map": "~0.1.33"
+        "abab": "^2.0.6",
+        "iconv-lite": "^0.6.3",
+        "source-map-js": "^1.0.2"
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-          "resolved": "https://registry.npmjs.org/async/-/async-0.9.2.tgz",
-          "integrity": "sha1-rqdNXmHB+JlhO/ZL2mbUx48v0X0=",
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-          "resolved": "https://registry.npmjs.org/emojis-list/-/emojis-list-2.1.0.tgz",
-          "integrity": "sha1-TapNnbAPmBmIDHn6RXrlsJof04k=",
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-          "integrity": "sha1-wkvBRspRfBRx9drL4lcbK3+eM0Y=",
+        "iconv-lite": {
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+          "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
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           "dev": true,
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-            "amdefine": ">=0.0.4"
+            "safer-buffer": ">= 2.1.2 < 3.0.0"
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diff --git a/package.json b/package.json
index 818a6e1..5f681b1 100644
--- a/package.json
+++ b/package.json
@@ -90,7 +90,7 @@
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     "ohdsi-ui-toolbox": "^1.0.0",
     "sass-loader": "^7.2.0",
-    "source-map-loader": "0.1.6",
+    "source-map-loader": "4.0.1",
     "style-loader": "1.1.3",
     "ts-loader": "4.5.0",
     "typescript": "2.3.4",