diff --git a/packages/opencensus-web-core/package.json b/packages/opencensus-web-core/package.json
index 8e797df9..a2a00fd3 100644
--- a/packages/opencensus-web-core/package.json
+++ b/packages/opencensus-web-core/package.json
@@ -56,7 +56,7 @@
     "karma-spec-reporter": "0.0.32",
     "karma-webpack": "^4.0.0-rc.5",
     "rimraf": "^3.0.0",
-    "ts-loader": "^6.0.0",
+    "ts-loader": "^9.0.0",
     "typescript": "^3.1.6",
     "webpack": "^4.18.0",
     "webpack-cli": "^4.0.0",
diff --git a/packages/opencensus-web-exporter-ocagent/package.json b/packages/opencensus-web-exporter-ocagent/package.json
index 49b7518e..21d227cd 100644
--- a/packages/opencensus-web-exporter-ocagent/package.json
+++ b/packages/opencensus-web-exporter-ocagent/package.json
@@ -56,7 +56,7 @@
     "karma-spec-reporter": "0.0.32",
     "karma-webpack": "^4.0.0-rc.5",
     "rimraf": "^3.0.0",
-    "ts-loader": "^6.0.0",
+    "ts-loader": "^9.0.0",
     "typescript": "^3.1.6",
     "webpack": "^4.18.0",
     "webpack-cli": "^4.0.0"
diff --git a/packages/opencensus-web-initial-load/package.json b/packages/opencensus-web-initial-load/package.json
index 4f54f30c..aac8d74b 100644
--- a/packages/opencensus-web-initial-load/package.json
+++ b/packages/opencensus-web-initial-load/package.json
@@ -55,7 +55,7 @@
     "karma-spec-reporter": "0.0.32",
     "karma-webpack": "^4.0.0-rc.5",
     "rimraf": "^3.0.0",
-    "ts-loader": "^6.0.0",
+    "ts-loader": "^9.0.0",
     "typescript": "^3.1.6",
     "webpack": "^4.18.0",
     "webpack-cli": "^4.0.0"
diff --git a/packages/opencensus-web-instrumentation-perf/package.json b/packages/opencensus-web-instrumentation-perf/package.json
index 67254024..e6522513 100644
--- a/packages/opencensus-web-instrumentation-perf/package.json
+++ b/packages/opencensus-web-instrumentation-perf/package.json
@@ -57,7 +57,7 @@
     "karma-spec-reporter": "0.0.32",
     "karma-webpack": "^4.0.0-rc.5",
     "rimraf": "^3.0.0",
-    "ts-loader": "^6.0.0",
+    "ts-loader": "^9.0.0",
     "typescript": "^3.1.6",
     "webpack": "^4.18.0",
     "webpack-cli": "^4.0.0"
diff --git a/packages/opencensus-web-instrumentation-zone-peer-dep/package.json b/packages/opencensus-web-instrumentation-zone-peer-dep/package.json
index 1787e7d4..0b2bfaea 100644
--- a/packages/opencensus-web-instrumentation-zone-peer-dep/package.json
+++ b/packages/opencensus-web-instrumentation-zone-peer-dep/package.json
@@ -56,7 +56,7 @@
     "karma-spec-reporter": "0.0.32",
     "karma-webpack": "^4.0.0-rc.5",
     "rimraf": "^3.0.0",
-    "ts-loader": "^6.0.0",
+    "ts-loader": "^9.0.0",
     "typescript": "^3.1.6",
     "webpack": "^4.32.2",
     "webpack-cli": "^4.0.0",
diff --git a/packages/opencensus-web-instrumentation-zone/package.json b/packages/opencensus-web-instrumentation-zone/package.json
index 9d6942fc..a6f4af7a 100644
--- a/packages/opencensus-web-instrumentation-zone/package.json
+++ b/packages/opencensus-web-instrumentation-zone/package.json
@@ -54,7 +54,7 @@
     "karma-spec-reporter": "0.0.32",
     "karma-webpack": "^4.0.0-rc.5",
     "rimraf": "^3.0.0",
-    "ts-loader": "^6.0.0",
+    "ts-loader": "^9.0.0",
     "typescript": "^3.1.6",
     "webpack": "^4.32.2",
     "webpack-cli": "^4.0.0",
diff --git a/packages/opencensus-web-propagation-b3/package.json b/packages/opencensus-web-propagation-b3/package.json
index d899ae74..4aea8384 100644
--- a/packages/opencensus-web-propagation-b3/package.json
+++ b/packages/opencensus-web-propagation-b3/package.json
@@ -55,7 +55,7 @@
     "karma-spec-reporter": "^0.0.32",
     "karma-webpack": "^4.0.2",
     "rimraf": "^3.0.0",
-    "ts-loader": "^6.0.4",
+    "ts-loader": "^9.0.0",
     "typescript": "^3.5.3",
     "webpack": "^4.39.3",
     "webpack-cli": "^4.0.0"
diff --git a/packages/opencensus-web-propagation-tracecontext/package.json b/packages/opencensus-web-propagation-tracecontext/package.json
index add4ad8e..a110d6fb 100644
--- a/packages/opencensus-web-propagation-tracecontext/package.json
+++ b/packages/opencensus-web-propagation-tracecontext/package.json
@@ -55,7 +55,7 @@
     "karma-spec-reporter": "0.0.32",
     "karma-webpack": "^4.0.0-rc.5",
     "rimraf": "^3.0.0",
-    "ts-loader": "^6.0.0",
+    "ts-loader": "^9.0.0",
     "typescript": "^3.1.6",
     "webpack": "^4.18.0",
     "webpack-cli": "^4.0.0"
diff --git a/packages/opencensus-web-scripts/package.json b/packages/opencensus-web-scripts/package.json
index 6854cfc0..ab8a52ca 100644
--- a/packages/opencensus-web-scripts/package.json
+++ b/packages/opencensus-web-scripts/package.json
@@ -60,7 +60,7 @@
     "karma-spec-reporter": "0.0.32",
     "karma-webpack": "^4.0.0-rc.5",
     "rimraf": "^3.0.0",
-    "ts-loader": "^6.0.0",
+    "ts-loader": "^9.0.0",
     "tslib": "^1.9.3",
     "typescript": "^3.3.3333",
     "webpack": "^4.39.1",