diff --git a/packages/nomnoml/package-lock.json b/packages/nomnoml/package-lock.json
index 5a638f1..931e08e 100644
--- a/packages/nomnoml/package-lock.json
+++ b/packages/nomnoml/package-lock.json
@@ -336,6 +336,12 @@
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 					"dev": true
 				},
+				"typescript": {
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+					"resolved": "https://registry.npmjs.org/typescript/-/typescript-3.7.7.tgz",
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 					"resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -4741,9 +4747,9 @@
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+			"version": "3.9.10",
+			"resolved": "https://registry.npmjs.org/typescript/-/typescript-3.9.10.tgz",
+			"integrity": "sha512-w6fIxVE/H1PkLKcCPsFqKE7Kv7QUwhU8qQY2MueZXWx5cPZdwFupLgKK3vntcK98BtNHZtAF4LA/yl2a7k8R6Q==",
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diff --git a/packages/nomnoml/package.json b/packages/nomnoml/package.json
index 976bb38..3dc2531 100644
--- a/packages/nomnoml/package.json
+++ b/packages/nomnoml/package.json
@@ -65,6 +65,6 @@
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-    "typescript": "~3.7.5"
+    "typescript": "~3.9.10"
   }
 }
diff --git a/packages/plantuml/package-lock.json b/packages/plantuml/package-lock.json
index e633da0..402cd00 100644
--- a/packages/plantuml/package-lock.json
+++ b/packages/plantuml/package-lock.json
@@ -336,6 +336,12 @@
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 					"dev": true
 				},
+				"typescript": {
+					"version": "3.7.7",
+					"resolved": "https://registry.npmjs.org/typescript/-/typescript-3.7.7.tgz",
+					"integrity": "sha512-MmQdgo/XenfZPvVLtKZOq9jQQvzaUAUpcKW8Z43x9B2fOm4S5g//tPtMweZUIP+SoBqrVPEIm+dJeQ9dfO0QdA==",
+					"dev": true
+				},
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 					"resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -4753,9 +4759,9 @@
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+			"version": "3.9.10",
+			"resolved": "https://registry.npmjs.org/typescript/-/typescript-3.9.10.tgz",
+			"integrity": "sha512-w6fIxVE/H1PkLKcCPsFqKE7Kv7QUwhU8qQY2MueZXWx5cPZdwFupLgKK3vntcK98BtNHZtAF4LA/yl2a7k8R6Q==",
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diff --git a/packages/plantuml/package.json b/packages/plantuml/package.json
index 32834b4..f4d7974 100644
--- a/packages/plantuml/package.json
+++ b/packages/plantuml/package.json
@@ -65,6 +65,6 @@
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     "eslint-plugin-mocha": "^6.2.2",
     "source-map-support": "^0.5.16",
-    "typescript": "~3.7.5"
+    "typescript": "~3.9.10"
   }
 }