diff --git a/30_sources/SRC_Zupfnoter/src/package-lock.json b/30_sources/SRC_Zupfnoter/src/package-lock.json
index 054a6664..0b4ac47f 100644
--- a/30_sources/SRC_Zupfnoter/src/package-lock.json
+++ b/30_sources/SRC_Zupfnoter/src/package-lock.json
@@ -21,7 +21,7 @@
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-      "resolved": "http://registry.npmjs.org/acorn/-/acorn-2.7.0.tgz",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-2.7.0.tgz",
       "integrity": "sha1-q259nYhqrKiwhbwzEreaGYQz8Oc="
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@@ -65,12 +65,21 @@
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-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
-      "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
-      "requires": {
-        "co": "^4.6.0",
-        "json-stable-stringify": "^1.0.1"
+      "version": "6.12.3",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.3.tgz",
+      "integrity": "sha512-4K0cK3L1hsqk9xIb2z9vs/XU+PGJZ9PNpJRDS9YLzmNdX6jmVPfamLvTJr0aDAusnHyCHO6MjzlkAsgtqp9teA==",
+      "requires": {
+        "fast-deep-equal": "^3.1.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      },
+      "dependencies": {
+        "fast-deep-equal": {
+          "version": "3.1.3",
+          "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz",
+          "integrity": "sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q=="
+        }
       }
     },
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@@ -474,11 +483,6 @@
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-    "co": {
-      "version": "4.6.0",
-      "resolved": "https://registry.npmjs.org/co/-/co-4.6.0.tgz",
-      "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ="
-    },
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       "resolved": "https://registry.npmjs.org/combine-source-map/-/combine-source-map-0.8.0.tgz",
@@ -1089,14 +1093,6 @@
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-    "json-stable-stringify": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/json-stable-stringify/-/json-stable-stringify-1.0.1.tgz",
-      "integrity": "sha1-mnWdOcXy/1A/1TAGRu1EX4jE+a8=",
-      "requires": {
-        "jsonify": "~0.0.0"
-      }
-    },
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       "resolved": "https://registry.npmjs.org/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz",
@@ -1105,7 +1101,8 @@
     "jsonify": {
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       "resolved": "https://registry.npmjs.org/jsonify/-/jsonify-0.0.0.tgz",
-      "integrity": "sha1-LHS27kHZPKUbe1qu6PUDYx0lKnM="
+      "integrity": "sha1-LHS27kHZPKUbe1qu6PUDYx0lKnM=",
+      "dev": true
     },
     "jsonparse": {
       "version": "1.3.1",
diff --git a/30_sources/SRC_Zupfnoter/src/package.json b/30_sources/SRC_Zupfnoter/src/package.json
index 4d7ab7c7..cf37d296 100644
--- a/30_sources/SRC_Zupfnoter/src/package.json
+++ b/30_sources/SRC_Zupfnoter/src/package.json
@@ -7,7 +7,7 @@
     "doc": "doc"
   },
   "dependencies": {
-    "ajv": "^4.8.2",
+    "ajv": "^6.12.3",
     "blob": "^0.0.4",
     "encoding": "^0.1.12",
     "glob": "^7.1.3",