diff --git a/quiz-app-mean/package-lock.json b/quiz-app-mean/package-lock.json
index fff4265..33519fc 100644
--- a/quiz-app-mean/package-lock.json
+++ b/quiz-app-mean/package-lock.json
@@ -22,6 +22,23 @@
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         "rxjs": "6.6.7"
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+          "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-6.6.7.tgz",
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+          "dev": true,
+          "requires": {
+            "tslib": "^1.9.0"
+          }
+        },
+        "tslib": {
+          "version": "1.14.1",
+          "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
+          "integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==",
+          "dev": true
+        }
       }
     },
     "@angular-devkit/build-angular": {
@@ -391,6 +408,23 @@
             "path-is-absolute": "^1.0.0"
           }
         },
+        "rxjs": {
+          "version": "6.6.7",
+          "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-6.6.7.tgz",
+          "integrity": "sha512-hTdwr+7yYNIT5n4AMYp85KA6yw2Va0FLa3Rguvbpa4W3I5xynaBZo41cM3XM+4Q6fRMj3sBYIR1VAmZMXYJvRQ==",
+          "dev": true,
+          "requires": {
+            "tslib": "^1.9.0"
+          },
+          "dependencies": {
+            "tslib": {
+              "version": "1.14.1",
+              "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
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+              "dev": true
+            }
+          }
+        },
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           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
@@ -432,6 +466,23 @@
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         "rxjs": "6.6.7"
+      },
+      "dependencies": {
+        "rxjs": {
+          "version": "6.6.7",
+          "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-6.6.7.tgz",
+          "integrity": "sha512-hTdwr+7yYNIT5n4AMYp85KA6yw2Va0FLa3Rguvbpa4W3I5xynaBZo41cM3XM+4Q6fRMj3sBYIR1VAmZMXYJvRQ==",
+          "dev": true,
+          "requires": {
+            "tslib": "^1.9.0"
+          }
+        },
+        "tslib": {
+          "version": "1.14.1",
+          "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
+          "integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==",
+          "dev": true
+        }
       }
     },
     "@angular-devkit/core": {
@@ -465,6 +516,21 @@
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           "dev": true
+        },
+        "rxjs": {
+          "version": "6.6.7",
+          "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-6.6.7.tgz",
+          "integrity": "sha512-hTdwr+7yYNIT5n4AMYp85KA6yw2Va0FLa3Rguvbpa4W3I5xynaBZo41cM3XM+4Q6fRMj3sBYIR1VAmZMXYJvRQ==",
+          "dev": true,
+          "requires": {
+            "tslib": "^1.9.0"
+          }
+        },
+        "tslib": {
+          "version": "1.14.1",
+          "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
+          "integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==",
+          "dev": true
         }
       }
     },
@@ -477,6 +543,23 @@
         "@angular-devkit/core": "12.2.7",
         "ora": "5.4.1",
         "rxjs": "6.6.7"
+      },
+      "dependencies": {
+        "rxjs": {
+          "version": "6.6.7",
+          "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-6.6.7.tgz",
+          "integrity": "sha512-hTdwr+7yYNIT5n4AMYp85KA6yw2Va0FLa3Rguvbpa4W3I5xynaBZo41cM3XM+4Q6fRMj3sBYIR1VAmZMXYJvRQ==",
+          "dev": true,
+          "requires": {
+            "tslib": "^1.9.0"
+          }
+        },
+        "tslib": {
+          "version": "1.14.1",
+          "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
+          "integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==",
+          "dev": true
+        }
       }
     },
     "@angular/animations": {
@@ -5119,6 +5202,15 @@
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           "dev": true
         },
+        "rxjs": {
+          "version": "6.6.7",
+          "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-6.6.7.tgz",
+          "integrity": "sha512-hTdwr+7yYNIT5n4AMYp85KA6yw2Va0FLa3Rguvbpa4W3I5xynaBZo41cM3XM+4Q6fRMj3sBYIR1VAmZMXYJvRQ==",
+          "dev": true,
+          "requires": {
+            "tslib": "^1.9.0"
+          }
+        },
         "source-map": {
           "version": "0.5.7",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
@@ -12471,18 +12563,11 @@
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-      "version": "6.6.7",
-      "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-6.6.7.tgz",
-      "integrity": "sha512-hTdwr+7yYNIT5n4AMYp85KA6yw2Va0FLa3Rguvbpa4W3I5xynaBZo41cM3XM+4Q6fRMj3sBYIR1VAmZMXYJvRQ==",
+      "version": "7.8.0",
+      "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-7.8.0.tgz",
+      "integrity": "sha512-F2+gxDshqmIub1KdvZkaEfGDwLNpPvk9Fs6LD/MyQxNgMds/WH9OdDDXOmxUZpME+iSK3rQCctkL0DYyytUqMg==",
       "requires": {
-        "tslib": "^1.9.0"
-      },
-      "dependencies": {
-        "tslib": {
-          "version": "1.14.1",
-          "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
-          "integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg=="
-        }
+        "tslib": "^2.1.0"
       }
     },
     "safe-buffer": {
diff --git a/quiz-app-mean/package.json b/quiz-app-mean/package.json
index 3baf7b4..98dc581 100644
--- a/quiz-app-mean/package.json
+++ b/quiz-app-mean/package.json
@@ -28,7 +28,7 @@
     "bootstrap": "5.1.0",
     "chart.js": "2.9.4",
     "hammerjs": "2.0.8",
-    "rxjs": "6.6.7",
+    "rxjs": "7.8.0",
     "tslib": "2.3.1",
     "zone.js": "0.11.4"
   },