diff --git a/github/github_test.go b/github/github_test.go
index 478efae..5a21e6a 100644
--- a/github/github_test.go
+++ b/github/github_test.go
@@ -240,7 +240,7 @@ func TestWebhooks(t *testing.T) {
 			filename: "../testdata/github/installation.json",
 			headers: http.Header{
 				"X-Github-Event":  []string{"installation"},
-				"X-Hub-Signature": []string{"sha1=2058cf6cc28570710afbc638e669f5c67305a2db"},
+				"X-Hub-Signature": []string{"sha1=2bcb4ad96133ce2dd6d140fad7a80a2b14407f7f"},
 			},
 		},
 		{
@@ -250,7 +250,7 @@ func TestWebhooks(t *testing.T) {
 			filename: "../testdata/github/installation-repositories.json",
 			headers: http.Header{
 				"X-Github-Event":  []string{"installation_repositories"},
-				"X-Hub-Signature": []string{"sha1=c587fbd9dd169db8ae592b3bcc80b08e2e6f4f45"},
+				"X-Hub-Signature": []string{"sha1=997680ef1e6f4a6b6595f5fa70b82989f505137f"},
 			},
 		},
 		{
diff --git a/testdata/github/installation-repositories.json b/testdata/github/installation-repositories.json
index 017c4fe..8ceb286 100644
--- a/testdata/github/installation-repositories.json
+++ b/testdata/github/installation-repositories.json
@@ -38,8 +38,8 @@
         "push",
         "pull_request"
       ],
-      "created_at": 1525109898,
-      "updated_at": 1525109899,
+      "created_at": "2022-03-02T18:02:51.000Z",
+      "updated_at": "2022-03-02T18:02:51.000Z",
       "single_file_name": "config.yml"
     },
     "repository_selection": "selected",
diff --git a/testdata/github/installation.json b/testdata/github/installation.json
index b62eb23..0562234 100644
--- a/testdata/github/installation.json
+++ b/testdata/github/installation.json
@@ -38,8 +38,8 @@
       "push",
       "pull_request"
     ],
-    "created_at": 1525109898,
-    "updated_at": 1525109899,
+    "created_at": "2022-03-02T18:02:51.000Z",
+    "updated_at": "2022-03-02T18:02:51.000Z",
     "single_file_name": "config.yml"
   },
   "repositories": [