diff --git a/renovate.json b/renovate.json
index 7909174..b363d39 100644
--- a/renovate.json
+++ b/renovate.json
@@ -3,26 +3,29 @@
     "extends": ["local>actions/renovate-config"],
     "customManagers": [
         {
+            "customType": "regex",
             "description": "update runner in RUNNER_VERSION",
-            "fileMatch": ["RUNNER_VERSION"],
+            "fileMatch": ["^RUNNER_VERSION$"],
             "matchStrings": ["^(?<currentValue>v\\d+\\.\\d+\\.\\d+)$"],
             "datasourceTemplate": "docker",
             "depNameTemplate": "data.forgejo.org/forgejo/runner"
         },
         {
+            "customType": "regex",
             "description": "update runner in README.md",
-            "fileMatch": ["README.md"],
+            "fileMatch": ["^README.md$"],
             "matchStrings": [
-                "| runner-version | .+? | (?<currentValue>v\\d+\\.\\d+\\.\\d+) |"
+                "\\| runner-version \\| .+? \\| (?<currentValue>v\\d+\\.\\d+\\.\\d+) \\|"
             ],
             "datasourceTemplate": "docker",
             "depNameTemplate": "data.forgejo.org/forgejo/runner"
         },
         {
+            "customType": "regex",
             "description": "update runner in action.yml",
-            "fileMatch": ["action.yml"],
+            "fileMatch": ["^action.yml$"],
             "matchStrings": [
-                "\\s+runner-version:\\s+description: .+?\\s+default: (?<currentValue>v\\d+\\.\\d+\\.\\d+)\\s"
+                "\\s+runner-version:\\s+description: .+?\\s+default: '(?<currentValue>v\\d+\\.\\d+\\.\\d+)'\\s"
             ],
             "datasourceTemplate": "docker",
             "depNameTemplate": "data.forgejo.org/forgejo/runner"