diff --git a/dist/cache-save/index.js b/dist/cache-save/index.js
index 054361b7..92e7ef50 100644
--- a/dist/cache-save/index.js
+++ b/dist/cache-save/index.js
@@ -92709,6 +92709,7 @@ function getNodeVersionFromFile(versionFilePath) {
     catch {
         core.info('Node version file is not JSON file');
     }
+    const nodePrefix = 'node';
     let inRunsSection = false;
     for (const line of contents.split(/\r?\n/)) {
         const trimmedLine = line.trim();
@@ -92724,7 +92725,8 @@ function getNodeVersionFromFile(versionFilePath) {
             break;
         }
         const separatorIndex = trimmedLine.indexOf(':');
-        if (trimmedLine.slice(0, separatorIndex) !== 'using') {
+        if (separatorIndex <= 0 ||
+            trimmedLine.slice(0, separatorIndex) !== 'using') {
             continue;
         }
         let runtime = trimmedLine.slice(separatorIndex + 1).trim();
@@ -92733,8 +92735,9 @@ function getNodeVersionFromFile(versionFilePath) {
             (runtime.startsWith('"') && runtime.endsWith('"'))) {
             runtime = runtime.slice(1, -1);
         }
-        if (runtime.startsWith('node') && /^\d+$/.test(runtime.slice(4))) {
-            return runtime.slice(4);
+        if (runtime.startsWith(nodePrefix) &&
+            /^\d+$/.test(runtime.slice(nodePrefix.length))) {
+            return runtime.slice(nodePrefix.length);
         }
     }
     const found = contents.match(/^(?:node(js)?\s+)?v?(?<version>[^\s]+)$/m);
diff --git a/dist/setup/index.js b/dist/setup/index.js
index 55eab84d..dcc17212 100644
--- a/dist/setup/index.js
+++ b/dist/setup/index.js
@@ -98103,6 +98103,7 @@ function getNodeVersionFromFile(versionFilePath) {
     catch {
         core_info('Node version file is not JSON file');
     }
+    const nodePrefix = 'node';
     let inRunsSection = false;
     for (const line of contents.split(/\r?\n/)) {
         const trimmedLine = line.trim();
@@ -98118,7 +98119,8 @@ function getNodeVersionFromFile(versionFilePath) {
             break;
         }
         const separatorIndex = trimmedLine.indexOf(':');
-        if (trimmedLine.slice(0, separatorIndex) !== 'using') {
+        if (separatorIndex <= 0 ||
+            trimmedLine.slice(0, separatorIndex) !== 'using') {
             continue;
         }
         let runtime = trimmedLine.slice(separatorIndex + 1).trim();
@@ -98127,8 +98129,9 @@ function getNodeVersionFromFile(versionFilePath) {
             (runtime.startsWith('"') && runtime.endsWith('"'))) {
             runtime = runtime.slice(1, -1);
         }
-        if (runtime.startsWith('node') && /^\d+$/.test(runtime.slice(4))) {
-            return runtime.slice(4);
+        if (runtime.startsWith(nodePrefix) &&
+            /^\d+$/.test(runtime.slice(nodePrefix.length))) {
+            return runtime.slice(nodePrefix.length);
         }
     }
     const found = contents.match(/^(?:node(js)?\s+)?v?(?<version>[^\s]+)$/m);
diff --git a/src/util.ts b/src/util.ts
index 938bb861..085f929f 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -68,6 +68,7 @@ export function getNodeVersionFromFile(versionFilePath: string): string | null {
     core.info('Node version file is not JSON file');
   }
 
+  const nodePrefix = 'node';
   let inRunsSection = false;
   for (const line of contents.split(/\r?\n/)) {
     const trimmedLine = line.trim();
@@ -85,7 +86,10 @@ export function getNodeVersionFromFile(versionFilePath: string): string | null {
     }
 
     const separatorIndex = trimmedLine.indexOf(':');
-    if (trimmedLine.slice(0, separatorIndex) !== 'using') {
+    if (
+      separatorIndex <= 0 ||
+      trimmedLine.slice(0, separatorIndex) !== 'using'
+    ) {
       continue;
     }
 
@@ -97,8 +101,11 @@ export function getNodeVersionFromFile(versionFilePath: string): string | null {
     ) {
       runtime = runtime.slice(1, -1);
     }
-    if (runtime.startsWith('node') && /^\d+$/.test(runtime.slice(4))) {
-      return runtime.slice(4);
+    if (
+      runtime.startsWith(nodePrefix) &&
+      /^\d+$/.test(runtime.slice(nodePrefix.length))
+    ) {
+      return runtime.slice(nodePrefix.length);
     }
   }