diff --git a/__tests__/tested-version.test.ts b/__tests__/tested-version.test.ts
index 2e0412d53..6979030b1 100644
--- a/__tests__/tested-version.test.ts
+++ b/__tests__/tested-version.test.ts
@@ -24,10 +24,12 @@ describe("[env variable mock]", () => {
     "Tested up to: 0.42",
     "Tested up to:0.42",
     "LINE1\nNot Tested up to: 0.41\nTested up to: 0.42\nLINE2",
+    "LINE1\r\nNot Tested up to: 0.41\r\nTested up to: 0.42\r\nLINE2",
     " Tested up to: 0.42",
     "    Tested up to: 0.42",
     "\tTested up to: 0.42",
     "\nTested up to: 0.42\n",
+    "\r\nTested up to: 0.42\r\n",
     "Tested up to:      0.42",
   ])("testedVersion works correctly", async (readme) => {
     expect.assertions(1);
diff --git a/dist/index.js b/dist/index.js
index 90a3e9012..7a7b1441f 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -10612,7 +10612,7 @@ function readme(config) {
 function testedVersion(config) {
     return __awaiter(this, void 0, void 0, function* () {
         const readmeContents = yield readme(config);
-        for (const line of readmeContents.split("\n")) {
+        for (const line of readmeContents.split(/\r?\n/)) {
             const matches = [...line.matchAll(/^[\s]*Tested up to:[\s]*([.\d]+)$/g)];
             if (matches.length !== 1) {
                 continue;
diff --git a/src/tested-version.ts b/src/tested-version.ts
index b85e8e221..a12cbf9af 100644
--- a/src/tested-version.ts
+++ b/src/tested-version.ts
@@ -36,7 +36,7 @@ async function readme(config: Config): Promise<string> {
 
 export async function testedVersion(config: Config): Promise<string> {
   const readmeContents = await readme(config);
-  for (const line of readmeContents.split("\n")) {
+  for (const line of readmeContents.split(/\r?\n/)) {
     const matches = [...line.matchAll(/^[\s]*Tested up to:[\s]*([.\d]+)$/g)];
     if (matches.length !== 1) {
       continue;