diff --git a/dist/setup-pdm.js b/dist/setup-pdm.js
index d4e9ae7..d2b32fd 100644
--- a/dist/setup-pdm.js
+++ b/dist/setup-pdm.js
@@ -6180,7 +6180,7 @@ async function run() {
   const arch2 = core3.getInput("architecture") || os2.arch();
   const pdmVersion = core3.getInput("version");
   const pdmPackage = pdmVersion ? `pdm==${pdmVersion}` : "pdm";
-  const cmdArgs = ["-m", "pip", "install", "-U", pdmPackage];
+  const cmdArgs = ["-m", "pip", "install", "-U", pdmPackage, "toml"];
   if (core3.getInput("prerelease") === "true") {
     cmdArgs.push("--pre");
   }
diff --git a/src/setup-pdm.ts b/src/setup-pdm.ts
index 83357f7..b59bec3 100644
--- a/src/setup-pdm.ts
+++ b/src/setup-pdm.ts
@@ -21,7 +21,7 @@ async function run(): Promise<void> {
   const arch = core.getInput('architecture') || os.arch();
   const pdmVersion = core.getInput('version');
   const pdmPackage = pdmVersion ? `pdm==${pdmVersion}` : 'pdm';
-  const cmdArgs = ['-m', 'pip', 'install', '-U', pdmPackage];
+  const cmdArgs = ['-m', 'pip', 'install', '-U', pdmPackage, 'toml'];
   if (core.getInput('prerelease') === 'true') {
     cmdArgs.push('--pre');
   }