diff --git a/__tests__/utils.test.ts b/__tests__/utils.test.ts
index eac39ab6..9d3185d3 100644
--- a/__tests__/utils.test.ts
+++ b/__tests__/utils.test.ts
@@ -129,6 +129,30 @@ describe('Version from file test', () => {
       expect(_fn(pythonVersionFilePath)).toEqual([pythonVersion]);
     }
   );
+  it.each([getVersionInputFromTomlFile, getVersionInputFromFile])(
+    'Version from mise .mise.toml test',
+    async _fn => {
+      await io.mkdirP(tempDir);
+      const pythonVersionFileName = '.mise.toml';
+      const pythonVersionFilePath = path.join(tempDir, pythonVersionFileName);
+      const pythonVersion = '3.7.0';
+      const pythonVersionFileContent = `[tools]\npython = "${pythonVersion}"`;
+      fs.writeFileSync(pythonVersionFilePath, pythonVersionFileContent);
+      expect(_fn(pythonVersionFilePath)).toEqual([pythonVersion]);
+    }
+  );
+  it.each([getVersionInputFromTomlFile, getVersionInputFromFile])(
+    'Version from mise verbose .mise.toml test',
+    async _fn => {
+      await io.mkdirP(tempDir);
+      const pythonVersionFileName = '.mise.toml';
+      const pythonVersionFilePath = path.join(tempDir, pythonVersionFileName);
+      const pythonVersion = '3.7.0';
+      const pythonVersionFileContent = `[tools]\npython = { version="${pythonVersion}", virtualenv=".venv" }`;
+      fs.writeFileSync(pythonVersionFilePath, pythonVersionFileContent);
+      expect(_fn(pythonVersionFilePath)).toEqual([pythonVersion]);
+    }
+  );
   it.each([getVersionInputFromTomlFile, getVersionInputFromFile])(
     'Version undefined',
     async _fn => {
diff --git a/dist/setup/index.js b/dist/setup/index.js
index e56f9660..06717ff7 100644
--- a/dist/setup/index.js
+++ b/dist/setup/index.js
@@ -92094,6 +92094,9 @@ function getOSInfo() {
     });
 }
 exports.getOSInfo = getOSInfo;
+function isString(value) {
+    return typeof value === 'string' || value instanceof String;
+}
 /**
  * Extract a value from an object by following the keys path provided.
  * If the value is present, it is returned. Otherwise undefined is returned.
@@ -92104,9 +92107,12 @@ function extractValue(obj, keys) {
         if (keys.length > 1 && value !== undefined) {
             return extractValue(value, keys.slice(1));
         }
-        else {
+        else if (isString(value)) {
             return value;
         }
+        else {
+            return;
+        }
     }
     else {
         return;
@@ -92126,19 +92132,26 @@ function getVersionInputFromTomlFile(versionFile) {
     // Normalize the line endings in the pyprojectFile
     pyprojectFile = pyprojectFile.replace(/\r\n/g, '\n');
     const pyprojectConfig = toml.parse(pyprojectFile);
-    let keys = [];
+    let keyPaths = [];
     if ('project' in pyprojectConfig) {
         // standard project metadata (PEP 621)
-        keys = ['project', 'requires-python'];
+        keyPaths = [['project', 'requires-python']];
     }
     else {
-        // python poetry
-        keys = ['tool', 'poetry', 'dependencies', 'python'];
+        keyPaths = [
+            // python poetry
+            ['tool', 'poetry', 'dependencies', 'python'],
+            // mise
+            ['tools', 'python'],
+            ['tools', 'python', 'version']
+        ];
     }
     const versions = [];
-    const version = extractValue(pyprojectConfig, keys);
-    if (version !== undefined) {
-        versions.push(version);
+    for (const keys of keyPaths) {
+        const value = extractValue(pyprojectConfig, keys);
+        if (value !== undefined) {
+            versions.push(value);
+        }
     }
     core.info(`Extracted ${versions} from ${versionFile}`);
     const rawVersions = Array.from(versions, version => version.split(',').join(' '));
diff --git a/src/utils.ts b/src/utils.ts
index a6dab63e..85eded14 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -202,6 +202,10 @@ export async function getOSInfo() {
   }
 }
 
+function isString(value: unknown): value is string {
+  return typeof value === 'string' || value instanceof String;
+}
+
 /**
  * Extract a value from an object by following the keys path provided.
  * If the value is present, it is returned. Otherwise undefined is returned.
@@ -211,8 +215,10 @@ function extractValue(obj: any, keys: string[]): string | undefined {
     const value = obj[keys[0]];
     if (keys.length > 1 && value !== undefined) {
       return extractValue(value, keys.slice(1));
-    } else {
+    } else if (isString(value)) {
       return value;
+    } else {
+      return;
     }
   } else {
     return;
@@ -235,19 +241,29 @@ export function getVersionInputFromTomlFile(versionFile: string): string[] {
   pyprojectFile = pyprojectFile.replace(/\r\n/g, '\n');
 
   const pyprojectConfig = toml.parse(pyprojectFile);
-  let keys = [];
+
+  let keyPaths = [];
 
   if ('project' in pyprojectConfig) {
     // standard project metadata (PEP 621)
-    keys = ['project', 'requires-python'];
+    keyPaths = [['project', 'requires-python']];
   } else {
-    // python poetry
-    keys = ['tool', 'poetry', 'dependencies', 'python'];
+    keyPaths = [
+      // python poetry
+      ['tool', 'poetry', 'dependencies', 'python'],
+      // mise
+      ['tools', 'python'],
+      ['tools', 'python', 'version']
+    ];
   }
+
   const versions = [];
-  const version = extractValue(pyprojectConfig, keys);
-  if (version !== undefined) {
-    versions.push(version);
+
+  for (const keys of keyPaths) {
+    const value = extractValue(pyprojectConfig, keys);
+    if (value !== undefined) {
+      versions.push(value);
+    }
   }
 
   core.info(`Extracted ${versions} from ${versionFile}`);