diff --git a/dist/index.js b/dist/index.js
index 6d31fde..89e776f 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -11497,8 +11497,16 @@ function getRustTarget(args) {
     return ((_c = TARGET_ALIASES[process.platform]) === null || _c === void 0 ? void 0 : _c[target]) || target;
 }
 function getManifestDir(args) {
+    const workspace = process.env.GITHUB_WORKSPACE;
+    let workdir = core.getInput('working-directory');
+    if (workdir.length > 0) {
+        workdir = path.join(workspace, workdir);
+    }
+    else {
+        workdir = workspace;
+    }
     const manifestPath = getCliValue(args, '--manifest-path') || getCliValue(args, '-m');
-    return manifestPath ? path.dirname(manifestPath) : process.cwd();
+    return manifestPath ? path.dirname(path.join(workdir, manifestPath)) : workdir;
 }
 function parseRustToolchain(content) {
     const toml = (0, toml_1.parse)(content.toString());
@@ -11581,7 +11589,7 @@ async function findVersion(args) {
             const maturin = requires.find(req => req.startsWith('maturin'));
             if (maturin) {
                 core.info(`Found maturin version requirement ${maturin} specified in pyproject.toml`);
-                const versionSpec = pythonVersionToSemantic(maturin.replace('maturin', '').replace(',', ' '));
+                const versionSpec = pythonVersionToSemantic(maturin.replace('maturin', '').replace(',', ' ').replace('==', '='));
                 core.debug(`maturin version spec: ${versionSpec}`);
                 const release = await findReleaseFromManifest(versionSpec, 'x64');
                 if (release) {
@@ -11594,10 +11602,12 @@ async function findVersion(args) {
                 }
             }
             else {
+                core.info('maturin not found in [build-system.requires] section at ${pyprojectToml}, fallback to latest');
                 version = 'latest';
             }
         }
         else {
+            core.info('No pyproject.toml found at ${pyprojectToml}, fallback to latest');
             version = 'latest';
         }
     }
diff --git a/src/index.ts b/src/index.ts
index a1f68e1..2e3dac6 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -176,9 +176,17 @@ function getRustTarget(args: string[]): string {
 }
 
 function getManifestDir(args: string[]): string {
+  // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+  const workspace = process.env.GITHUB_WORKSPACE!
+  let workdir = core.getInput('working-directory')
+  if (workdir.length > 0) {
+    workdir = path.join(workspace, workdir)
+  } else {
+    workdir = workspace
+  }
   const manifestPath =
     getCliValue(args, '--manifest-path') || getCliValue(args, '-m')
-  return manifestPath ? path.dirname(manifestPath) : process.cwd()
+  return manifestPath ? path.dirname(path.join(workdir, manifestPath)) : workdir
 }
 
 function parseRustToolchain(content: string): string {
@@ -297,7 +305,7 @@ async function findVersion(args: string[]): Promise<string> {
           `Found maturin version requirement ${maturin} specified in pyproject.toml`
         )
         const versionSpec = pythonVersionToSemantic(
-          maturin.replace('maturin', '').replace(',', ' ')
+          maturin.replace('maturin', '').replace(',', ' ').replace('==', '=')
         )
         core.debug(`maturin version spec: ${versionSpec}`)
         const release = await findReleaseFromManifest(versionSpec, 'x64')
@@ -311,9 +319,15 @@ async function findVersion(args: string[]): Promise<string> {
           version = 'latest'
         }
       } else {
+        core.info(
+          'maturin not found in [build-system.requires] section at ${pyprojectToml}, fallback to latest'
+        )
         version = 'latest'
       }
     } else {
+      core.info(
+        'No pyproject.toml found at ${pyprojectToml}, fallback to latest'
+      )
       version = 'latest'
     }
   } else if (version !== 'latest') {