diff --git a/src/Taskwarrior.php b/src/Taskwarrior.php
index ad72506..0c380b7 100644
--- a/src/Taskwarrior.php
+++ b/src/Taskwarrior.php
@@ -117,7 +117,7 @@ class Taskwarrior
         $file = tempnam(sys_get_temp_dir(), 'task') . '.json';
         $fs->dumpFile($file, $json);
 
-        $output = $this->command('import', $file);
+        $output = $this->command('import', null, [$file]);
 
         $fs->remove($file);
 
@@ -153,11 +153,7 @@ class Taskwarrior
         }
 
         if ($filter) {
-            if (strpos($filter, '(') !== false) {
-                $parts[] = "'" . $filter . "'";
-            } else {
-                $parts[] = $filter;
-            }
+            $parts[] = "( " . $filter . ' )';
         }
 
         $parts[] = $command;
@@ -166,7 +162,7 @@ class Taskwarrior
             $parts[] = $param;
         }
 
-        $process = new Process(implode(' ', $parts));
+        $process = new Process($this->createCommandLine($parts));
         $process->run();
 
         if (!$process->isSuccessful()) {
@@ -181,11 +177,11 @@ class Taskwarrior
      */
     public function version()
     {
-        if ($this->version) {
-            return $this->version;
+        if (!$this->version) {
+            $this->version = trim($this->command('_version'));
         }
 
-        return $this->version = trim($this->command('_version'));
+        return $this->version;
     }
 
     /**
@@ -261,6 +257,19 @@ class Taskwarrior
         return array_filter(explode("\n", $string), 'strlen');
     }
 
+    /**
+     * @param array $parts
+     * @return string
+     */
+    private function createCommandLine(array $parts)
+    {
+        $parts = array_map(function($part) {
+            return "'" . str_replace("'", "'\\''", $part) . "'";
+        }, $parts);
+
+        return implode(' ', $parts);
+    }
+
     /**
      * @param string $string
      * @return string|null
diff --git a/tests/TaskManagerTest.php b/tests/TaskManagerTest.php
index b354b9c..2b513bf 100644
--- a/tests/TaskManagerTest.php
+++ b/tests/TaskManagerTest.php
@@ -69,6 +69,32 @@ class TaskManagerTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals($task, $result);
     }
 
+    public function testUrlInDescription()
+    {
+        $task = new Task();
+        $task->setDescription('hier http://google.de ');
+
+        $this->taskManager->save($task);
+        $this->taskManager->clear();
+
+        $result = $this->taskManager->find($task->getUuid());
+
+        $this->assertEquals('hier http://google.de ', $result->getDescription());
+    }
+
+    public function testQuoteInDescription()
+    {
+        $task = new Task();
+        $task->setDescription(" test ' foo ");
+
+        $this->taskManager->save($task);
+        $this->taskManager->clear();
+
+        $result = $this->taskManager->find($task->getUuid());
+
+        $this->assertEquals(" test ' foo ", $result->getDescription());
+    }
+
     public function testSaveTaskWithoutDescription()
     {
         $this->setExpectedException('DavidBadura\Taskwarrior\Exception\TaskwarriorException');