diff --git a/SwiftTask.xcodeproj/project.pbxproj b/SwiftTask.xcodeproj/project.pbxproj
index 7afd54e..c6cc96e 100644
--- a/SwiftTask.xcodeproj/project.pbxproj
+++ b/SwiftTask.xcodeproj/project.pbxproj
@@ -306,9 +306,11 @@
 				TargetAttributes = {
 					1F46DED3199EDF1000F97868 = {
 						CreatedOnToolsVersion = 6.0;
+						LastSwiftMigration = 0800;
 					};
 					1F46DEDE199EDF1000F97868 = {
 						CreatedOnToolsVersion = 6.0;
+						LastSwiftMigration = 0800;
 					};
 					4822F0CF19D00ABF00F5F572 = {
 						CreatedOnToolsVersion = 6.0.1;
@@ -518,6 +520,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.inamiy.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(PROJECT_NAME)";
 				SKIP_INSTALL = YES;
+				SWIFT_VERSION = 2.3;
 			};
 			name = Debug;
 		};
@@ -537,6 +540,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.inamiy.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(PROJECT_NAME)";
 				SKIP_INSTALL = YES;
+				SWIFT_VERSION = 2.3;
 			};
 			name = Release;
 		};
@@ -554,6 +558,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.inamiy.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
+				SWIFT_VERSION = 2.3;
 			};
 			name = Debug;
 		};
@@ -567,6 +572,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.inamiy.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
+				SWIFT_VERSION = 2.3;
 			};
 			name = Release;
 		};
@@ -583,6 +589,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.inamiy.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = iphoneos;
+				SWIFT_VERSION = 2.3;
 			};
 			name = Debug;
 		};
@@ -595,6 +602,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.inamiy.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = iphoneos;
+				SWIFT_VERSION = 2.3;
 				VALIDATE_PRODUCT = YES;
 			};
 			name = Release;
diff --git a/SwiftTask/SwiftTask.swift b/SwiftTask/SwiftTask.swift
index 7fec21b..5008326 100644
--- a/SwiftTask/SwiftTask.swift
+++ b/SwiftTask/SwiftTask.swift
@@ -185,6 +185,14 @@ public class Task<Progress, Value, Error>: Cancellable, CustomStringConvertible
         })
         self.name = "RejectedTask"
     }
+
+    private convenience init(_errorInfo: ErrorInfo)
+    {
+        self.init(_initClosure: { _, progress, fulfill, _reject, configure in
+            _reject(_errorInfo)
+        })
+        self.name = "RejectedTask"
+    }
     
     ///
     /// Create promise-like task which only allows fulfill & reject (no progress & configure)
@@ -310,18 +318,24 @@ public class Task<Progress, Value, Error>: Cancellable, CustomStringConvertible
         clonedTask.name = "\(self.name)-clone"
         return clonedTask
     }
-    
+
     /// Returns new task that is retryable for `maxRetryCount (= maxTryCount-1)` times.
-    public func retry(maxRetryCount: Int) -> Task
+    /// - Parameter condition: Predicate that will be evaluated on each retry timing.
+    public func retry(maxRetryCount: Int, condition: (ErrorInfo -> Bool) = { _ in true }) -> Task
     {
-        if maxRetryCount < 1 { return self }
-        
+        guard maxRetryCount > 0 else { return self }
+
         return Task { machine, progress, fulfill, _reject, configure in
             
             let task = self.progress { _, progressValue in
                 progress(progressValue)
-            }.failure { [unowned self] _ -> Task in
-                return self.clone().retry(maxRetryCount-1) // clone & try recursively
+            }.failure { [unowned self] errorInfo -> Task in
+                if condition(errorInfo) {
+                    return self.clone().retry(maxRetryCount-1, condition: condition) // clone & try recursively
+                }
+                else {
+                    return Task(_errorInfo: errorInfo)
+                }
             }
                 
             task.progress { _, progressValue in
diff --git a/SwiftTaskTests/SwiftTaskTests.swift b/SwiftTaskTests/SwiftTaskTests.swift
index b7fedd6..f88e753 100644
--- a/SwiftTaskTests/SwiftTaskTests.swift
+++ b/SwiftTaskTests/SwiftTaskTests.swift
@@ -892,6 +892,41 @@ class SwiftTaskTests: _TestCase
         XCTAssertEqual(actualTryCount, maxTryCount, "`actualTryCount` should reach `maxTryCount` because task keeps rejected and never fulfilled.")
     }
     
+    func testRetry_condition()
+    {
+        // NOTE: this is async test
+        if !self.isAsync { return }
+        
+        let expect = self.expectationWithDescription(#function)
+        let maxTryCount = 4
+        var actualTryCount = 0
+        
+        Task<Float, String, ErrorString> { progress, fulfill, reject, configure in
+            
+            self.perform {
+                actualTryCount += 1
+                reject("ERROR \(actualTryCount)")
+            }
+            
+        }.retry(maxTryCount-1) { error, isCancelled -> Bool in
+            XCTAssertNotEqual(error!, "ERROR 0", "Should not evaluate retry condition on first try. It is not retry.")
+            return actualTryCount < 3
+        }.failure { error, isCancelled -> String in
+            
+            XCTAssertEqual(error!, "ERROR 3")
+            XCTAssertFalse(isCancelled)
+            
+            expect.fulfill()
+            
+            return "DUMMY"
+            
+        }
+        
+        self.wait()
+        
+        XCTAssertEqual(actualTryCount, 3)
+    }
+    
     func testRetry_progress()
     {
         // NOTE: this is async test