diff --git a/Mac/BuildScript/README.txt b/Mac/BuildScript/README.txt
index 6c08dbea7ed..e070e609434 100644
--- a/Mac/BuildScript/README.txt
+++ b/Mac/BuildScript/README.txt
@@ -57,18 +57,18 @@ for each release.
 
         * NCurses 5.9 (http://bugs.python.org/issue15037)
         * SQLite 3.7.13
-        * Tcl 8.5.14
-        * Tk 8.5.14
+        * Tcl 8.5.15
+        * Tk 8.5.15
         * XZ 5.0.3
 
     - uses system-supplied versions of third-party libraries
 
         * readline module links with Apple BSD editline (libedit)
 
-    - requires ActiveState Tcl/Tk 8.5.14 (or later) to be installed for building
+    - requires ActiveState Tcl/Tk 8.5.15 (or later) to be installed for building
 
         * Beginning with Python 3.4 alpha2, this installer now includes its own
-          private copy of Tcl and Tk 8.5.14 libraries and thus is no longer
+          private copy of Tcl and Tk 8.5.15 libraries and thus is no longer
           dependent on the buggy releases of Aqua Cocoa Tk 8.5 shipped with
           OS X 10.6 or on installing a newer third-party version of Tcl/Tk
           in /Library/Frameworks, such as from ActiveState.  Because this
diff --git a/Mac/BuildScript/build-installer.py b/Mac/BuildScript/build-installer.py
index d2a74453935..b1f0a78d2cc 100755
--- a/Mac/BuildScript/build-installer.py
+++ b/Mac/BuildScript/build-installer.py
@@ -196,9 +196,9 @@ def library_recipes():
     if DEPTARGET > '10.5':
         result.extend([
           dict(
-              name="Tcl 8.5.14",
-              url="ftp://ftp.tcl.tk/pub/tcl//tcl8_5/tcl8.5.14-src.tar.gz",
-              checksum='44b50e58ab45dd272f6714dce2129123',
+              name="Tcl 8.5.15",
+              url="ftp://ftp.tcl.tk/pub/tcl//tcl8_5/tcl8.5.15-src.tar.gz",
+              checksum='f3df162f92c69b254079c4d0af7a690f',
               buildDir="unix",
               configure_pre=[
                     '--enable-shared',
@@ -212,9 +212,9 @@ def library_recipes():
                   },
               ),
           dict(
-              name="Tk 8.5.14",
-              url="ftp://ftp.tcl.tk/pub/tcl//tcl8_5/tk8.5.14-src.tar.gz",
-              checksum='a9c48921b3688020470cd3a6dd4e867d',
+              name="Tk 8.5.15",
+              url="ftp://ftp.tcl.tk/pub/tcl//tcl8_5/tk8.5.15-src.tar.gz",
+              checksum='55b8e33f903210a4e1c8bce0f820657f',
               buildDir="unix",
               configure_pre=[
                     '--enable-aqua',
diff --git a/Misc/NEWS b/Misc/NEWS
index 1f74e5262ac..228416c1e30 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -188,6 +188,7 @@ Build
 
 - Issue #19130: Correct PCbuild/readme.txt, Python 3.3 and 3.4 require VS 2010.
 
+- Issue #15663: Update OS X 10.6+ installer to use Tcl/Tk 8.5.15.
 
 What's New in Python 3.4.0 Alpha 3?
 ===================================