diff --git a/Misc/NEWS.d/next/Windows/2020-09-24-23-09-40.bpo-39107.GbUZvD.rst b/Misc/NEWS.d/next/Windows/2020-09-24-23-09-40.bpo-39107.GbUZvD.rst
new file mode 100644
index 00000000000..889ad481404
--- /dev/null
+++ b/Misc/NEWS.d/next/Windows/2020-09-24-23-09-40.bpo-39107.GbUZvD.rst
@@ -0,0 +1 @@
+Update Tcl and Tk to 8.6.10 in Windows installer.
diff --git a/PCbuild/get_externals.bat b/PCbuild/get_externals.bat
index 3bb281904f6..799c46641f5 100644
--- a/PCbuild/get_externals.bat
+++ b/PCbuild/get_externals.bat
@@ -55,8 +55,8 @@ set libraries=%libraries%                                       bzip2-1.0.6
 if NOT "%IncludeLibffiSrc%"=="false" set libraries=%libraries%  libffi
 if NOT "%IncludeSSLSrc%"=="false" set libraries=%libraries%     openssl-1.1.1g
 set libraries=%libraries%                                       sqlite-3.33.0.0
-if NOT "%IncludeTkinterSrc%"=="false" set libraries=%libraries% tcl-core-8.6.9.0
-if NOT "%IncludeTkinterSrc%"=="false" set libraries=%libraries% tk-8.6.9.0
+if NOT "%IncludeTkinterSrc%"=="false" set libraries=%libraries% tcl-core-8.6.10.0
+if NOT "%IncludeTkinterSrc%"=="false" set libraries=%libraries% tk-8.6.10.0
 if NOT "%IncludeTkinterSrc%"=="false" set libraries=%libraries% tix-8.4.3.6
 set libraries=%libraries%                                       xz-5.2.2
 set libraries=%libraries%                                       zlib-1.2.11
@@ -78,7 +78,7 @@ echo.Fetching external binaries...
 set binaries=
 if NOT "%IncludeLibffi%"=="false"  set binaries=%binaries% libffi
 if NOT "%IncludeSSL%"=="false"     set binaries=%binaries% openssl-bin-1.1.1g
-if NOT "%IncludeTkinter%"=="false" set binaries=%binaries% tcltk-8.6.9.0
+if NOT "%IncludeTkinter%"=="false" set binaries=%binaries% tcltk-8.6.10.0
 if NOT "%IncludeSSLSrc%"=="false"  set binaries=%binaries% nasm-2.11.06
 
 for %%b in (%binaries%) do (
diff --git a/PCbuild/tcltk.props b/PCbuild/tcltk.props
index 7fcd3e1c618..fb61bee5147 100644
--- a/PCbuild/tcltk.props
+++ b/PCbuild/tcltk.props
@@ -4,7 +4,7 @@
   <PropertyGroup>
     <TclMajorVersion>8</TclMajorVersion>
     <TclMinorVersion>6</TclMinorVersion>
-    <TclPatchLevel>9</TclPatchLevel>
+    <TclPatchLevel>10</TclPatchLevel>
     <TclRevision>0</TclRevision>
     <TkMajorVersion>$(TclMajorVersion)</TkMajorVersion>
     <TkMinorVersion>$(TclMinorVersion)</TkMinorVersion>
@@ -36,8 +36,7 @@
     <BuildDirTop>Release</BuildDirTop>
     <BuildDirTop Condition="$(Configuration) == 'Debug'">Debug</BuildDirTop>
     <BuildDirTop Condition="$(TclMachine) != 'IX86'">$(BuildDirTop)_$(TclMachine)</BuildDirTop>
-    <BuildDirTop Condition="$(PlatformToolset) == 'v141'">$(BuildDirTop)_VC13</BuildDirTop>
-    <BuildDirTop Condition="$(PlatformToolset) == 'v140'">$(BuildDirTop)_VC13</BuildDirTop>
+    <BuildDirTop Condition="$(PlatformToolset.StartsWith('v14'))">$(BuildDirTop)_VC13</BuildDirTop>
     <BuildDirTop Condition="$(PlatformToolset) == 'v120'">$(BuildDirTop)_VC12</BuildDirTop>
     <BuildDirTop Condition="$(PlatformToolset) == 'v110'">$(BuildDirTop)_VC11</BuildDirTop>
     <BuildDirTop Condition="$(PlatformToolset) == 'v100'">$(BuildDirTop)_VC10</BuildDirTop>