diff --git a/contrib/install-windows-dependencies.ps1 b/contrib/install-windows-dependencies.ps1
--- a/contrib/install-windows-dependencies.ps1
+++ b/contrib/install-windows-dependencies.ps1
@@ -22,10 +22,10 @@
 $VC9_PYTHON_URL = "https://download.microsoft.com/download/7/9/6/796EF2E4-801B-4FC4-AB28-B59FBF6D907B/VCForPython27.msi"
 $VC9_PYTHON_SHA256 = "070474db76a2e625513a5835df4595df9324d820f9cc97eab2a596dcbc2f5cbf"
 
-$PYTHON27_x64_URL = "https://www.python.org/ftp/python/2.7.17/python-2.7.17.amd64.msi"
-$PYTHON27_x64_SHA256 = "3b934447e3620e51d2daf5b2f258c9b617bcc686ca2f777a49aa3b47893abf1b"
-$PYTHON27_X86_URL = "https://www.python.org/ftp/python/2.7.17/python-2.7.17.msi"
-$PYTHON27_X86_SHA256 = "a4e3a321517c6b0c2693d6f712a0d18c82600b3d0c759c299b3d14384a17f863"
+$PYTHON27_x64_URL = "https://www.python.org/ftp/python/2.7.18/python-2.7.18.amd64.msi"
+$PYTHON27_x64_SHA256 = "b74a3afa1e0bf2a6fc566a7b70d15c9bfabba3756fb077797d16fffa27800c05"
+$PYTHON27_X86_URL = "https://www.python.org/ftp/python/2.7.18/python-2.7.18.msi"
+$PYTHON27_X86_SHA256 = "d901802e90026e9bad76b8a81f8dd7e43c7d7e8269d9281c9e9df7a9c40480a9"
 
 $PYTHON35_x86_URL = "https://www.python.org/ftp/python/3.5.4/python-3.5.4.exe"
 $PYTHON35_x86_SHA256 = "F27C2D67FD9688E4970F3BFF799BB9D722A0D6C2C13B04848E1F7D620B524B0E"
@@ -37,15 +37,15 @@
 $PYTHON36_x64_URL = "https://www.python.org/ftp/python/3.6.8/python-3.6.8-amd64.exe"
 $PYTHON36_x64_SHA256 = "96088A58B7C43BC83B84E6B67F15E8706C614023DD64F9A5A14E81FF824ADADC"
 
-$PYTHON37_x86_URL = "https://www.python.org/ftp/python/3.7.5/python-3.7.5.exe"
-$PYTHON37_x86_SHA256 = "3c2ae8f72b48e6e0c2b482206e322bf5d0344ff91abc3b3c200cec9e275c7168"
-$PYTHON37_X64_URL = "https://www.python.org/ftp/python/3.7.5/python-3.7.5-amd64.exe"
-$PYTHON37_x64_SHA256 = "f3d60c127e7a92ed547efa3321bf70cd96b75c53bf4b903147015257c1314981"
+$PYTHON37_x86_URL = "https://www.python.org/ftp/python/3.7.7/python-3.7.7.exe"
+$PYTHON37_x86_SHA256 = "27fbffcd342d5055acc64050db4c35d0025661521e642b59c381dcba2e162c6a"
+$PYTHON37_X64_URL = "https://www.python.org/ftp/python/3.7.7/python-3.7.7-amd64.exe"
+$PYTHON37_x64_SHA256 = "1a0368663ceff999d865de955992b6ea3cb0c8cb15a1a296a8eb7df19cc59e69"
 
-$PYTHON38_x86_URL = "https://www.python.org/ftp/python/3.8.0/python-3.8.0.exe"
-$PYTHON38_x86_SHA256 = "b471908de5e10d8fb5c3351a5affb1172da7790c533e0c9ffbaeec9c11611b15"
-$PYTHON38_x64_URL = "https://www.python.org/ftp/python/3.8.0/python-3.8.0-amd64.exe"
-$PYTHON38_x64_SHA256 = "a9bbc6088a3e4c7112826e21bfee6277f7b6d93259f7c57176139231bb7071e4"
+$PYTHON38_x86_URL = "https://www.python.org/ftp/python/3.8.2/python-3.8.2.exe"
+$PYTHON38_x86_SHA256 = "03ac5754a69c9c11c08d1f4d694c14625a4d27348ad4dd2d1253e2547819db2c"
+$PYTHON38_x64_URL = "https://www.python.org/ftp/python/3.8.2/python-3.8.2-amd64.exe"
+$PYTHON38_x64_SHA256 = "8e400e3f32cdcb746e62e0db4d3ae4cba1f927141ebc4d0d5a4006b0daee8921"
 
 # PIP 19.2.3.
 $PIP_URL = "https://github.com/pypa/get-pip/raw/309a56c5fd94bd1134053a541cb4657a4e47e09d/get-pip.py"