diff --git a/include/liblouis b/include/liblouis
index cc834a39b28..1362d1b54b0 160000
--- a/include/liblouis
+++ b/include/liblouis
@@ -1 +1 @@
-Subproject commit cc834a39b28b22242d8546417afa1fda5a39440b
+Subproject commit 1362d1b54b01f6637c25442226641a7c4c708d73
diff --git a/nvdaHelper/liblouis/sconscript b/nvdaHelper/liblouis/sconscript
index 21c81437efd..95890de960c 100644
--- a/nvdaHelper/liblouis/sconscript
+++ b/nvdaHelper/liblouis/sconscript
@@ -41,9 +41,6 @@ env = env.Clone()
 if 'analyze' in env['nvdaHelperDebugFlags']:
 	env.Append(CCFLAGS='/analyze-')
 
-# Ignore some warnings as the code is not ours
-env.Replace(CCFLAGS='/W2')
-
 env.Append(CPPDEFINES=[
 	# The Visual C++ C Runtime deprecates several standard library functions in
 	# preference for _s variants that are specific to Visual C++. This removes
diff --git a/readme.md b/readme.md
index 22d9ff9242b..f0e3a644d10 100644
--- a/readme.md
+++ b/readme.md
@@ -67,7 +67,7 @@ For reference, the following dependencies are included in Git submodules:
 * [Sonic](https://github.com/waywardgeek/sonic), commit 4f8c1d11
 * [IAccessible2](http://www.linuxfoundation.org/collaborate/workgroups/accessibility/iaccessible2), commit 21bbb176
 * [ConfigObj](https://github.com/DiffSK/configobj), commit 5b5de48
-* [liblouis](http://www.liblouis.org/), version 3.10.0
+* [liblouis](http://www.liblouis.org/), version 3.9.0
 * [Unicode Common Locale Data Repository (CLDR)](http://cldr.unicode.org/) Emoji Annotations, version 35.0
 * NVDA images and sounds
 * System dlls not present on many systems: mfc90.dll, msvcp90.dll, msvcr90.dll, Microsoft.VC90.CRT.manifest