diff --git a/aegisub/build/icu/icu.vcxproj b/aegisub/build/icu/icu.vcxproj
index 73832abb1..f90ea328b 100644
--- a/aegisub/build/icu/icu.vcxproj
+++ b/aegisub/build/icu/icu.vcxproj
@@ -84,10 +84,10 @@
     <!-- Generated with http://apps.icu-project.org/datacustom/ -->
     <!-- Includes Break Iterator and Collator data only -->
     <DownloadTgzFile
-      Url="http://www.aegisub.org/~plorkyeran/icudt51l.dat.tgz"
+      Url="http://www.aegisub.org/~plorkyeran/icudt52l.dat.tgz"
       Destination="$(MSBuildThisFileDirectory)..\..\..\deps\icu\source\data\in"
-      OutputFile="$(MSBuildThisFileDirectory)..\..\..\deps\icu\source\data\in\icudt51l.dat"
-      Hash="0885a647fdd48645a6bba48a7f8957131882db02"
+      OutputFile="$(MSBuildThisFileDirectory)..\..\..\deps\icu\source\data\in\icudt52l.dat"
+      Hash="b611a32e857ab4474e3c0118bd09b0958026fe1d"
       />
 
     <ExecShellScript
diff --git a/deps/icu b/deps/icu
index 55c280887..51ec27927 160000
--- a/deps/icu
+++ b/deps/icu
@@ -1 +1 @@
-Subproject commit 55c280887ce31011a147e5bbb56551e9d4b6641d
+Subproject commit 51ec279270332aba5e8723d81d1a780072ed518c