diff --git a/third_party/icu/data/BUILD.bazel b/third_party/icu/data/BUILD.bazel
index 7db21566e4e..6ff47a8d5fc 100644
--- a/third_party/icu/data/BUILD.bazel
+++ b/third_party/icu/data/BUILD.bazel
@@ -15,16 +15,13 @@ exports_files(["LICENSE"])
 #
 # First, download, build, and install ICU. This installs tools such as makeconv.
 # Then, run the following from your icu4c/source directory:
-#   $ cd data/mappings
-#   $ rm *.cnv  # there shouldn't be any .cnv files here to begin with
-#   $ grep \.ucm ucmcore.mk | \
-#     sed 's/\(UCM_SOURCE_CORE=\)\?\([^ ]\+\.ucm\)\\\?/\2/g' | \
-#     tr '\n' ' ' | xargs makeconv
-#   $ ls *.cnv > filelist.lst
-#   $ pkgdata -m common -p ucmcore filelist.lst
-#   $ genccode -f custom_conversion_data ucmcore.dat
-# This creates custom_conversion_data.c. You will need to change the target
-# :conversion_data to depend on your custom source instead of :conversion_data.c
+#   $ cp [path to filters.json] .
+#   $ ICU_DATA_FILTER_FILE=filters.json ./runConfigureICU Linux
+#   $ make clean && make
+#   $ cd data/out/tmp
+#   $ genccode icudt64l.dat
+#   $ echo 'U_CAPI const void * U_EXPORT2 uprv_getICUData_conversion() { return icudt64l_dat.bytes; }' >> icudt64l_dat.c
+# This creates icudt64l_dat.c, which you can move, rename, gzip, then split.
 filegroup(
     name = "conversion_files",
     srcs = glob(["icu_conversion_data.c.gz.*"]),
diff --git a/third_party/icu/data/icu_conversion_data.c.gz.aa b/third_party/icu/data/icu_conversion_data.c.gz.aa
index b68a2c6516f..543b6615708 100644
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diff --git a/third_party/icu/data/icu_conversion_data.c.gz.ab b/third_party/icu/data/icu_conversion_data.c.gz.ab
index d60aa92d675..d8cd5108e62 100644
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diff --git a/third_party/icu/data/icu_conversion_data.c.gz.ac b/third_party/icu/data/icu_conversion_data.c.gz.ac
index de9b69ff947..bde21d16f57 100644
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diff --git a/third_party/icu/data/icu_conversion_data.c.gz.ad b/third_party/icu/data/icu_conversion_data.c.gz.ad
index d5abb06b8ca..f476988a0b2 100644
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diff --git a/third_party/icu/data/icu_conversion_data.c.gz.ae b/third_party/icu/data/icu_conversion_data.c.gz.ae
index 0e54fdb9eaf..3388b38c1a2 100644
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diff --git a/third_party/icu/data/icu_conversion_data.c.gz.af b/third_party/icu/data/icu_conversion_data.c.gz.af
index cfbeb165ad3..344e3925f39 100644
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diff --git a/third_party/icu/data/icu_conversion_data.c.gz.ag b/third_party/icu/data/icu_conversion_data.c.gz.ag
index bde20b6da62..249ffddde77 100644
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diff --git a/third_party/icu/data/icu_conversion_data.c.gz.ah b/third_party/icu/data/icu_conversion_data.c.gz.ah
index ae31dffbe2a..8893be20419 100644
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diff --git a/third_party/icu/data/icu_conversion_data.c.gz.ai b/third_party/icu/data/icu_conversion_data.c.gz.ai
index 981b869561a..e6251e3a11c 100644
Binary files a/third_party/icu/data/icu_conversion_data.c.gz.ai and b/third_party/icu/data/icu_conversion_data.c.gz.ai differ
diff --git a/third_party/icu/data/icu_conversion_data.c.gz.aj b/third_party/icu/data/icu_conversion_data.c.gz.aj
index 1ae6bce382a..3e1dc684c93 100644
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diff --git a/third_party/icu/udata.patch b/third_party/icu/udata.patch
index 4c975439e21..db6a06d26ef 100644
--- a/third_party/icu/udata.patch
+++ b/third_party/icu/udata.patch
@@ -12,10 +12,9 @@
  /**
   * \def U_DEBUG
   * Determines whether to include debugging code.
-
 --- a/icu4c/source/common/udata.cpp
 +++ b/icu4c/source/common/udata.cpp
-@@ -18,15 +18,15 @@
+@@ -18,11 +18,10 @@
  
  #include "unicode/utypes.h"  /* U_PLATFORM etc. */
  
@@ -31,12 +30,7 @@
  #endif
  
  #include "unicode/putil.h"
- #include "unicode/udata.h"
-+#include "unicode/umachine.h"
- #include "unicode/uversion.h"
- #include "charstr.h"
- #include "cmemory.h"
-@@ -641,10 +641,11 @@
+@@ -649,10 +648,9 @@
   * partial-data-library access functions where each returns a pointer
   * to its data package, if it is linked in.
   */
@@ -44,22 +38,19 @@
 -extern const void *uprv_getICUData_collation(void) ATTRIBUTE_WEAK;
 -extern const void *uprv_getICUData_conversion(void) ATTRIBUTE_WEAK;
 -*/
-+
-+//extern "C" const void *uprv_getICUData_collation(void);
 +U_CDECL_BEGIN
 +const void *uprv_getICUData_conversion(void) ATTRIBUTE_WEAK;
 +U_CDECL_END
  
  /*----------------------------------------------------------------------*
   *                                                                      *
-@@ -702,10 +703,11 @@
+@@ -710,10 +708,11 @@
          if (uprv_getICUData_collation) {
              setCommonICUDataPointer(uprv_getICUData_collation(), FALSE, pErrorCode);
          }
 +        */
          if (uprv_getICUData_conversion) {
--            setCommonICUDataPointer(uprv_getICUData_conversion(), FALSE, pErrorCode);
-+          setCommonICUDataPointer(uprv_getICUData_conversion(), FALSE, pErrorCode);
+             setCommonICUDataPointer(uprv_getICUData_conversion(), FALSE, pErrorCode);
          }
 -        */
 +
diff --git a/third_party/icu/workspace.bzl b/third_party/icu/workspace.bzl
index ddd309a3ee6..a2131a5005e 100644
--- a/third_party/icu/workspace.bzl
+++ b/third_party/icu/workspace.bzl
@@ -10,11 +10,11 @@ def clean_dep(dep):
 def repo():
     third_party_http_archive(
         name = "icu",
-        strip_prefix = "icu-release-62-1",
-        sha256 = "e15ffd84606323cbad5515bf9ecdf8061cc3bf80fb883b9e6aa162e485aa9761",
+        strip_prefix = "icu-release-64-2",
+        sha256 = "dfc62618aa4bd3ca14a3df548cd65fe393155edd213e49c39f3a30ccd618fc27",
         urls = [
-            "https://storage.googleapis.com/mirror.tensorflow.org/github.com/unicode-org/icu/archive/release-62-1.tar.gz",
-            "https://github.com/unicode-org/icu/archive/release-62-1.tar.gz",
+            "https://storage.googleapis.com/mirror.tensorflow.org/github.com/unicode-org/icu/archive/release-64-2.zip",
+            "https://github.com/unicode-org/icu/archive/release-64-2.zip",
         ],
         build_file = "//third_party/icu:BUILD.bazel",
         system_build_file = "//third_party/icu:BUILD.system",