diff --git a/intl/icu-patches/bug-1706949-wasi-workaround.diff b/intl/icu-patches/bug-1706949-wasi-workaround.diff
index 668373b4d8f7..3ac1815b0c2c 100644
--- a/intl/icu-patches/bug-1706949-wasi-workaround.diff
+++ b/intl/icu-patches/bug-1706949-wasi-workaround.diff
@@ -3,7 +3,7 @@
 # WASI issue: https://github.com/WebAssembly/wasi-sdk/issues/180
 
 diff --git a/intl/icu/source/common/putilimp.h b/intl/icu/source/common/putilimp.h
-index d9c90cf4e756..410770aa7c0d 100644
+index 5b95a68..7097232 100644
 --- a/intl/icu/source/common/putilimp.h
 +++ b/intl/icu/source/common/putilimp.h
 @@ -103,6 +103,8 @@ typedef size_t uintptr_t;
@@ -34,7 +34,7 @@ index d9c90cf4e756..410770aa7c0d 100644
  #   define U_TZNAME tzname
  #endif
 diff --git a/intl/icu/source/common/umapfile.h b/intl/icu/source/common/umapfile.h
-index 92bd567a2a98..4ed1112bc6df 100644
+index 92bd567..4ed1112 100644
 --- a/intl/icu/source/common/umapfile.h
 +++ b/intl/icu/source/common/umapfile.h
 @@ -41,6 +41,8 @@ U_CFUNC void  uprv_unmapFile(UDataMemory *pData);
@@ -47,7 +47,7 @@ index 92bd567a2a98..4ed1112bc6df 100644
  #   define MAP_IMPLEMENTATION MAP_WIN32
  #elif U_HAVE_MMAP || U_PLATFORM == U_PF_OS390
 diff --git a/intl/icu/source/common/umutex.cpp b/intl/icu/source/common/umutex.cpp
-index ccbee9960a39..6c3452ca1bea 100644
+index ccbee99..6c3452c 100644
 --- a/intl/icu/source/common/umutex.cpp
 +++ b/intl/icu/source/common/umutex.cpp
 @@ -43,6 +43,7 @@ U_NAMESPACE_BEGIN
@@ -173,7 +173,7 @@ index ccbee9960a39..6c3452ca1bea 100644
  
  U_NAMESPACE_END
 diff --git a/intl/icu/source/common/umutex.h b/intl/icu/source/common/umutex.h
-index 2503aa4a2914..49c348444703 100644
+index 8d76b3f..c1a58db 100644
 --- a/intl/icu/source/common/umutex.h
 +++ b/intl/icu/source/common/umutex.h
 @@ -20,9 +20,12 @@
@@ -244,7 +244,7 @@ index 2503aa4a2914..49c348444703 100644
  
  /*************************************************************************************************
   *
-@@ -231,17 +261,25 @@ public:
+@@ -231,17 +261,25 @@ class U_COMMON_API UMutex {
  
      // requirements for C++ BasicLockable, allows UMutex to work with std::lock_guard
      void lock() {
@@ -271,7 +271,7 @@ index 2503aa4a2914..49c348444703 100644
  
      /** All initialized UMutexes are kept in a linked list, so that they can be found,
       * and the underlying std::mutex destructed, by u_cleanup().
-@@ -253,7 +291,9 @@ private:
+@@ -253,7 +291,9 @@ class U_COMMON_API UMutex {
       * Initial fast check is inline, in lock().  The returned value may never
       * be nullptr.
       */
@@ -282,7 +282,7 @@ index 2503aa4a2914..49c348444703 100644
  
  
 diff --git a/intl/icu/source/common/unifiedcache.cpp b/intl/icu/source/common/unifiedcache.cpp
-index f2dd91655958..c483ce143cd3 100644
+index 493ab79..a13eed8 100644
 --- a/intl/icu/source/common/unifiedcache.cpp
 +++ b/intl/icu/source/common/unifiedcache.cpp
 @@ -13,15 +13,19 @@
@@ -440,7 +440,7 @@ index f2dd91655958..c483ce143cd3 100644
  
  void UnifiedCache::_fetch(
 diff --git a/intl/icu/source/i18n/decContext.h b/intl/icu/source/i18n/decContext.h
-index e145777d1e7a..106704b6e76d 100644
+index 59ab65e..20f3526 100644
 --- a/intl/icu/source/i18n/decContext.h
 +++ b/intl/icu/source/i18n/decContext.h
 @@ -61,7 +61,9 @@
@@ -454,7 +454,7 @@ index e145777d1e7a..106704b6e76d 100644
    /* Extended flags setting -- set this to 0 to use only IEEE flags   */
    #if !defined(DECEXTFLAG)
 diff --git a/intl/icu/source/i18n/decimfmt.cpp b/intl/icu/source/i18n/decimfmt.cpp
-index daa1129a6ab1..c8f1eda62c30 100644
+index daa1129..c8f1eda 100644
 --- a/intl/icu/source/i18n/decimfmt.cpp
 +++ b/intl/icu/source/i18n/decimfmt.cpp
 @@ -480,8 +480,13 @@ DecimalFormat& DecimalFormat::operator=(const DecimalFormat& rhs) {
@@ -547,7 +547,7 @@ index daa1129a6ab1..c8f1eda62c30 100644
  
  void
 diff --git a/intl/icu/source/i18n/number_mapper.h b/intl/icu/source/i18n/number_mapper.h
-index d18b8b3c438c..e5b5e3fd6294 100644
+index 9ecd776..d094289 100644
 --- a/intl/icu/source/i18n/number_mapper.h
 +++ b/intl/icu/source/i18n/number_mapper.h
 @@ -7,7 +7,6 @@
@@ -569,7 +569,7 @@ index d18b8b3c438c..e5b5e3fd6294 100644
  U_NAMESPACE_BEGIN
  namespace number {
  namespace impl {
-@@ -183,10 +186,18 @@ struct DecimalFormatFields : public UMemory {
+@@ -193,10 +196,18 @@ struct DecimalFormatFields : public UMemory {
      LocalizedNumberFormatter formatter;
  
      /** The lazy-computed parser for .parse() */
@@ -589,10 +589,10 @@ index d18b8b3c438c..e5b5e3fd6294 100644
      /** Small object ownership warehouse for the formatter and parser */
      DecimalFormatWarehouse warehouse;
 diff --git a/intl/icu/source/i18n/numrange_fluent.cpp b/intl/icu/source/i18n/numrange_fluent.cpp
-index 33179026f8d2..ceec51431031 100644
+index f1060b3..66e12ee 100644
 --- a/intl/icu/source/i18n/numrange_fluent.cpp
 +++ b/intl/icu/source/i18n/numrange_fluent.cpp
-@@ -239,28 +239,48 @@ LocalizedNumberRangeFormatter::LocalizedNumberRangeFormatter(NFS<LNF>&& src) U_N
+@@ -240,29 +240,49 @@ LocalizedNumberRangeFormatter::LocalizedNumberRangeFormatter(NFS<LNF>&& src) U_N
          : NFS<LNF>(std::move(src)) {
      // Steal the compiled formatter
      LNF&& _src = static_cast<LNF&&>(src);
@@ -607,6 +607,7 @@ index 33179026f8d2..ceec51431031 100644
  }
  
  LocalizedNumberRangeFormatter& LocalizedNumberRangeFormatter::operator=(const LNF& other) {
+     if (this == &other) { return *this; }  // self-assignment: no-op
      NFS<LNF>::operator=(static_cast<const NFS<LNF>&>(other));
      // Do not steal; just clear
 +#ifndef __wasi__
@@ -641,7 +642,7 @@ index 33179026f8d2..ceec51431031 100644
  }
  
  LocalizedNumberRangeFormatter::LocalizedNumberRangeFormatter(const RangeMacroProps& macros, const Locale& locale) {
-@@ -344,7 +364,11 @@ LocalizedNumberRangeFormatter::getFormatter(UErrorCode& status) const {
+@@ -346,7 +366,11 @@ LocalizedNumberRangeFormatter::getFormatter(UErrorCode& status) const {
      }
  
      // First try to get the pre-computed formatter
@@ -653,7 +654,7 @@ index 33179026f8d2..ceec51431031 100644
      if (ptr != nullptr) {
          return ptr;
      }
-@@ -363,6 +387,7 @@ LocalizedNumberRangeFormatter::getFormatter(UErrorCode& status) const {
+@@ -365,6 +389,7 @@ LocalizedNumberRangeFormatter::getFormatter(UErrorCode& status) const {
      // it is set to what is actually stored in the atomic
      // if another thread beat us to computing the formatter object.
      auto* nonConstThis = const_cast<LocalizedNumberRangeFormatter*>(this);
@@ -661,7 +662,7 @@ index 33179026f8d2..ceec51431031 100644
      if (!nonConstThis->fAtomicFormatter.compare_exchange_strong(ptr, temp)) {
          // Another thread beat us to computing the formatter
          delete temp;
-@@ -371,6 +396,10 @@ LocalizedNumberRangeFormatter::getFormatter(UErrorCode& status) const {
+@@ -373,6 +398,10 @@ LocalizedNumberRangeFormatter::getFormatter(UErrorCode& status) const {
          // Our copy of the formatter got stored in the atomic
          return temp;
      }
@@ -673,7 +674,7 @@ index 33179026f8d2..ceec51431031 100644
  }
  
 diff --git a/intl/icu/source/i18n/unicode/numberrangeformatter.h b/intl/icu/source/i18n/unicode/numberrangeformatter.h
-index 4d436a769453..5adb09285797 100644
+index b9a4600..0ba2fa0 100644
 --- a/intl/icu/source/i18n/unicode/numberrangeformatter.h
 +++ b/intl/icu/source/i18n/unicode/numberrangeformatter.h
 @@ -10,7 +10,6 @@
@@ -695,7 +696,7 @@ index 4d436a769453..5adb09285797 100644
  /**
   * \file
   * \brief C++ API: Library for localized formatting of number, currency, and unit ranges.
-@@ -194,7 +197,9 @@ class NumberRangeFormatterImpl;
+@@ -77,7 +80,9 @@ struct UFormattedNumberRangeImpl;
  } // namespace icu::number
  U_NAMESPACE_END
  
@@ -705,7 +706,7 @@ index 4d436a769453..5adb09285797 100644
  
  U_NAMESPACE_BEGIN
  namespace number {  // icu::number
-@@ -663,7 +668,11 @@ class U_I18N_API LocalizedNumberRangeFormatter
+@@ -546,7 +551,11 @@ class U_I18N_API LocalizedNumberRangeFormatter
      ~LocalizedNumberRangeFormatter();
  
    private:
diff --git a/intl/icu-patches/bug-1714933-1-locale-unicode-keywords.diff b/intl/icu-patches/bug-1714933-1-locale-unicode-keywords.diff
new file mode 100644
index 000000000000..40630b707be7
--- /dev/null
+++ b/intl/icu-patches/bug-1714933-1-locale-unicode-keywords.diff
@@ -0,0 +1,29 @@
+# https://unicode-org.atlassian.net/browse/ICU-21539
+#
+# https://github.com/unicode-org/icu/commit/45b893c1f9af9e541b8812c2073471e134aaf773.diff
+
+diff --git a/intl/icu/source/common/locid.cpp b/intl/icu/source/common/locid.cpp
+index 4fec17d14fd..02cd82a7b8e 100644
+--- a/intl/icu/source/common/locid.cpp
++++ b/intl/icu/source/common/locid.cpp
+@@ -2515,16 +2515,16 @@ class UnicodeKeywordEnumeration : public KeywordEnumeration {
+ 
+     virtual const char* next(int32_t* resultLength, UErrorCode& status) {
+         const char* legacy_key = KeywordEnumeration::next(nullptr, status);
+-        if (U_SUCCESS(status) && legacy_key != nullptr) {
++        while (U_SUCCESS(status) && legacy_key != nullptr) {
+             const char* key = uloc_toUnicodeLocaleKey(legacy_key);
+-            if (key == nullptr) {
+-                status = U_ILLEGAL_ARGUMENT_ERROR;
+-            } else {
++            if (key != nullptr) {
+                 if (resultLength != nullptr) {
+                     *resultLength = static_cast<int32_t>(uprv_strlen(key));
+                 }
+                 return key;
+             }
++            // Not a Unicode keyword, could be a t, x or other, continue to look at the next one.
++            legacy_key = KeywordEnumeration::next(nullptr, status);
+         }
+         if (resultLength != nullptr) *resultLength = 0;
+         return nullptr;
diff --git a/intl/icu-patches/bug-1714933-2-locale-basename-memory-leak.diff b/intl/icu-patches/bug-1714933-2-locale-basename-memory-leak.diff
new file mode 100644
index 000000000000..c6f14fa46e84
--- /dev/null
+++ b/intl/icu-patches/bug-1714933-2-locale-basename-memory-leak.diff
@@ -0,0 +1,39 @@
+# https://unicode-org.atlassian.net/browse/ICU-21587
+#
+# https://github.com/unicode-org/icu/commit/2dc5bea9061b4fb05cd03e21b775dd944a0eb81d.diff
+
+diff --git a/intl/icu/source/common/locid.cpp b/intl/icu/source/common/locid.cpp
+index 02cd82a7b8e..3c6e5b06690 100644
+--- a/intl/icu/source/common/locid.cpp
++++ b/intl/icu/source/common/locid.cpp
+@@ -469,14 +469,18 @@ Locale& Locale::operator=(Locale&& other) U_NOEXCEPT {
+     if ((baseName != fullName) && (baseName != fullNameBuffer)) uprv_free(baseName);
+     if (fullName != fullNameBuffer) uprv_free(fullName);
+ 
+-    if (other.fullName == other.fullNameBuffer) {
++    if (other.fullName == other.fullNameBuffer || other.baseName == other.fullNameBuffer) {
+         uprv_strcpy(fullNameBuffer, other.fullNameBuffer);
++    }
++    if (other.fullName == other.fullNameBuffer) {
+         fullName = fullNameBuffer;
+     } else {
+         fullName = other.fullName;
+     }
+ 
+-    if (other.baseName == other.fullName) {
++    if (other.baseName == other.fullNameBuffer) {
++        baseName = fullNameBuffer;
++    } else if (other.baseName == other.fullName) {
+         baseName = fullName;
+     } else {
+         baseName = other.baseName;
+@@ -2681,6 +2685,9 @@ Locale::setKeywordValue(const char* keywordName, const char* keywordValue, UErro
+         if (fullName != fullNameBuffer) {
+             // if full Name is already on the heap, need to free it.
+             uprv_free(fullName);
++            if (baseName == fullName) {
++                baseName = newFullName; // baseName should not point to freed memory.
++            }
+         }
+         fullName = newFullName;
+         status = U_ZERO_ERROR;
diff --git a/intl/icu-patches/bug-1714933-3-locale-nullptr-deref.diff b/intl/icu-patches/bug-1714933-3-locale-nullptr-deref.diff
new file mode 100644
index 000000000000..14aa7e04d50b
--- /dev/null
+++ b/intl/icu-patches/bug-1714933-3-locale-nullptr-deref.diff
@@ -0,0 +1,29 @@
+# https://unicode-org.atlassian.net/browse/ICU-21597
+#
+# https://github.com/unicode-org/icu/commit/b13be666cd354c4ff177906d779273d7cfc155c0.diff
+
+diff --git a/intl/icu/source/common/locid.cpp b/intl/icu/source/common/locid.cpp
+index 3c6e5b06690..4b7d21ee13d 100644
+--- a/intl/icu/source/common/locid.cpp
++++ b/intl/icu/source/common/locid.cpp
+@@ -1571,6 +1571,7 @@ AliasReplacer::replaceTransformedExtensions(
+             const char* tvalue = uprv_strchr(tkey, '-');
+             if (tvalue == nullptr) {
+                 status = U_ILLEGAL_ARGUMENT_ERROR;
++                return false;
+             }
+             const char* nextTKey = ultag_getTKeyStart(tvalue);
+             if (nextTKey != nullptr) {
+@@ -1591,8 +1592,11 @@ AliasReplacer::replaceTransformedExtensions(
+              }
+              const char* tfield = (const char*) tfields.elementAt(i);
+              const char* tvalue = uprv_strchr(tfield, '-');
++             if (tvalue == nullptr) {
++                 status = U_ILLEGAL_ARGUMENT_ERROR;
++                 return false;
++             }
+              // Split the "tkey-tvalue" pair string so that we can canonicalize the tvalue.
+-             U_ASSERT(tvalue != nullptr);
+              *((char*)tvalue++) = '\0'; // NULL terminate tkey
+              output.append(tfield, status).append('-', status);
+              const char* bcpTValue = ulocimp_toBcpType(tfield, tvalue, nullptr, nullptr);
diff --git a/intl/update-icu.sh b/intl/update-icu.sh
index 9c6f1c192575..93c82ba4f38c 100755
--- a/intl/update-icu.sh
+++ b/intl/update-icu.sh
@@ -58,6 +58,9 @@ for patch in \
  bug-1636984-display-name-fractional-seconds.diff \
  bug-1636984-append-item-dayperiod-fractional-seconds.diff \
  bug-1706949-wasi-workaround.diff \
+ bug-1714933-1-locale-unicode-keywords.diff \
+ bug-1714933-2-locale-basename-memory-leak.diff \
+ bug-1714933-3-locale-nullptr-deref.diff \
 ; do
   echo "Applying local patch $patch"
   patch -d ${icu_dir}/../../ -p1 --no-backup-if-mismatch < ${icu_dir}/../icu-patches/$patch