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diff --git a/thirdparty/icu4c/common/lstmbe.h b/thirdparty/icu4c/common/lstmbe.h
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+++ b/thirdparty/icu4c/common/lstmbe.h
@@ -0,0 +1,87 @@
+// © 2021 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+
+#ifndef LSTMBE_H
+#define LSTMBE_H
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_BREAK_ITERATION
+
+#include "unicode/uniset.h"
+#include "unicode/ures.h"
+#include "unicode/utext.h"
+#include "unicode/utypes.h"
+
+#include "brkeng.h"
+#include "dictbe.h"
+#include "uvectr32.h"
+
+U_NAMESPACE_BEGIN
+
+class Vectorizer;
+struct LSTMData;
+
+/*******************************************************************
+ * LSTMBreakEngine
+ */
+
+/**
+ * <p>LSTMBreakEngine is a kind of DictionaryBreakEngine that uses a
+ * LSTM to determine language-specific breaks.</p>
+ *
+ * <p>After it is constructed a LSTMBreakEngine may be shared between
+ * threads without synchronization.</p>
+ */
+class LSTMBreakEngine : public DictionaryBreakEngine {
+public:
+    /**
+     * <p>Constructor.</p>
+     */
+    LSTMBreakEngine(const LSTMData* data, const UnicodeSet& set, UErrorCode &status);
+
+    /**
+     * <p>Virtual destructor.</p>
+     */
+    virtual ~LSTMBreakEngine();
+
+    virtual const UChar* name() const;
+
+protected:
+    /**
+     * <p>Divide up a range of known dictionary characters handled by this break engine.</p>
+     *
+     * @param text A UText representing the text
+     * @param rangeStart The start of the range of dictionary characters
+     * @param rangeEnd The end of the range of dictionary characters
+     * @param foundBreaks Output of C array of int32_t break positions, or 0
+     * @param status Information on any errors encountered.
+     * @return The number of breaks found
+     */
+     virtual int32_t divideUpDictionaryRange(UText *text,
+                                             int32_t rangeStart,
+                                             int32_t rangeEnd,
+                                             UVector32 &foundBreaks,
+                                             UErrorCode& status) const override;
+private:
+    const LSTMData* fData;
+    const Vectorizer* fVectorizer;
+};
+
+U_CAPI const LanguageBreakEngine* U_EXPORT2 CreateLSTMBreakEngine(
+    UScriptCode script, const LSTMData* data, UErrorCode& status);
+
+U_CAPI const LSTMData* U_EXPORT2 CreateLSTMData(
+    UResourceBundle* rb, UErrorCode& status);
+
+U_CAPI const LSTMData* U_EXPORT2 CreateLSTMDataForScript(
+    UScriptCode script, UErrorCode& status);
+
+U_CAPI void U_EXPORT2 DeleteLSTMData(const LSTMData* data);
+U_CAPI const UChar* U_EXPORT2 LSTMDataName(const LSTMData* data);
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_BREAK_ITERATION */
+
+#endif  /* LSTMBE_H */