diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.cpp b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.cpp
index 6bb90fc..5d0c79c 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.cpp
@@ -43,8 +43,13 @@
                 dictBuf, mFlags, MAX_WORD_LENGTH, &pos);
     }
     if (isTerminal()) {
+        mProbabilityFieldPos = pos;
+        if (usesAdditionalBuffer) {
+            mProbabilityFieldPos += mBuffer->getOriginalBufferSize();
+        }
         mProbability = PatriciaTrieReadingUtils::readProbabilityAndAdvancePosition(dictBuf, &pos);
     } else {
+        mProbabilityFieldPos = NOT_A_DICT_POS;
         mProbability = NOT_A_PROBABILITY;
     }
     mChildrenPos = DynamicPatriciaTrieReadingUtils::readChildrenPositionAndAdvancePosition(
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.h b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.h
index acc68b3..08e1cb4 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.h
@@ -40,7 +40,8 @@
             const DictionaryShortcutsStructurePolicy *const shortcutsPolicy)
             : mBuffer(buffer), mBigramsPolicy(bigramsPolicy),
               mShortcutsPolicy(shortcutsPolicy), mNodePos(NOT_A_VALID_WORD_POS), mFlags(0),
-              mParentPos(NOT_A_DICT_POS),  mCodePointCount(0), mProbability(NOT_A_PROBABILITY),
+              mParentPos(NOT_A_DICT_POS),  mCodePointCount(0),
+              mProbabilityFieldPos(NOT_A_DICT_POS), mProbability(NOT_A_PROBABILITY),
               mChildrenPos(NOT_A_DICT_POS), mShortcutPos(NOT_A_DICT_POS),
               mBigramPos(NOT_A_DICT_POS), mSiblingPos(NOT_A_VALID_WORD_POS) {}
 
@@ -95,6 +96,10 @@
     }
 
     // Probability
+    AK_FORCE_INLINE int getProbabilityFieldPos() const {
+        return mProbabilityFieldPos;
+    }
+
     AK_FORCE_INLINE int getProbability() const {
         return mProbability;
     }
@@ -129,6 +134,7 @@
     DynamicPatriciaTrieReadingUtils::NodeFlags mFlags;
     int mParentPos;
     uint8_t mCodePointCount;
+    int mProbabilityFieldPos;
     int mProbability;
     int mChildrenPos;
     int mShortcutPos;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.cpp b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.cpp
index 03dc576..2f0bc85 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.cpp
@@ -26,6 +26,9 @@
 
 namespace latinime {
 
+// TODO: Enable dynamic update and remove this flag.
+const bool DynamicPatriciaTrieWritingHelper::ENABLE_DYNAMIC_UPDATE = false;
+
 bool DynamicPatriciaTrieWritingHelper::addUnigramWord(
         DynamicPatriciaTrieReadingHelper *const readingHelper,
         const int *const wordCodePoints, const int codePointCount, const int probability) {
@@ -56,12 +59,12 @@
         }
         // All characters are matched.
         if (codePointCount == readingHelper->getTotalCodePointCount()) {
-            if (nodeReader->isTerminal()) {
-                // TODO: Update probability.
+            if (ENABLE_DYNAMIC_UPDATE) {
+                setPtNodeProbability(nodeReader, probability,
+                        readingHelper->getMergedNodeCodePoints());
             } else {
-                // TODO: Make it terminal and update probability.
+                return false;
             }
-            return false;
         }
         if (!nodeReader->hasChildren()) {
             // TODO: Create children node array and add new node as a child.
@@ -76,12 +79,14 @@
         return false;
     }
     int pos = readingHelper->getPosOfLastForwardLinkField();
-    // TODO: Remove.
-    return false;
-    return createAndInsertNodeIntoPtNodeArray(parentPos,
-            wordCodePoints + readingHelper->getPrevTotalCodePointCount(),
-            codePointCount - readingHelper->getPrevTotalCodePointCount(),
-            probability, &pos);
+    if (ENABLE_DYNAMIC_UPDATE) {
+        return createAndInsertNodeIntoPtNodeArray(parentPos,
+                wordCodePoints + readingHelper->getPrevTotalCodePointCount(),
+                codePointCount - readingHelper->getPrevTotalCodePointCount(),
+                probability, &pos);
+    } else {
+        return false;
+    }
 }
 
 bool DynamicPatriciaTrieWritingHelper::addBigramWords(const int word0Pos, const int word1Pos,
@@ -214,4 +219,30 @@
     return true;
 }
 
+bool DynamicPatriciaTrieWritingHelper::setPtNodeProbability(
+        const DynamicPatriciaTrieNodeReader *const originalPtNode, const int probability,
+        const int *const codePoints) {
+    if (originalPtNode->isTerminal()) {
+        // Overwrites the probability.
+        int probabilityFieldPos = originalPtNode->getProbabilityFieldPos();
+        if (!DynamicPatriciaTrieWritingUtils::writeProbabilityAndAdvancePosition(mBuffer,
+                probability, &probabilityFieldPos)) {
+            return false;
+        }
+    } else {
+        // Make the node terminal and write the probability.
+        int movedPos = mBuffer->getTailPosition();
+        if (!markNodeAsMovedAndSetPosition(originalPtNode, movedPos)) {
+            return false;
+        }
+        if (!writeNodeToBuffer(originalPtNode->isBlacklisted(), originalPtNode->isNotAWord(),
+                originalPtNode->getParentPos(), codePoints, originalPtNode->getCodePointCount(),
+                probability, originalPtNode->getChildrenPos(), originalPtNode->getBigramsPos(),
+                originalPtNode->getShortcutPos(), &movedPos)) {
+            return false;
+        }
+    }
+    return true;
+}
+
 } // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.h b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.h
index 524f361..7803ce8 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.h
@@ -49,6 +49,7 @@
  private:
     DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicPatriciaTrieWritingHelper);
 
+    static const bool ENABLE_DYNAMIC_UPDATE;
     BufferWithExtendableBuffer *const mBuffer;
     DynamicBigramListPolicy *const mBigramPolicy;
     DynamicShortcutListPolicy *const mShortcutPolicy;
@@ -63,6 +64,9 @@
 
     bool createAndInsertNodeIntoPtNodeArray(const int parentPos, const int *const nodeCodePoints,
             const int nodeCodePointCount, const int probability, int *const forwardLinkFieldPos);
+
+    bool setPtNodeProbability(const DynamicPatriciaTrieNodeReader *const originalNode,
+            const int probability, const int *const codePoints);
 };
 } // namespace latinime
 #endif /* LATINIME_DYNAMIC_PATRICIA_TRIE_WRITING_HELPER_H */