diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5fd1ce129..093184fdf 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,13 @@
 
 # 🚀Changelog
 
+-------------------------------------------------------------------------------------------------------------
+# 5.8.39(2025-05-13)
+
+### 🐣新特性
+### 🐞Bug修复
+* 【core   】      修复`NumberUtil`isNumber方法以L结尾没有小数点判断问题（issue#3938@Github）
+
 -------------------------------------------------------------------------------------------------------------
 # 5.8.38(2025-05-13)
 
diff --git a/hutool-core/src/main/java/cn/hutool/core/util/NumberUtil.java b/hutool-core/src/main/java/cn/hutool/core/util/NumberUtil.java
index 789493029..179aa1056 100755
--- a/hutool-core/src/main/java/cn/hutool/core/util/NumberUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/util/NumberUtil.java
@@ -1266,7 +1266,7 @@ public class NumberUtil {
 			}
 			if (chars[i] == 'l' || chars[i] == 'L') {
 				// not allowing L with an exponent
-				return foundDigit && !hasExp;
+				return foundDigit && !hasExp && !hasDecPoint;
 			}
 			// last character is illegal
 			return false;