diff --git a/documentation-website/Writerside/topics/Breaking-Changes.md b/documentation-website/Writerside/topics/Breaking-Changes.md
index 8845661361..b7464c4773 100644
--- a/documentation-website/Writerside/topics/Breaking-Changes.md
+++ b/documentation-website/Writerside/topics/Breaking-Changes.md
@@ -3,6 +3,9 @@
 ## 0.56.0
 * If the `distinct` parameter of `groupConcat()` is set to `true`, when using Oracle or SQL Server, this will now fail early with an
   `UnsupportedByDialectException`. Previously, the setting would be ignored and SQL function generation would not include a `DISTINCT` clause.
+* In Oracle and H2 Oracle, the `ubyte()` column now maps to data type `NUMBER(3)` instead of `NUMBER(4)`.
+* In Oracle and H2 Oracle, the `ushort()` column now maps to data type `NUMBER(5)` instead of `NUMBER(6)`.
+* In Oracle and H2 Oracle, the `uinteger()` column now maps to data type `NUMBER(10)` instead of `NUMBER(13)`.
 
 ## 0.55.0
 * The `DeleteStatement` property `table` is now deprecated in favor of `targetsSet`, which holds a `ColumnSet` that may be a `Table` or `Join`.
diff --git a/exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/vendors/OracleDialect.kt b/exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/vendors/OracleDialect.kt
index 551ecf8698..f40c188c77 100644
--- a/exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/vendors/OracleDialect.kt
+++ b/exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/vendors/OracleDialect.kt
@@ -18,17 +18,17 @@ internal object OracleDataTypeProvider : DataTypeProvider() {
     } else {
         "NUMBER(3)"
     }
-    override fun ubyteType(): String = "NUMBER(4)"
+    override fun ubyteType(): String = "NUMBER(3)"
     override fun shortType(): String = if (currentDialect.h2Mode == H2Dialect.H2CompatibilityMode.Oracle) {
         "SMALLINT"
     } else {
         "NUMBER(5)"
     }
-    override fun ushortType(): String = "NUMBER(6)"
+    override fun ushortType(): String = "NUMBER(5)"
     override fun integerType(): String = "NUMBER(12)"
     override fun integerAutoincType(): String = "NUMBER(12)"
-    override fun uintegerType(): String = "NUMBER(13)"
-    override fun uintegerAutoincType(): String = "NUMBER(13)"
+    override fun uintegerType(): String = "NUMBER(10)"
+    override fun uintegerAutoincType(): String = "NUMBER(10)"
     override fun longType(): String = "NUMBER(19)"
     override fun longAutoincType(): String = "NUMBER(19)"
     override fun ulongType(): String = "NUMBER(20)"