diff --git a/schema/bom-1.5.xsd b/schema/bom-1.5.xsd
index 0651bcdd..d7a17437 100644
--- a/schema/bom-1.5.xsd
+++ b/schema/bom-1.5.xsd
@@ -22,7 +22,7 @@ limitations under the License.
            targetNamespace="http://cyclonedx.org/schema/bom/1.5"
            vc:minVersion="1.0"
            vc:maxVersion="1.1"
-           version="1.5.0">
+           version="1.5.1">
 
     <xs:import namespace="http://cyclonedx.org/schema/spdx" schemaLocation="http://cyclonedx.org/schema/spdx"/>
 
@@ -2885,7 +2885,7 @@ limitations under the License.
                             </xs:annotation>
                             <xs:complexType>
                                 <xs:sequence>
-                                    <xs:element name="user" type="xs:string" minOccurs="0" maxOccurs="1" />
+                                    <xs:element name="user" type="xs:string" minOccurs="0" maxOccurs="unbounded" />
                                 </xs:sequence>
                             </xs:complexType>
                         </xs:element>
@@ -2897,7 +2897,7 @@ limitations under the License.
                             </xs:annotation>
                             <xs:complexType>
                                 <xs:sequence>
-                                    <xs:element name="useCase" type="xs:string" minOccurs="0" maxOccurs="1" />
+                                    <xs:element name="useCase" type="xs:string" minOccurs="0" maxOccurs="unbounded" />
                                 </xs:sequence>
                             </xs:complexType>
                         </xs:element>
@@ -2911,7 +2911,7 @@ limitations under the License.
                             </xs:annotation>
                             <xs:complexType>
                                 <xs:sequence>
-                                    <xs:element name="technicalLimitation" type="xs:string" minOccurs="0" maxOccurs="1" />
+                                    <xs:element name="technicalLimitation" type="xs:string" minOccurs="0" maxOccurs="unbounded" />
                                 </xs:sequence>
                             </xs:complexType>
                         </xs:element>
@@ -2923,7 +2923,7 @@ limitations under the License.
                             </xs:annotation>
                             <xs:complexType>
                                 <xs:sequence>
-                                    <xs:element name="performanceTradeoff" type="xs:string" minOccurs="0" maxOccurs="1" />
+                                    <xs:element name="performanceTradeoff" type="xs:string" minOccurs="0" maxOccurs="unbounded" />
                                 </xs:sequence>
                             </xs:complexType>
                         </xs:element>
diff --git a/schema/bom-1.6.xsd b/schema/bom-1.6.xsd
index 847c5261..7d162ee1 100644
--- a/schema/bom-1.6.xsd
+++ b/schema/bom-1.6.xsd
@@ -22,7 +22,7 @@ limitations under the License.
            targetNamespace="http://cyclonedx.org/schema/bom/1.6"
            vc:minVersion="1.0"
            vc:maxVersion="1.1"
-           version="1.6.1">
+           version="1.6.2">
 
     <xs:import namespace="http://cyclonedx.org/schema/spdx" schemaLocation="http://cyclonedx.org/schema/spdx"/>
 
@@ -3256,7 +3256,7 @@ limitations under the License.
                             </xs:annotation>
                             <xs:complexType>
                                 <xs:sequence>
-                                    <xs:element name="user" type="xs:string" minOccurs="0" maxOccurs="1" />
+                                    <xs:element name="user" type="xs:string" minOccurs="0" maxOccurs="unbounded" />
                                 </xs:sequence>
                             </xs:complexType>
                         </xs:element>
@@ -3268,7 +3268,7 @@ limitations under the License.
                             </xs:annotation>
                             <xs:complexType>
                                 <xs:sequence>
-                                    <xs:element name="useCase" type="xs:string" minOccurs="0" maxOccurs="1" />
+                                    <xs:element name="useCase" type="xs:string" minOccurs="0" maxOccurs="unbounded" />
                                 </xs:sequence>
                             </xs:complexType>
                         </xs:element>
@@ -3282,7 +3282,7 @@ limitations under the License.
                             </xs:annotation>
                             <xs:complexType>
                                 <xs:sequence>
-                                    <xs:element name="technicalLimitation" type="xs:string" minOccurs="0" maxOccurs="1" />
+                                    <xs:element name="technicalLimitation" type="xs:string" minOccurs="0" maxOccurs="unbounded" />
                                 </xs:sequence>
                             </xs:complexType>
                         </xs:element>
@@ -3294,7 +3294,7 @@ limitations under the License.
                             </xs:annotation>
                             <xs:complexType>
                                 <xs:sequence>
-                                    <xs:element name="performanceTradeoff" type="xs:string" minOccurs="0" maxOccurs="1" />
+                                    <xs:element name="performanceTradeoff" type="xs:string" minOccurs="0" maxOccurs="unbounded" />
                                 </xs:sequence>
                             </xs:complexType>
                         </xs:element>
diff --git a/schema/bom-1.7.xsd b/schema/bom-1.7.xsd
index deba3de2..b040c9a4 100644
--- a/schema/bom-1.7.xsd
+++ b/schema/bom-1.7.xsd
@@ -22,7 +22,7 @@ limitations under the License.
            targetNamespace="http://cyclonedx.org/schema/bom/1.7"
            vc:minVersion="1.0"
            vc:maxVersion="1.1"
-           version="1.7.0">
+           version="1.7.1">
 
     <xs:import namespace="http://cyclonedx.org/schema/spdx" schemaLocation="http://cyclonedx.org/schema/spdx"/>
 
@@ -3499,7 +3499,7 @@ limitations under the License.
                             </xs:annotation>
                             <xs:complexType>
                                 <xs:sequence>
-                                    <xs:element name="user" type="xs:string" minOccurs="0" maxOccurs="1" />
+                                    <xs:element name="user" type="xs:string" minOccurs="0" maxOccurs="unbounded" />
                                 </xs:sequence>
                             </xs:complexType>
                         </xs:element>
@@ -3511,7 +3511,7 @@ limitations under the License.
                             </xs:annotation>
                             <xs:complexType>
                                 <xs:sequence>
-                                    <xs:element name="useCase" type="xs:string" minOccurs="0" maxOccurs="1" />
+                                    <xs:element name="useCase" type="xs:string" minOccurs="0" maxOccurs="unbounded" />
                                 </xs:sequence>
                             </xs:complexType>
                         </xs:element>
@@ -3525,7 +3525,7 @@ limitations under the License.
                             </xs:annotation>
                             <xs:complexType>
                                 <xs:sequence>
-                                    <xs:element name="technicalLimitation" type="xs:string" minOccurs="0" maxOccurs="1" />
+                                    <xs:element name="technicalLimitation" type="xs:string" minOccurs="0" maxOccurs="unbounded" />
                                 </xs:sequence>
                             </xs:complexType>
                         </xs:element>
@@ -3537,7 +3537,7 @@ limitations under the License.
                             </xs:annotation>
                             <xs:complexType>
                                 <xs:sequence>
-                                    <xs:element name="performanceTradeoff" type="xs:string" minOccurs="0" maxOccurs="1" />
+                                    <xs:element name="performanceTradeoff" type="xs:string" minOccurs="0" maxOccurs="unbounded" />
                                 </xs:sequence>
                             </xs:complexType>
                         </xs:element>