diff --git a/tests/unittests/obj-c/ODWSemanticContextTests.mm b/tests/unittests/obj-c/ODWSemanticContextTests.mm
index 143cb1896..0096dec74 100644
--- a/tests/unittests/obj-c/ODWSemanticContextTests.mm
+++ b/tests/unittests/obj-c/ODWSemanticContextTests.mm
@@ -22,11 +22,15 @@
     virtual void SetUserId(const std::string& userId, PiiKind) override { m_userId = userId; }
     virtual void SetUserAdvertisingId(const std::string& userAdvertisingId) override { m_userAdvertisingId = userAdvertisingId; }
     virtual void SetAppExperimentETag(const std::string& eTag) override { m_eTag = eTag; }
+    virtual void SetOsVersion(const std::string& osVersion) override { m_osVersion = osVersion; }
+    virtual void SetOsBuild(const std::string& osBuild) override { m_osBuild = osBuild; }
 
     std::string m_appId {};
     std::string m_userId {};
     std::string m_userAdvertisingId {};
     std::string m_eTag {};
+    std::string m_osVersion {};
+    std::string m_osBuild {};
 };
 
 @interface ODWSemanticContextTests : XCTestCase
@@ -63,4 +67,18 @@ - (void)testSetETag {
     XCTAssertEqual(nativeContext.m_eTag, "myETag");
 }
 
+- (void)testSetOsVersion {
+    TestSemanticContext nativeContext;
+    ODWSemanticContext* context = [[ODWSemanticContext alloc] initWithISemanticContext:&nativeContext];
+    [context setOsVersion:@"10.0.19041"];
+    XCTAssertEqual(nativeContext.m_osVersion, "10.0.19041");
+}
+
+- (void)testSetOsBuild {
+    TestSemanticContext nativeContext;
+    ODWSemanticContext* context = [[ODWSemanticContext alloc] initWithISemanticContext:&nativeContext];
+    [context setOsBuild:@"19041.1234"];
+    XCTAssertEqual(nativeContext.m_osBuild, "19041.1234");
+}
+
 @end
diff --git a/wrappers/obj-c/ODWSemanticContext.h b/wrappers/obj-c/ODWSemanticContext.h
index bd47d0917..356ae10c7 100644
--- a/wrappers/obj-c/ODWSemanticContext.h
+++ b/wrappers/obj-c/ODWSemanticContext.h
@@ -53,6 +53,21 @@ NS_ASSUME_NONNULL_BEGIN
  */
 -(void) setDeviceId:(nonnull NSString*)deviceId;
 
+/*!
+ @brief Set the operating system version context information of telemetry event.
+ @details Overrides the OS version that the SDK populates automatically (the `DeviceInfo.OsVersion` field). Note: in the CS3 schema `ext.os.ver` is populated from the OS build, not this field, so use setOsBuild: to override `ext.os.ver`.
+ @param osVersion A string that contains the operating system version.
+ */
+-(void) setOsVersion:(nonnull NSString*)osVersion;
+
+/*!
+ @brief Set the operating system build context information of telemetry event.
+ @details In the CS3 schema the OS version field (`ext.os.ver`) is populated from the OS build,
+ so set this if setOsVersion: alone does not update `ext.os.ver`.
+ @param osBuild A string that contains the operating system build.
+ */
+-(void) setOsBuild:(nonnull NSString*)osBuild;
+
 /*!
  @brief Set the user time zone context information of telemetry event.
  @param userTimeZone user's time zone relative to UTC, in ISO 8601 time zone format
diff --git a/wrappers/obj-c/ODWSemanticContext.mm b/wrappers/obj-c/ODWSemanticContext.mm
index e1077b908..d942873fd 100644
--- a/wrappers/obj-c/ODWSemanticContext.mm
+++ b/wrappers/obj-c/ODWSemanticContext.mm
@@ -64,6 +64,18 @@ -(void) setDeviceId:(nonnull NSString*)deviceId
     _wrappedSemanticContext->SetDeviceId(strDeviceId);
 }
 
+-(void) setOsVersion:(nonnull NSString*)osVersion
+{
+    std::string strOsVersion = std::string([osVersion UTF8String]);
+    _wrappedSemanticContext->SetOsVersion(strOsVersion);
+}
+
+-(void) setOsBuild:(nonnull NSString*)osBuild
+{
+    std::string strOsBuild = std::string([osBuild UTF8String]);
+    _wrappedSemanticContext->SetOsBuild(strOsBuild);
+}
+
 -(void) setUserTimeZone:(nonnull NSString*)userTimeZone
 {
     std::string strUserTimeZone = std::string([userTimeZone UTF8String]);
diff --git a/wrappers/swift/Sources/OneDSSwift/SemanticContext.swift b/wrappers/swift/Sources/OneDSSwift/SemanticContext.swift
index f73fac017..184d19bc4 100644
--- a/wrappers/swift/Sources/OneDSSwift/SemanticContext.swift
+++ b/wrappers/swift/Sources/OneDSSwift/SemanticContext.swift
@@ -66,6 +66,30 @@ public class SemanticContext {
         odwSemanticContext.setDeviceId(deviceID)
     }
 
+    /**
+    Set the operating system version context information of the telemetry event.
+
+    - Note: Overrides the OS version that the SDK populates automatically (the `DeviceInfo.OsVersion` field). In the CS3 schema `ext.os.ver` is populated from the OS build, not this field — use `setOsBuild(_:)` to override `ext.os.ver`.
+
+    - Parameters:
+        - osVersion: A `String` that contains the operating system version.
+    */
+    public func setOsVersion(_ osVersion: String) {
+        odwSemanticContext.setOsVersion(osVersion)
+    }
+
+    /**
+    Set the operating system build context information of the telemetry event.
+
+    - Note: In the CS3 schema the OS version field (`ext.os.ver`) is populated from the OS build, so set this if `setOsVersion(_:)` alone does not update `ext.os.ver`.
+
+    - Parameters:
+        - osBuild: A `String` that contains the operating system build.
+    */
+    public func setOsBuild(_ osBuild: String) {
+        odwSemanticContext.setOsBuild(osBuild)
+    }
+
     /**
     Set the user time zone context information of telemetry event.
 
diff --git a/wrappers/xamarin/sdk/OneDsCppSdk.iOS.Bindings/ApiDefinitions.cs b/wrappers/xamarin/sdk/OneDsCppSdk.iOS.Bindings/ApiDefinitions.cs
index 9939ec966..30ec7efc9 100644
--- a/wrappers/xamarin/sdk/OneDsCppSdk.iOS.Bindings/ApiDefinitions.cs
+++ b/wrappers/xamarin/sdk/OneDsCppSdk.iOS.Bindings/ApiDefinitions.cs
@@ -281,6 +281,14 @@ public interface SemanticContext
         [Export ("setDeviceId:")]
         void SetDeviceId (string deviceId);
 
+        // -(void)setOsVersion:(NSString * _Nonnull)osVersion;
+        [Export ("setOsVersion:")]
+        void SetOsVersion (string osVersion);
+
+        // -(void)setOsBuild:(NSString * _Nonnull)osBuild;
+        [Export ("setOsBuild:")]
+        void SetOsBuild (string osBuild);
+
         // -(void)setUserTimeZone:(NSString * _Nonnull)userTimeZone;
         [Export ("setUserTimeZone:")]
         void SetUserTimeZone (string userTimeZone);