diff --git a/mcp-core/src/main/java/io/modelcontextprotocol/spec/McpStreamableServerTransportProvider.java b/mcp-core/src/main/java/io/modelcontextprotocol/spec/McpStreamableServerTransportProvider.java
index 09fe9fb0e..467a432c8 100644
--- a/mcp-core/src/main/java/io/modelcontextprotocol/spec/McpStreamableServerTransportProvider.java
+++ b/mcp-core/src/main/java/io/modelcontextprotocol/spec/McpStreamableServerTransportProvider.java
@@ -4,6 +4,8 @@
 
 package io.modelcontextprotocol.spec;
 
+import java.util.List;
+
 import reactor.core.publisher.Mono;
 
 /**
@@ -66,4 +68,16 @@ default void close() {
 	 */
 	Mono<Void> closeGracefully();
 
+	/**
+	 * Streamable HTTP was introduced in protocol version {@code 2025-03-26}, so providers
+	 * of this transport cannot serve {@code 2024-11-05} clients and must not advertise
+	 * that version.
+	 * @return the protocol versions supported by Streamable HTTP transport providers
+	 */
+	@Override
+	default List<String> protocolVersions() {
+		return List.of(ProtocolVersions.MCP_2025_03_26, ProtocolVersions.MCP_2025_06_18,
+				ProtocolVersions.MCP_2025_11_25);
+	}
+
 }
diff --git a/mcp-core/src/test/java/io/modelcontextprotocol/spec/ServerTransportProtocolVersionsTests.java b/mcp-core/src/test/java/io/modelcontextprotocol/spec/ServerTransportProtocolVersionsTests.java
new file mode 100644
index 000000000..ec4fc96e1
--- /dev/null
+++ b/mcp-core/src/test/java/io/modelcontextprotocol/spec/ServerTransportProtocolVersionsTests.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2024-2025 the original author or authors.
+ */
+
+package io.modelcontextprotocol.spec;
+
+import java.util.List;
+
+import io.modelcontextprotocol.server.McpStatelessServerHandler;
+import org.junit.jupiter.api.Test;
+import reactor.core.publisher.Mono;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Verifies that each server transport abstraction advertises only the protocol versions
+ * it can actually serve.
+ */
+class ServerTransportProtocolVersionsTests {
+
+	private static final List<String> STREAMABLE_HTTP_VERSIONS = List.of(ProtocolVersions.MCP_2025_03_26,
+			ProtocolVersions.MCP_2025_06_18, ProtocolVersions.MCP_2025_11_25);
+
+	private static final McpStreamableServerTransportProvider STREAMABLE_PROVIDER = new McpStreamableServerTransportProvider() {
+		@Override
+		public void setSessionFactory(McpStreamableServerSession.Factory sessionFactory) {
+		}
+
+		@Override
+		public Mono<Void> notifyClients(String method, Object params) {
+			return Mono.empty();
+		}
+
+		@Override
+		public Mono<Void> closeGracefully() {
+			return Mono.empty();
+		}
+	};
+
+	private static final McpStatelessServerTransport STATELESS_TRANSPORT = new McpStatelessServerTransport() {
+		@Override
+		public void setMcpHandler(McpStatelessServerHandler mcpHandler) {
+		}
+
+		@Override
+		public Mono<Void> closeGracefully() {
+			return Mono.empty();
+		}
+	};
+
+	@Test
+	void streamableProviderDoesNotAdvertiseVersionsPredatingStreamableHttp() {
+		assertThat(STREAMABLE_PROVIDER.protocolVersions()).doesNotContain(ProtocolVersions.MCP_2024_11_05)
+			.containsExactlyElementsOf(STREAMABLE_HTTP_VERSIONS);
+	}
+
+	@Test
+	void statelessTransportDoesNotAdvertiseVersionsPredatingStreamableHttp() {
+		assertThat(STATELESS_TRANSPORT.protocolVersions()).doesNotContain(ProtocolVersions.MCP_2024_11_05)
+			.containsExactlyElementsOf(STREAMABLE_HTTP_VERSIONS);
+	}
+
+	@Test
+	void transportsWithoutStreamableHttpConstraintKeepTheFullRange() {
+		McpServerTransportProviderBase base = new McpServerTransportProviderBase() {
+			@Override
+			public Mono<Void> notifyClients(String method, Object params) {
+				return Mono.empty();
+			}
+
+			@Override
+			public Mono<Void> closeGracefully() {
+				return Mono.empty();
+			}
+		};
+
+		assertThat(base.protocolVersions()).containsExactly(ProtocolVersions.MCP_2024_11_05,
+				ProtocolVersions.MCP_2025_03_26, ProtocolVersions.MCP_2025_06_18, ProtocolVersions.MCP_2025_11_25);
+	}
+
+}