diff --git a/runtime/bin/security_context.cc b/runtime/bin/security_context.cc
index d2cd927..ee431c8 100644
--- a/runtime/bin/security_context.cc
+++ b/runtime/bin/security_context.cc
@@ -807,7 +807,7 @@
   SSLFilter::InitializeLibrary();
   SSL_CTX* ctx = SSL_CTX_new(TLS_method());
   SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, SSLCertContext::CertificateCallback);
-  SSL_CTX_set_min_proto_version(ctx, TLS1_VERSION);
+  SSL_CTX_set_min_proto_version(ctx, TLS1_2_VERSION);
   SSL_CTX_set_cipher_list(ctx, "HIGH:MEDIUM");
   SSLCertContext* context = new SSLCertContext(ctx);
   Dart_Handle err = SetSecurityContext(args, context);