diff --git a/plugins/woocommerce/changelog/update-purge-cache-siteground-wpengine b/plugins/woocommerce/changelog/update-purge-cache-siteground-wpengine
new file mode 100644
index 00000000000..03183c43623
--- /dev/null
+++ b/plugins/woocommerce/changelog/update-purge-cache-siteground-wpengine
@@ -0,0 +1,4 @@
+Significance: patch
+Type: update
+
+Invalidate cache for SiteGround Speed Optimizer
diff --git a/plugins/woocommerce/src/Internal/ComingSoon/ComingSoonCacheInvalidator.php b/plugins/woocommerce/src/Internal/ComingSoon/ComingSoonCacheInvalidator.php
index a2101519adf..8c8b8a043a8 100644
--- a/plugins/woocommerce/src/Internal/ComingSoon/ComingSoonCacheInvalidator.php
+++ b/plugins/woocommerce/src/Internal/ComingSoon/ComingSoonCacheInvalidator.php
@@ -39,5 +39,10 @@ class ComingSoonCacheInvalidator {
 				)
 			);
 		}
+
+		// Invalidate the SiteGround Speed Optimizer cache.
+		if ( function_exists( '\sg_cachepress_purge_cache' ) ) {
+			\sg_cachepress_purge_cache();
+		}
 	}
 }