diff --git a/src/slic3r/GUI/AppConfig.cpp b/src/slic3r/GUI/AppConfig.cpp
index 96213447c..5a165e8ae 100644
--- a/src/slic3r/GUI/AppConfig.cpp
+++ b/src/slic3r/GUI/AppConfig.cpp
@@ -26,7 +26,7 @@ namespace Slic3r {
 
 static const std::string VENDOR_PREFIX = "vendor:";
 static const std::string MODEL_PREFIX = "model:";
-static const std::string VERSION_CHECK_URL = "http://files.prusa3d.com/wp-content/uploads/repository/PrusaSlicer-settings-master/live/PrusaSlicer.version";
+static const std::string VERSION_CHECK_URL = "https://files.prusa3d.com/wp-content/uploads/repository/PrusaSlicer-settings-master/live/PrusaSlicer.version";
 
 void AppConfig::reset()
 {
diff --git a/src/slic3r/Utils/PresetUpdater.cpp b/src/slic3r/Utils/PresetUpdater.cpp
index d55063c7b..5723afca2 100644
--- a/src/slic3r/Utils/PresetUpdater.cpp
+++ b/src/slic3r/Utils/PresetUpdater.cpp
@@ -245,6 +245,16 @@ void PresetUpdater::priv::sync_version() const
 		})
 		.on_complete([&](std::string body, unsigned /* http_status */) {
 			boost::trim(body);
+			const auto nl_pos = body.find_first_of("\n\r");
+			if (nl_pos != std::string::npos) {
+				body.resize(nl_pos);
+			}
+
+			if (! Semver::parse(body)) {
+				BOOST_LOG_TRIVIAL(warning) << boost::format("Received invalid contents from `%1%`: Not a correct semver: `%2%`") % SLIC3R_APP_NAME % body;
+				return;
+			}
+
 			BOOST_LOG_TRIVIAL(info) << boost::format("Got %1% online version: `%2%`. Sending to GUI thread...") % SLIC3R_APP_NAME % body;
 
 			wxCommandEvent* evt = new wxCommandEvent(EVT_SLIC3R_VERSION_ONLINE);