diff --git a/Gemini.xcodeproj/project.pbxproj b/Gemini.xcodeproj/project.pbxproj
index e7fadb2..817ae0e 100644
--- a/Gemini.xcodeproj/project.pbxproj
+++ b/Gemini.xcodeproj/project.pbxproj
@@ -933,7 +933,7 @@
 					"$(inherited)",
 					"@executable_path/../Frameworks",
 				);
-				MACOSX_DEPLOYMENT_TARGET = 10.16;
+				MACOSX_DEPLOYMENT_TARGET = 10.15;
 				PRODUCT_BUNDLE_IDENTIFIER = net.shadowfacts.Gemini;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;
@@ -958,7 +958,7 @@
 					"$(inherited)",
 					"@executable_path/../Frameworks",
 				);
-				MACOSX_DEPLOYMENT_TARGET = 10.16;
+				MACOSX_DEPLOYMENT_TARGET = 10.15;
 				PRODUCT_BUNDLE_IDENTIFIER = net.shadowfacts.Gemini;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 5.0;
diff --git a/Gemini/BrowserWindowController.swift b/Gemini/BrowserWindowController.swift
index 3905a89..ad971f2 100644
--- a/Gemini/BrowserWindowController.swift
+++ b/Gemini/BrowserWindowController.swift
@@ -99,7 +99,11 @@ extension BrowserWindowController: NSToolbarDelegate {
     
     private func createBackToolbarItem() -> NSToolbarItem {
         let item = NSToolbarItem(itemIdentifier: .goBack)
-        item.image = NSImage(systemSymbolName: "chevron.left", accessibilityDescription: "Go Back")
+        if #available(macOS 10.16, *) {
+            item.image = NSImage(systemSymbolName: "chevron.left", accessibilityDescription: "Go Back")
+        } else {
+            item.image = NSImage(named: NSImage.goBackTemplateName)
+        }
         item.label = "Go Back"
         item.paletteLabel = "Go Back"
         item.toolTip = "Go to the previous page"
@@ -114,7 +118,11 @@ extension BrowserWindowController: NSToolbarDelegate {
     
     private func createForwardToolbarItem() -> NSToolbarItem {
         let item = NSToolbarItem(itemIdentifier: .goForward)
-        item.image = NSImage(systemSymbolName: "chevron.right", accessibilityDescription: "Go Forward")
+        if #available(macOS 10.16, *) {
+            item.image = NSImage(systemSymbolName: "chevron.right", accessibilityDescription: "Go Forward")
+        } else {
+            item.image = NSImage(named: NSImage.goForwardTemplateName)
+        }
         item.label = "Go Forward"
         item.paletteLabel = "Go Forward"
         item.toolTip = "Go to the next page"