diff --git a/testsuite/gtk/builder.c b/testsuite/gtk/builder.c
index 88e25e7229..51f53bd5bd 100644
--- a/testsuite/gtk/builder.c
+++ b/testsuite/gtk/builder.c
@@ -2308,7 +2308,7 @@ test_anaconda_signal (void)
   const char buffer[] = 
     "<?xml version='1.0' encoding='UTF-8'?>"
     "<interface>"
-    "  <requires lib='gtk' version='3.99'/>"
+    "  <requires lib='gtk' version='4.0'/>"
     "  <object class='GtkListStore' id='liststore1'>"
     "    <columns>"
     "      <!-- column-name use -->"
diff --git a/testsuite/tools/validate-data/invalid5.expected b/testsuite/tools/validate-data/invalid5.expected
index efe4d76422..615264a579 100644
--- a/testsuite/tools/validate-data/invalid5.expected
+++ b/testsuite/tools/validate-data/invalid5.expected
@@ -1 +1 @@
-invalid5.ui:3:1 Required GTK version 5.10, current version is 3.99
+invalid5.ui:3:1 Required GTK version 5.10, current version is 4.0
diff --git a/testsuite/tools/validate-data/valid3.ui b/testsuite/tools/validate-data/valid3.ui
index 53d335aaec..d913a7e598 100644
--- a/testsuite/tools/validate-data/valid3.ui
+++ b/testsuite/tools/validate-data/valid3.ui
@@ -1,5 +1,5 @@
 <interface>
-  <requires lib="gtk" version="3.99"/>
+  <requires lib="gtk" version="4.0"/>
   <object class="GtkWindow">
   </object>
 </interface>