Index: .github/workflows/build.yml
===================================================================
diff -u -r96e51f570e58f2fbe37105f9f0bc01e446795b65 -r60e1207a3ea419939a0f55d47f1e87e363759bc1
--- .github/workflows/build.yml	(.../build.yml)	(revision 96e51f570e58f2fbe37105f9f0bc01e446795b65)
+++ .github/workflows/build.yml	(.../build.yml)	(revision 60e1207a3ea419939a0f55d47f1e87e363759bc1)
@@ -66,7 +66,7 @@
             experimental: [false]
           - os: macos-latest
             compiler: gcc-11
-            tcltag: core-8-6-12
+            tcltag: core-8-6-13
             experimental: [false]
           - os: macos-latest
             compiler: gcc-11
@@ -78,20 +78,20 @@
             experimental: [false]
           - os: ubuntu-latest
             compiler: gcc-10
-            tcltag: core-8-6-12
+            tcltag: core-8-6-13
             experimental: [false]
           - os: ubuntu-latest
             compiler: gcc-10
             tcltag: core-8-7-a5
             experimental: [false]
           - os: ubuntu-latest
             compiler: gcc-10
-            tcltag: core-8-6-13-rc
-            experimental: [true]
+            tcltag: core-9-0-a3
+            experimental: [false]
           - os: macos-latest
             compiler: gcc-11
-            tcltag: core-8-6-13-rc
-            experimental: [true]
+            tcltag: core-9-0-a3
+            experimental: [false]
     defaults:
       run:
         shell: bash