Index: .github/workflows/build.yml
===================================================================
diff -u -r3bd2a94ec9bf20b065bdc5e46d46c763a34bfa61 -r621d7ad1c7ee36f9fb8400cb21e5441da3d016de
--- .github/workflows/build.yml	(.../build.yml)	(revision 3bd2a94ec9bf20b065bdc5e46d46c763a34bfa61)
+++ .github/workflows/build.yml	(.../build.yml)	(revision 621d7ad1c7ee36f9fb8400cb21e5441da3d016de)
@@ -71,7 +71,7 @@
             experimental: [false]
           - os: macos-latest
             compiler: gcc-11
-            tcltag: core-9-0-b2
+            tcltag: core-9-0-b3
             experimental: [false]
           - os: ubuntu-latest
             compiler: gcc-10
@@ -83,7 +83,7 @@
             experimental: [false]
           - os: ubuntu-latest
             compiler: gcc-10
-            tcltag: core-9-0-b2
+            tcltag: core-9-0-b3
             experimental: [false]
     defaults:
       run: