Index: .github/workflows/build.yml
===================================================================
diff -u -rcb2f6683e20ac4db20a8350a7dfe0c6dfb3e8716 -r3bd2a94ec9bf20b065bdc5e46d46c763a34bfa61
--- .github/workflows/build.yml	(.../build.yml)	(revision cb2f6683e20ac4db20a8350a7dfe0c6dfb3e8716)
+++ .github/workflows/build.yml	(.../build.yml)	(revision 3bd2a94ec9bf20b065bdc5e46d46c763a34bfa61)
@@ -71,7 +71,7 @@
             experimental: [false]
           - os: macos-latest
             compiler: gcc-11
-            tcltag: core-9-0-b1
+            tcltag: core-9-0-b2
             experimental: [false]
           - os: ubuntu-latest
             compiler: gcc-10
@@ -83,7 +83,7 @@
             experimental: [false]
           - os: ubuntu-latest
             compiler: gcc-10
-            tcltag: core-9-0-b1
+            tcltag: core-9-0-b2
             experimental: [false]
     defaults:
       run: