Index: .travis.yml
===================================================================
diff -u -N -r1544e5c005ac27a7806c8b11d806c3f58d3ed2c9 -r9808a2f313759926b7881c8c0c283d13bcf55371
--- .travis.yml	(.../.travis.yml)	(revision 1544e5c005ac27a7806c8b11d806c3f58d3ed2c9)
+++ .travis.yml	(.../.travis.yml)	(revision 9808a2f313759926b7881c8c0c283d13bcf55371)
@@ -40,7 +40,7 @@
     - os: linux
       dist: xenial
       compiler: clang
-      env: TCLTAG=core-8-7-a1
+      env: TCLTAG=core-8-7-a3
     - os: linux
       dist: xenial
       compiler: gcc-7
@@ -50,15 +50,15 @@
             - ubuntu-toolchain-r-test
           packages:
             - g++-7
-      env: TCLTAG=core-8-7-a1
+      env: TCLTAG=core-8-7-a3
     - os: osx
       osx_image: xcode10.2
       compiler: clang
-      env: TCLTAG=core-8-7-a1
+      env: TCLTAG=core-8-7-a3
     - os: osx
       osx_image: xcode10.2	
       compiler: gcc-8
-      env: TCLTAG=core-8-7-a1
+      env: TCLTAG=core-8-7-a3
     # ----------------------------
     - os: linux
       dist: xenial
@@ -111,7 +111,7 @@
     - os: linux
       dist: xenial
       compiler: clang
-      env: TCLTAG=core-8-6-9
+      env: TCLTAG=core-8-6-10
     - os: linux
       dist: xenial
       compiler: gcc-7
@@ -121,16 +121,16 @@
             - ubuntu-toolchain-r-test
           packages:
             - g++-7
-      env: TCLTAG=core-8-6-9
+      env: TCLTAG=core-8-6-10
     - os: osx
       osx_image: xcode10.2
       compiler: clang
-      env: TCLTAG=core-8-6-9
+      env: TCLTAG=core-8-6-10
     - os: osx
       osx_image: xcode10.2	
       compiler: gcc-8
       env:
-        - TCLTAG=core-8-6-9
+        - TCLTAG=core-8-6-10
   # ----------------------------
     - os: linux
       dist: xenial