diff --git a/.travis.yml b/.travis.yml
index f69f5ffa93f58b21562efcd7670e4a3555c860ed..cea8ce5f3708202060a8a1183a60b612c81e492d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,9 +4,11 @@
 #
 # For more information, see https://github.com/haskell-CI/haskell-ci
 #
-# version: 0.4
+# version: 0.9.20191213
 #
+version: ~> 1.0
 language: c
+os: linux
 dist: xenial
 git:
   # whether to recursively clone submodules
@@ -22,6 +24,7 @@ cache:
   directories:
     - $HOME/.cabal/packages
     - $HOME/.cabal/store
+    - $HOME/.hlint
 before_cache:
   - rm -fv $CABALHOME/packages/hackage.haskell.org/build-reports.log
   # remove files that are regenerated by 'cabal update'
@@ -31,39 +34,52 @@ before_cache:
   - rm -fv $CABALHOME/packages/hackage.haskell.org/01-index.tar
   - rm -fv $CABALHOME/packages/hackage.haskell.org/01-index.tar.idx
   - rm -rfv $CABALHOME/packages/head.hackage
-matrix:
+jobs:
   include:
+    - compiler: ghc-8.10.1
+      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-8.10.1","cabal-install-3.0"]}}
+      os: linux
     - compiler: ghc-8.8.1
-      addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-8.8.1","cabal-install-3.0"]}}
+      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-8.8.1","cabal-install-3.0"]}}
+      os: linux
     - compiler: ghc-8.6.5
-      addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-8.6.5","cabal-install-3.0"]}}
+      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-8.6.5","cabal-install-3.0"]}}
+      os: linux
     - compiler: ghc-8.4.4
-      addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-8.4.4","cabal-install-3.0"]}}
+      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-8.4.4","cabal-install-3.0"]}}
+      os: linux
     - compiler: ghc-8.2.2
-      addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-8.2.2","cabal-install-3.0"]}}
+      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-8.2.2","cabal-install-3.0"]}}
+      os: linux
     - compiler: ghc-8.0.2
-      addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-8.0.2","cabal-install-3.0"]}}
+      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-8.0.2","cabal-install-3.0"]}}
+      os: linux
     - compiler: ghc-7.10.3
-      addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-7.10.3","cabal-install-3.0"]}}
+      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-7.10.3","cabal-install-3.0"]}}
+      os: linux
     - compiler: ghc-7.8.4
-      addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-7.8.4","cabal-install-3.0"]}}
+      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-7.8.4","cabal-install-3.0"]}}
+      os: linux
     - compiler: ghc-7.6.3
-      addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-7.6.3","cabal-install-3.0"]}}
+      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-7.6.3","cabal-install-3.0"]}}
+      os: linux
     - compiler: ghc-7.4.2
-      addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-7.4.2","cabal-install-3.0"]}}
+      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-7.4.2","cabal-install-3.0"]}}
+      os: linux
     - compiler: ghc-7.2.2
-      addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-7.2.2","cabal-install-3.0"]}}
+      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-7.2.2","cabal-install-3.0"]}}
+      os: linux
     - compiler: ghc-7.0.4
-      addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-7.0.4","cabal-install-3.0"]}}
-    - compiler: ghc-head
-      addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-head","cabal-install-head"]}}
+      addons: {"apt":{"sources":[{"sourceline":"deb http://ppa.launchpad.net/hvr/ghc/ubuntu xenial main","key_url":"https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x063dab2bdc0b3f9fcebc378bff3aeacef6f88286"}],"packages":["ghc-7.0.4","cabal-install-3.0"]}}
+      os: linux
   allow_failures:
-    - compiler: ghc-head
     - compiler: ghc-7.0.4
     - compiler: ghc-7.2.2
+    - compiler: ghc-8.10.1
 before_install:
   - HC=$(echo "/opt/$CC/bin/ghc" | sed 's/-/\//')
   - WITHCOMPILER="-w $HC"
+  - HADDOCK=$(echo "/opt/$CC/bin/haddock" | sed 's/-/\//')
   - HCPKG="$HC-pkg"
   - unset CC
   - CABAL=/opt/ghc/bin/cabal
@@ -98,24 +114,32 @@ install:
   - TEST=--enable-tests
   - BENCH=--enable-benchmarks
   - HEADHACKAGE=false
-  - if [ $HCNUMVER -gt 80801 ] ; then HEADHACKAGE=true ; fi
+  - if [ $HCNUMVER -ge 81000 ] ; then HEADHACKAGE=true ; fi
   - rm -f $CABALHOME/config
   - |
-    echo "verbose: normal +nowrap +markoutput"          >> $CABALHOME/config
-    echo "remote-build-reporting: anonymous"            >> $CABALHOME/config
-    echo "write-ghc-environment-files: always"          >> $CABALHOME/config
-    echo "remote-repo-cache: $CABALHOME/packages"       >> $CABALHOME/config
-    echo "logs-dir:          $CABALHOME/logs"           >> $CABALHOME/config
-    echo "world-file:        $CABALHOME/world"          >> $CABALHOME/config
-    echo "extra-prog-path:   $CABALHOME/bin"            >> $CABALHOME/config
-    echo "symlink-bindir:    $CABALHOME/bin"            >> $CABALHOME/config
-    echo "installdir:        $CABALHOME/bin"            >> $CABALHOME/config
-    echo "build-summary:     $CABALHOME/logs/build.log" >> $CABALHOME/config
-    echo "store-dir:         $CABALHOME/store"          >> $CABALHOME/config
-    echo "install-dirs user"                            >> $CABALHOME/config
-    echo "  prefix: $CABALHOME"                         >> $CABALHOME/config
-    echo "repository hackage.haskell.org"               >> $CABALHOME/config
-    echo "  url: http://hackage.haskell.org/"           >> $CABALHOME/config
+    echo "verbose: normal +nowrap +markoutput"                                  >> $CABALHOME/config
+    echo "remote-build-reporting: anonymous"                                    >> $CABALHOME/config
+    echo "write-ghc-environment-files: always"                                  >> $CABALHOME/config
+    echo "remote-repo-cache: $CABALHOME/packages"                               >> $CABALHOME/config
+    echo "logs-dir:          $CABALHOME/logs"                                   >> $CABALHOME/config
+    echo "world-file:        $CABALHOME/world"                                  >> $CABALHOME/config
+    echo "extra-prog-path:   $CABALHOME/bin"                                    >> $CABALHOME/config
+    echo "symlink-bindir:    $CABALHOME/bin"                                    >> $CABALHOME/config
+    echo "installdir:        $CABALHOME/bin"                                    >> $CABALHOME/config
+    echo "build-summary:     $CABALHOME/logs/build.log"                         >> $CABALHOME/config
+    echo "store-dir:         $CABALHOME/store"                                  >> $CABALHOME/config
+    echo "install-dirs user"                                                    >> $CABALHOME/config
+    echo "  prefix: $CABALHOME"                                                 >> $CABALHOME/config
+    echo "repository hackage.haskell.org"                                       >> $CABALHOME/config
+    echo "  url: http://hackage.haskell.org/"                                   >> $CABALHOME/config
+    echo "  secure: True"                                                       >> $CABALHOME/config
+    echo "  key-threshold: 3"                                                   >> $CABALHOME/config
+    echo "  root-keys:"                                                         >> $CABALHOME/config
+    echo "    fe331502606802feac15e514d9b9ea83fee8b6ffef71335479a2e68d84adc6b0" >> $CABALHOME/config
+    echo "    1ea9ba32c526d1cc91ab5e5bd364ec5e9e8cb67179a471872f6e26f0ae773d42" >> $CABALHOME/config
+    echo "    2c6c3627bd6c982990239487f1abd02e08a02e6cf16edb105a8012d444d870c3" >> $CABALHOME/config
+    echo "    0a5c7ea47cd1b15f01f5f51a33adda7e655bc0f0b0615baa8e271f4c3351e21d" >> $CABALHOME/config
+    echo "    51f0161b906011b52c6613376b1ae937670da69322113a246a09f807c62f6921" >> $CABALHOME/config
   - |
     if $HEADHACKAGE; then
     echo "allow-newer: $($HCPKG list --simple-output | sed -E 's/([a-zA-Z-]+)-[0-9.]+/*:\1/g')" >> $CABALHOME/config
@@ -127,6 +151,9 @@ install:
     echo "              f76d08be13e9a61a377a85e2fb63f4c5435d40f8feb3e12eb05905edb8cdea89" >> $CABALHOME/config
     echo "   key-threshold: 3"                                                            >> $CABALHOME/config
     fi
+  - |
+    echo "program-default-options"                >> $CABALHOME/config
+    echo "  ghc-options: $GHCJOBS +RTS -M6G -RTS" >> $CABALHOME/config
   - cat $CABALHOME/config
   - rm -fv cabal.project cabal.project.local cabal.project.freeze
   - travis_retry ${CABAL} v2-update -v
@@ -171,7 +198,7 @@ script:
   # cabal check...
   - (cd ${PKGDIR_exceptions} && ${CABAL} -vnormal check)
   # haddock...
-  - ${CABAL} v2-haddock $WITHCOMPILER ${TEST} ${BENCH} all | color_cabal_output
+  - ${CABAL} v2-haddock $WITHCOMPILER --with-haddock $HADDOCK ${TEST} ${BENCH} all | color_cabal_output
 
-# REGENDATA ["--output=.travis.yml","--config=cabal.haskell-ci","cabal.project"]
+# REGENDATA ("0.9.20191213",["--output=.travis.yml","--config=cabal.haskell-ci","cabal.project"])
 # EOF
diff --git a/cabal.haskell-ci b/cabal.haskell-ci
index 47b96103901b35c3d3b9f58b7e29c16aa1676bad..85dd80c88dec94ef0cddead1da6220d7b4c61d8c 100644
--- a/cabal.haskell-ci
+++ b/cabal.haskell-ci
@@ -1,4 +1,3 @@
-ghc-head:               True
 no-tests-no-benchmarks: False
 unconstrained:          False
 allow-failures:         <7.3
diff --git a/exceptions.cabal b/exceptions.cabal
index fb37b1e6164d389107dfcc660f330858f83fbdfc..ea898d780d8bc4ed3bb6b72029c4385a78c00116 100644
--- a/exceptions.cabal
+++ b/exceptions.cabal
@@ -23,6 +23,7 @@ tested-with:   GHC == 7.0.4
              , GHC == 8.4.4
              , GHC == 8.6.5
              , GHC == 8.8.1
+             , GHC == 8.10.1
 synopsis:      Extensible optionally-pure exceptions
 description:   Extensible optionally-pure exceptions.