diff --git a/.circleci/config.yml b/.circleci/config.yml
index 03120e0bb..95dccb2c8 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1204,39 +1204,16 @@ workflows:
 
   main:
     jobs:
-      # basic checks
-      - chk_spelling: *workflow_trigger_on_tags
-      - chk_coding_style: *workflow_trigger_on_tags
-      # DISABLED FOR 0.6.0 - chk_docs_examples: *workflow_trigger_on_tags
-      - chk_buglist: *workflow_trigger_on_tags
-      - chk_proofs: *workflow_trigger_on_tags
-      - chk_pylint: *workflow_trigger_on_tags
-      - chk_errorcodes: *workflow_trigger_on_tags
-      - chk_antlr_grammar: *workflow_trigger_on_tags
-      - chk_docs_pragma_min_version: *workflow_trigger_on_tags
-      - t_ubu_pyscripts: *workflow_trigger_on_tags
-      - t_win_pyscripts: *workflow_trigger_on_tags
-
-      # build-only
-      - b_docs: *workflow_trigger_on_tags
-      - b_ubu_cxx20: *workflow_trigger_on_tags
-      - b_ubu_ossfuzz: *workflow_trigger_on_tags
-
       # OS/X build and tests
       - b_osx: *workflow_trigger_on_tags
-      - t_osx_cli: *workflow_osx
       - t_osx_soltest: *workflow_osx
 
       # ArchLinux build and tests
       - b_archlinux: *workflow_trigger_on_tags
       - t_archlinux_soltest: *workflow_archlinux
 
-      # Static build
-      - b_ubu_static: *workflow_trigger_on_tags
-
       # Ubuntu build and tests
       - b_ubu: *workflow_trigger_on_tags
-      - t_ubu_cli: *workflow_ubuntu2004
       - t_ubu_soltest_all: *workflow_ubuntu2004
       - t_ubu_soltest_enforce_yul: *workflow_ubuntu2004
       - b_ubu_clang: *workflow_trigger_on_tags
@@ -1244,113 +1221,10 @@ workflows:
 
       # Ubuntu fake release build and tests
       - b_ubu_release: *workflow_trigger_on_tags
-      - t_ubu_release_cli: *workflow_ubuntu2004_release
       - t_ubu_release_soltest_all: *workflow_ubuntu2004_release
 
-      # Emscripten build and tests that take 15 minutes or less
-      - b_ems: *workflow_trigger_on_tags
-      - t_ems_solcjs: *workflow_emscripten
-      - t_ems_ext_hardhat: *workflow_emscripten
-
-      # Separate compile-only runs of those external tests where a full run takes much longer.
-      - t_ems_ext:
-          <<: *workflow_emscripten
-          name: t_ems_compile_ext_colony
-          project: colony
-          compile_only: 1
-      - t_ems_ext:
-          <<: *workflow_emscripten
-          name: t_ems_compile_ext_gnosis
-          project: gnosis
-          compile_only: 1
-
-      # FIXME: Gnosis tests are pretty flaky right now. They often fail on CircleCI due to random ProviderError
-      # and there are also other less frequent problems. See https://github.com/gnosis/safe-contracts/issues/216.
-      #- t_ems_ext:
-      #    <<: *workflow_emscripten
-      #    name: t_ems_test_ext_gnosis
-      #    project: gnosis
-      #    # NOTE: Tests do not start on node.js 14 ("ganache-cli exited early with code 1").
-      #    nodejs_version: 12
-      - t_ems_ext:
-          <<: *workflow_emscripten
-          name: t_ems_test_ext_gnosis_v2
-          project: gnosis-v2
-          # NOTE: Tests do not start on node.js 14 ("ganache-cli exited early with code 1").
-          nodejs_version: 12
-      - t_ems_ext:
-          <<: *workflow_emscripten
-          name: t_ems_test_ext_zeppelin
-          project: zeppelin
-      - t_ems_ext:
-          <<: *workflow_emscripten
-          name: t_ems_test_ext_ens
-          project: ens
-          # NOTE: One of the dependencies (fsevents) fails to build its native extension on node.js 12+.
-          nodejs_version: 10
-
       # Windows build and tests
       - b_win: *workflow_trigger_on_tags
       - b_win_release: *workflow_trigger_on_tags
       - t_win_soltest: *workflow_win
       - t_win_release_soltest: *workflow_win_release
-
-      # Bytecode comparison:
-      - b_bytecode_ubu:
-          requires:
-            - b_ubu
-      - b_bytecode_win:
-          requires:
-            - b_win
-      - b_bytecode_osx:
-          requires:
-            - b_osx
-      - b_bytecode_ems:
-          requires:
-            - b_ems
-      - t_bytecode_compare:
-          requires:
-            - b_bytecode_ubu
-            - b_bytecode_win
-            - b_bytecode_osx
-            - b_bytecode_ems
-
-  nightly:
-
-    triggers:
-      - schedule:
-          cron: "0 0 * * *"
-          filters:
-            branches:
-              only:
-                - develop
-
-    jobs:
-      # OSSFUZZ builds and (regression) tests
-      - b_ubu_ossfuzz: *workflow_trigger_on_tags
-      - t_ubu_ossfuzz: *workflow_ubuntu1604_ossfuzz
-
-      # Code Coverage enabled build and tests
-      - b_ubu_codecov: *workflow_trigger_on_tags
-      - t_ubu_codecov: *workflow_ubuntu2004_codecov
-
-      # ASan build and tests
-      - b_ubu_asan: *workflow_trigger_on_tags
-      - b_ubu_asan_clang: *workflow_trigger_on_tags
-      - t_ubu_asan_soltest: *workflow_ubuntu2004_asan
-      - t_ubu_asan_clang_soltest: *workflow_ubuntu2004_asan_clang
-      - t_ubu_asan_cli: *workflow_ubuntu2004_asan
-
-      # UBSan build and tests
-      - b_ubu_ubsan_clang: *workflow_trigger_on_tags
-      - t_ubu_ubsan_clang_soltest: *workflow_ubuntu2004_ubsan_clang
-      - t_ubu_ubsan_clang_cli: *workflow_ubuntu2004_ubsan_clang
-
-      # Emscripten build and tests that take more than 15 minutes to execute
-      - b_ems: *workflow_trigger_on_tags
-      - t_ems_ext:
-          <<: *workflow_emscripten
-          name: t_ems_test_ext_colony
-          project: colony
-          resource_class: medium
-          gitter_notify: yes