diff --git a/.circleci/config.yml b/.circleci/config.yml
index 77d5a06..96a5b8e 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -71,6 +71,3 @@ workflows:
       - linux-job: { name: 'Linux Clang 7', cxx: clang++-7, packages: clang-7, llvm_os: bionic, llvm_ver: '7' }
       - linux-job: { name: 'Linux Clang 6.0', cxx: clang++-6.0, packages: clang-6.0, llvm_os: bionic, llvm_ver: '6.0' }
       - linux-job: { name: 'Linux Clang 5.0', cxx: clang++-5.0, packages: clang-5.0, llvm_os: bionic, llvm_ver: '5.0' }
-      - linux-job: { name: 'Linux Clang 4.0', cxx: clang++-4.0, packages: clang-4.0, llvm_os: bionic, llvm_ver: '4.0' }
-      - linux-job: { name: 'Linux Clang 3.9', cxx: clang++-3.9, packages: clang-3.9, llvm_os: bionic, llvm_ver: '3.9' }
-      - linux-job: { name: 'Linux Clang 3.8', cxx: clang++-3.8, packages: clang-3.8, llvm_os: bionic, llvm_ver: '3.8' }