diff --git a/.travis.yml b/.travis.yml
index 04a2ffb..115991f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,7 +16,7 @@ before_install:
   - cppcheck --version
   # for clang-format 10
   - wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
-  - sudo add-apt-repository 'deb http://apt.llvm.org/bionic/   llvm-toolchain-bionic  main'
+  - sudo add-apt-repository 'deb http://apt.llvm.org/bionic/   llvm-toolchain-bionic-10 main'
   - sudo apt-get update
   - sudo apt-get install clang-format-10
   - clang-format-10 --version