diff --git a/.ci/install.sh b/.ci/install.sh
index 409d44c0..35e9b561 100755
--- a/.ci/install.sh
+++ b/.ci/install.sh
@@ -5,7 +5,7 @@ set -ex
 if [ $TRAVIS_OS_NAME == osx ]; then
     brew update
     brew install qt5 lmdb clang-format ninja libsodium cmark
-    brew upgrade boost
+    brew upgrade --ignore-dependencies boost cmake
 
     curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
     sudo python get-pip.py