diff --git a/tools/install-R.sh b/tools/install-R.sh
index 33394d4..b23d294 100644
--- a/tools/install-R.sh
+++ b/tools/install-R.sh
@@ -17,8 +17,7 @@ if [ "x$TRAVIS_OS_NAME" = "xlinux" ] ; then
     R -e "install.packages('IRkernel', repos='http://cran.mirrors.hoobly.com')"
     R -e "IRkernel::installspec()"
 elif [ "x$TRAVIS_OS_NAME" = "xosx" ]; then
-    brew update
-    brew list r &>/dev/null || brew install r
+    brew list r &>/dev/null || HOMEBREW_NO_AUTO_UPDATE=1 brew install r
     R -e "install.packages('IRkernel', repos='http://cran.mirrors.hoobly.com')"
     R -e "IRkernel::installspec()"
 fi
diff --git a/tools/install-julia.sh b/tools/install-julia.sh
index 790c7c8..2de02d2 100644
--- a/tools/install-julia.sh
+++ b/tools/install-julia.sh
@@ -16,8 +16,7 @@ if [ "x$TRAVIS_OS_NAME" = "xlinux" ] ; then
     julia --version
     julia -e 'import Pkg; Pkg.add("IJulia")'
 elif [ "x$TRAVIS_OS_NAME" = "xosx" ]; then
-    brew update
-    brew cask list julia &>/dev/null || brew cask install julia
+    brew cask list julia &>/dev/null || HOMEBREW_NO_AUTO_UPDATE=1 brew cask install julia
     julia --version
     julia -e 'import Pkg; Pkg.add("IJulia")'
 fi
diff --git a/tools/install-virtualenv.sh b/tools/install-virtualenv.sh
index 05beee1..b3e886d 100644
--- a/tools/install-virtualenv.sh
+++ b/tools/install-virtualenv.sh
@@ -9,7 +9,7 @@ WORKDIR=${HOME}/local
 . tools/retry.sh
 
 if [ "x$TRAVIS_OS_NAME" = "xosx" ]; then
-    brew list pyenv-virtualenv || HOMEBREW_NO_AUTO_UPDATE=1 brew install pyenv-virtualenv
+    brew list pyenv-virtualenv &>/dev/null || HOMEBREW_NO_AUTO_UPDATE=1 brew install pyenv-virtualenv
 
     case "${TOXENV}" in
         py27)