diff --git a/.kokoro/gas/trigger.sh b/.kokoro/gas/trigger.sh
index 1c2a099..eee9e3b 100755
--- a/.kokoro/gas/trigger.sh
+++ b/.kokoro/gas/trigger.sh
@@ -7,8 +7,5 @@ set -eo pipefail
 export GEM_HOME=$HOME/.gem
 export PATH=$GEM_HOME/bin:$PATH
 
-# Force Docker client to use legacy API version 1.39 to match Kokoro host daemon.
-export DOCKER_API_VERSION=1.39
-
 cd gas
 toys gas kokoro-trigger -v