diff --git a/.ci/run-elasticsearch.sh b/.ci/run-elasticsearch.sh
index 7428b2f..abcde11 100755
--- a/.ci/run-elasticsearch.sh
+++ b/.ci/run-elasticsearch.sh
@@ -146,7 +146,7 @@ set -x
 docker run \
   --name "$NODE_NAME" \
   --network "$NETWORK_NAME" \
-  --env ES_JAVA_OPTS=-"Xms1g -Xmx1g" \
+  --env ES_JAVA_OPTS=-"Xms2g -Xmx2g" \
   "${environment[@]}" \
   "${volumes[@]}" \
   --publish "$HTTP_PORT":9200 \
diff --git a/.ci/test-matrix.yml b/.ci/test-matrix.yml
index aa09962..5b4ed7a 100644
--- a/.ci/test-matrix.yml
+++ b/.ci/test-matrix.yml
@@ -3,6 +3,7 @@
 ELASTICSEARCH_VERSION:
   - '8.6.0-SNAPSHOT'
   - '8.7.0-SNAPSHOT'
+  - '8.8.0-SNAPSHOT'
 
 PANDAS_VERSION:
   - '1.5.0'