diff --git a/.github/actions/start-opensearch/action.yml b/.github/actions/start-opensearch/action.yml
index 5b31baec..cf3dfbeb 100644
--- a/.github/actions/start-opensearch/action.yml
+++ b/.github/actions/start-opensearch/action.yml
@@ -25,6 +25,7 @@ runs:
           brew install -q coreutils
         fi
         OPENSEARCH_HOME=$(realpath ./opensearch-*)
+        OPENSEARCH_JAVA_OPTS="-Djava.net.preferIPv4Stack=true"
 
         url="http://localhost:9200"
         cp ./client/.ci/opensearch/opensearch.yml $OPENSEARCH_HOME/config/
@@ -47,7 +48,6 @@ runs:
         fi
 
         echo "url=$url" >> $GITHUB_OUTPUT
-
         if [[ "$RUNNER_OS" == "Linux" ]]; then
           sudo swapoff -a
           sudo sysctl -w vm.swappiness=1
@@ -59,12 +59,12 @@ runs:
         if [[ "$RUNNER_OS" != "Windows" ]]; then
           $OPENSEARCH_HOME/bin/opensearch &
         else
-          cmd.exe /C "$(cygpath -alw $OPENSEARCH_HOME/bin/opensearch.bat) -d" &
+          $OPENSEARCH_HOME/bin/opensearch.bat -d &
         fi
 
         for attempt in {1..20}; do
           sleep 5
-          if curl -sS --cacert ./client/.ci/certs/root-ca.crt -u admin:admin $url; then
+          if curl -k -sS --cacert ./client/.ci/certs/root-ca.crt -u admin:admin $url; then
             echo '=====> ready'
             exit 0
           fi
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index b4055a40..82ecd08b 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -33,7 +33,7 @@ jobs:
         id: opensearch
         uses: ./client/.github/actions/run-released-opensearch
         with:
-          version: 2.6.0
+          version: 2.8.0
           secured: true
 
       - name: Run Tests (${{ matrix.test-args }})
@@ -63,7 +63,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: ['1.1.0', '1.2.4', '1.3.4', '2.2.0', '2.4.0', '2.6.0']
+        version: ['1.1.0', '1.2.4', '1.3.4', '2.2.0', '2.4.0', '2.6.0', '2.8.0']
         secured: [true, false]
     steps:
       - name: Checkout Rust Client