diff --git a/.github/workflows/cluster.yaml b/.github/workflows/cluster.yaml
index e9737465..fdb92a30 100644
--- a/.github/workflows/cluster.yaml
+++ b/.github/workflows/cluster.yaml
@@ -43,15 +43,6 @@ jobs:
           sudo apt-get update
           sudo apt-get -y upgrade
           sudo apt-get -y install skopeo
-          # install notation
-          curl -Lo notation.tar.gz https://github.com/notaryproject/notation/releases/download/v0.7.1-alpha.1/notation_0.7.1-alpha.1_linux_amd64.tar.gz
-          sudo tar xvzf notation.tar.gz -C /usr/bin notation
-          # install oras
-          curl -LO https://github.com/oras-project/oras/releases/download/v0.12.0/oras_0.12.0_linux_amd64.tar.gz
-          mkdir -p oras-install/
-          tar -zxf oras_0.12.0_*.tar.gz -C oras-install/
-          sudo mv oras-install/oras /usr/bin/
-          rm -rf oras_0.12.0_*.tar.gz oras-install/
 
           # install haproxy
           sudo apt-get install haproxy
@@ -120,11 +111,11 @@ jobs:
             skopeo --debug copy --src-tls-verify=false docker://localhost:8080/golang:1.18 oci:golang:1.18
             echo "{\"name\":\"foo\",\"value\":\"bar\"}" > config.json
             echo "hello world" > artifact.txt
-            oras push localhost:8080/hello-artifact:v2 \
+            oras push --plain-http localhost:8080/hello-artifact:v2 \
                 --manifest-config config.json:application/vnd.acme.rocket.config.v1+json \
                     artifact.txt:text/plain -d -v
             rm -f artifact.txt # first delete the file
-            oras pull localhost:8080/hello-artifact:v2 -d -v -a
+            oras pull --plain-http localhost:8080/hello-artifact:v2 -d -v
             grep -q "hello world" artifact.txt  # should print "hello world"
             if [ $? -ne 0 ]; then \
               killall -r zot-*; \
diff --git a/.github/workflows/ecosystem-tools.yaml b/.github/workflows/ecosystem-tools.yaml
index b94aaf57..295c235f 100644
--- a/.github/workflows/ecosystem-tools.yaml
+++ b/.github/workflows/ecosystem-tools.yaml
@@ -32,15 +32,6 @@ jobs:
           sudo apt-get update
           sudo apt-get -y upgrade
           sudo apt-get -y install skopeo
-          # install notation
-          curl -Lo notation.tar.gz https://github.com/notaryproject/notation/releases/download/v0.7.1-alpha.1/notation_0.7.1-alpha.1_linux_amd64.tar.gz
-          sudo tar xvzf notation.tar.gz -C /usr/bin notation
-          # install oras
-          curl -LO https://github.com/oras-project/oras/releases/download/v0.12.0/oras_0.12.0_linux_amd64.tar.gz
-          mkdir -p oras-install/
-          tar -zxf oras_0.12.0_*.tar.gz -C oras-install/
-          sudo mv oras-install/oras /usr/bin/
-          rm -rf oras_0.12.0_*.tar.gz oras-install/
       - name: Run push-pull tests
         run: |
             make push-pull
@@ -55,4 +46,4 @@ jobs:
             make bats-sync
       - name: Run scrub tests
         run: |
-            make bats-scrub
\ No newline at end of file
+            make bats-scrub
diff --git a/pkg/extensions/sync/sync_test.go b/pkg/extensions/sync/sync_test.go
index 1cb0a2df..847b5f3c 100644
--- a/pkg/extensions/sync/sync_test.go
+++ b/pkg/extensions/sync/sync_test.go
@@ -290,7 +290,7 @@ func TestORAS(t *testing.T) {
 
 		srcURL := strings.Join([]string{sctlr.Server.Addr, "/oras-artifact:v2"}, "")
 
-		cmd = exec.Command("oras", "push", srcURL, "--manifest-config",
+		cmd = exec.Command("oras", "push", "--plain-http", srcURL, "--manifest-config",
 			"config.json:application/vnd.acme.rocket.config.v1+json", "artifact.txt:text/plain", "-d", "-v")
 		cmd.Dir = fileDir
 
@@ -340,7 +340,7 @@ func TestORAS(t *testing.T) {
 		So(resp.StatusCode(), ShouldEqual, 200)
 
 		destURL := strings.Join([]string{dctlr.Server.Addr, "/oras-artifact:v2"}, "")
-		cmd = exec.Command("oras", "pull", destURL, "-d", "-v", "-a")
+		cmd = exec.Command("oras", "pull", "--plain-http", destURL, "-d", "-v")
 		destDir := t.TempDir()
 		cmd.Dir = destDir
 		// pulling oras artifact from dest server
diff --git a/test/blackbox/pushpull.bats b/test/blackbox/pushpull.bats
index 4802e051..8bfbcbc0 100644
--- a/test/blackbox/pushpull.bats
+++ b/test/blackbox/pushpull.bats
@@ -68,14 +68,14 @@ function teardown_file() {
 @test "push oras artifact" {
     echo "{\"name\":\"foo\",\"value\":\"bar\"}" > config.json
     echo "hello world" > artifact.txt
-    oras push 127.0.0.1:8080/hello-artifact:v2 \
+    oras push --plain-http 127.0.0.1:8080/hello-artifact:v2 \
         --manifest-config config.json:application/vnd.acme.rocket.config.v1+json artifact.txt:text/plain -d -v
 	rm -f artifact.txt
     rm -f config.json
 }
 
 @test "pull oras artifact" {
-    oras pull 127.0.0.1:8080/hello-artifact:v2 -d -v -a
+    oras pull --plain-http 127.0.0.1:8080/hello-artifact:v2 -d -v
     grep -q "hello world" artifact.txt
     rm -f artifact.txt
 }
diff --git a/test/blackbox/sync.bats b/test/blackbox/sync.bats
index a5802a4a..79d93141 100644
--- a/test/blackbox/sync.bats
+++ b/test/blackbox/sync.bats
@@ -40,7 +40,7 @@ function setup_file() {
                     ],
                     "onDemand": true,
                     "tlsVerify": false,
-                    "PollInterval": "30s",
+                    "PollInterval": "20s",
                     "content": [
                         {
                             "prefix": "**"