diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 41123f98..d3903d01 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -70,6 +70,7 @@ jobs:
         with:
           test-name: basic-ipv4
           pwru-pcap-filter: 'dst host 1.0.0.1 and port 8080'
+          pwru-flags: --backend=kprobe
           traffic-setup: |
             iptables -I OUTPUT 1 -m tcp --proto tcp --dst 1.0.0.1/32 --dport 8080 -j DROP
             curl -vvv -sS --fail --connect-timeout "1" -o /dev/null http://1.0.0.1:8080 || true
@@ -80,6 +81,7 @@ jobs:
         with:
           test-name: basic-ipv6
           pwru-pcap-filter: 'dst host 2606:4700:4700::1001 and port 8080'
+          pwru-flags: --backend=kprobe
           traffic-setup: |
             ip6tables -I OUTPUT 1 -m tcp --proto tcp --dst 2606:4700:4700::1001 --dport 8080 -j DROP
             curl -vvv -sS --fail --connect-timeout "1" -o /dev/null http://[2606:4700:4700::1001]:8080 || true
@@ -90,6 +92,7 @@ jobs:
         with:
           test-name: advanced-ipv4
           pwru-pcap-filter: 'tcp[tcpflags] = tcp-syn'
+          pwru-flags: --backend=kprobe
           traffic-setup: |
             iptables -I OUTPUT 1 -m tcp --proto tcp --dst 1.0.0.2/32 --dport 8080 -j DROP
             curl -vvv -sS --fail --connect-timeout "1" -o /dev/null http://1.0.0.2:8080 || true
@@ -100,6 +103,7 @@ jobs:
         with:
           test-name: advanced-ipv6
           pwru-pcap-filter: 'ip6[53] & 0x3f = 0x2'
+          pwru-flags: --backend=kprobe
           traffic-setup: |
             ip6tables -I OUTPUT 1 -m tcp --proto tcp --dst 2606:4700:4700::1002 --dport 8080 -j DROP
             curl -vvv -sS --fail --connect-timeout "1" -o /dev/null http://[2606:4700:4700::1002]:8080 || true
@@ -110,6 +114,7 @@ jobs:
         with:
           test-name: pcap-filter-stack
           pwru-pcap-filter: '(((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)'
+          pwru-flags: --backend=kprobe
           traffic-setup: curl -vvv -sS --fail --connect-timeout "1" -o /dev/null http://1.1.1.1 || true
           expected-output-pattern: '1.1.1.1:80'
 
@@ -117,7 +122,7 @@ jobs:
         uses: ./.github/actions/pwru-test
         with:
           test-name: filter-track-skb
-          pwru-flags: --filter-track-skb
+          pwru-flags: --filter-track-skb --backend=kprobe
           pwru-pcap-filter: dst host 10.10.20.99
           traffic-setup: |
             iptables -t nat -I OUTPUT 1 -d 10.10.20.99/32 -j DNAT --to-destination 10.10.14.2
@@ -129,6 +134,7 @@ jobs:
         with:
           test-name: filter-arp
           pwru-pcap-filter: 'arp and arp[7] = 1 and arp[24]= 169 and arp[25] = 254 and arp[26] = 0 and arp[27] = 1'
+          pwru-flags: --backend=kprobe
           traffic-setup: |
             ip net a pwru
             ip l a pwru-veth type veth peer name pwru-veth-peer
@@ -147,7 +153,7 @@ jobs:
         uses: ./.github/actions/pwru-test
         with:
           test-name: filter-ifname
-          pwru-flags: --filter-ifname lo
+          pwru-flags: --filter-ifname lo --backend=kprobe
           pwru-pcap-filter: icmp
           traffic-setup: |
             ping -W1 -c1 127.0.0.1 || true