diff --git a/Dockerfile.test.dapper b/Dockerfile.test.dapper
index d3cc2eaca9..72dfe2bcfc 100644
--- a/Dockerfile.test.dapper
+++ b/Dockerfile.test.dapper
@@ -3,7 +3,7 @@ FROM ${GOLANG}
 
 RUN apk -U --no-cache add bash git gcc musl-dev docker curl jq coreutils python3 openssl py3-pip procps
 
-ENV SONOBUOY_VERSION 0.55.0
+ENV SONOBUOY_VERSION 0.56.4
 
 RUN OS=linux; \
     ARCH=$(go env GOARCH); \
diff --git a/conformance/Dockerfile b/conformance/Dockerfile
index efed370c75..566fdfe357 100644
--- a/conformance/Dockerfile
+++ b/conformance/Dockerfile
@@ -1,6 +1,6 @@
-FROM ubuntu:18.04
-RUN apt-get update && \
-    apt-get install -y curl
-RUN curl -sfL https://github.com/vmware-tanzu/sonobuoy/releases/download/v0.19.0/sonobuoy_0.19.0_linux_amd64.tar.gz | tar xvzf - -C /usr/bin
+FROM alpine:3.15
+ENV SONOBUOY_VERSION 0.56.4
+RUN apk add curl tar gzip
+RUN curl -sfL https://github.com/vmware-tanzu/sonobuoy/releases/download/v${SONOBUOY_VERSION}/sonobuoy_${SONOBUOY_VERSION}_linux_amd64.tar.gz | tar xvzf - -C /usr/bin
 COPY run-test.sh /usr/bin
 CMD ["/usr/bin/run-test.sh"]
diff --git a/conformance/run-test.sh b/conformance/run-test.sh
index b94c60b4a1..db5a265237 100755
--- a/conformance/run-test.sh
+++ b/conformance/run-test.sh
@@ -11,6 +11,6 @@ sed 's/localhost/server/g' /etc/rancher/k3s/k3s.yaml > /root/.kube/config
 export KUBECONFIG=/root/.kube/config
 cat /etc/rancher/k3s/k3s.yaml
 cat $KUBECONFIG
-sonobuoy run --sonobuoy-image=rancher/sonobuoy-sonobuoy:v0.19.0
+sonobuoy run --sonobuoy-image=rancher/sonobuoy-sonobuoy:v0.56.4
 sleep 15
 sonobuoy logs -f