diff --git a/testing/Dockerfile b/testing/Dockerfile
index 06297d6f5e..70b5bd8dca 100644
--- a/testing/Dockerfile
+++ b/testing/Dockerfile
@@ -16,7 +16,7 @@ RUN case $(uname -m) in x86_64|amd64) ARCH="amd64" ;; aarch64|arm64|armv7l) ARCH
 
 # Install conftest
 # renovate: datasource=github-releases depName=open-policy-agent/conftest
-ENV CONFTEST_VERSION=0.54.0
+ENV CONFTEST_VERSION=0.55.0
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 RUN case $(uname -m) in x86_64|amd64) ARCH="x86_64" ;; aarch64|arm64|armv7l) ARCH="arm64" ;; esac && \
     curl -LOs https://github.com/open-policy-agent/conftest/releases/download/v${CONFTEST_VERSION}/conftest_${CONFTEST_VERSION}_Linux_${ARCH}.tar.gz && \