diff --git a/.clusterfuzzlite/Dockerfile b/.clusterfuzzlite/Dockerfile
index 9a06f68..a255dab 100644
--- a/.clusterfuzzlite/Dockerfile
+++ b/.clusterfuzzlite/Dockerfile
@@ -1,7 +1,7 @@
 # Build environment for ClusterFuzzLite. base-builder-python provides atheris,
 # the libFuzzer engine, and compile_python_fuzzer. Pinned by digest for a
 # reproducible, supply-chain-safe build; Renovate keeps it current.
-FROM gcr.io/oss-fuzz-base/base-builder-python:latest@sha256:171eebccc7906dc0b1d944aa716587f45db79cdb2d75d6287947860ba16b66b7
+FROM gcr.io/oss-fuzz-base/base-builder-python:latest@sha256:6b2b3a7e4a2da50de47f94925cffbe34747e1aae4f33d7f07ba6c681dd648b23
 
 # Probatio is pure Python with no native extension, so nothing is compiled here;
 # build.sh installs the package and compiles each atheris harness.