diff --git a/ci/docker/Dockerfile-nighthawk b/ci/docker/Dockerfile-nighthawk
index a2c681afa..153113e8b 100644
--- a/ci/docker/Dockerfile-nighthawk
+++ b/ci/docker/Dockerfile-nighthawk
@@ -1,4 +1,4 @@
-FROM frolvlad/alpine-glibc
+FROM frolvlad/alpine-glibc:alpine-3.13_glibc-2.32
 
 ADD nighthawk_client /usr/local/bin/nighthawk_client
 ADD nighthawk_test_server /usr/local/bin/nighthawk_test_server
diff --git a/ci/docker/Dockerfile-nighthawk-benchmark b/ci/docker/Dockerfile-nighthawk-benchmark
index cdc1f07e6..5430784f4 100644
--- a/ci/docker/Dockerfile-nighthawk-benchmark
+++ b/ci/docker/Dockerfile-nighthawk-benchmark
@@ -1,4 +1,4 @@
-FROM frolvlad/alpine-glibc
+FROM frolvlad/alpine-glibc:alpine-3.13_glibc-2.32
 
 CMD ["./benchmarks" "--help"]
 ENV RUNFILES_DIR=/usr/local/bin/benchmarks/benchmarks.runfiles
@@ -8,7 +8,7 @@ WORKDIR /usr/local/bin/benchmarks
 
 COPY benchmarks /usr/local/bin/benchmarks/
 
-RUN apk add --no-cache docker=20.10.2-r0 openrc=0.42.1-r19 python3>=3.8.5
+RUN apk add --no-cache docker=20.10.3-r0 openrc=0.42.1-r19 python3=3.8.7-r0
 RUN rc-update add docker boot
 
 RUN if [ ! -e /usr/bin/python ]; then ln -sf python3 /usr/bin/python; fi && \