diff --git a/config/docker-compose-common-services.yaml b/config/docker-compose-common-services.yaml
index c39cb92..db8e6d0 100644
--- a/config/docker-compose-common-services.yaml
+++ b/config/docker-compose-common-services.yaml
@@ -4,7 +4,7 @@ services:
 
   cloud-agent:
     container_name: cloud-agent
-    image: index.docker.io/sourcegraph/src-tunnel-agent:2024-02-15-04-02-110c2ea9
+    image: index.docker.io/sourcegraph/src-tunnel-agent:2024-02-15-04-02-110c2ea9@sha256:54f3590b4cfd0ad24b0506d44e2dea1df0d777d66792668d4ba88e348cf731f9
     volumes:
       - ../config/cloud-agent-service-account-key.json:/sourcegraph/cloud-agent-service-account-key.json:ro
       - ../config/cloud-agent-config.yaml:/sourcegraph/cloud-agent-config.yaml:ro
@@ -16,7 +16,7 @@ services:
   src-serve-git:
     # Uses a valid hostname as container_name, to trick the cloud agent and code host config into finding this container on the Docker network
     container_name: src-serve-git-ubuntu.local
-    image:  index.docker.io/sourcegraph/src-cli:latest
+    image:  index.docker.io/sourcegraph/src-cli:latest@sha256:f45c2bf682b2f6b9bf2410e7da1e9a9329219a637a65b94de417a20b0885e4dd
     volumes:
       - ../src-serve-root/:/sourcegraph/src-serve-root:ro
     command: "serve-git -addr :443 /sourcegraph/src-serve-root"
diff --git a/repo-converter/build/Dockerfile b/repo-converter/build/Dockerfile
index 1ea2d53..94935c1 100644
--- a/repo-converter/build/Dockerfile
+++ b/repo-converter/build/Dockerfile
@@ -1,11 +1,11 @@
-# syntax=docker/dockerfile:1
+# syntax=docker/dockerfile:1@sha256:865e5dd094beca432e8c0a1d5e1c465db5f998dca4e439981029b3b81fb39ed5
 # Using version:1 means always getting the latest version of dockerfile syntax within major version 1
 # https://docs.docker.com/build/dockerfile/frontend/#stable-channel
 # version:1 is still the most popular version
 # https://sourcegraph.com/search?q=context:global+%23+syntax%3Ddocker/dockerfile:(.*)&patternType=regexp&sm=0&expanded=&groupBy=group
 
 # Using Ubuntu LTS
-FROM ubuntu:22.04 as base
+FROM ubuntu:22.04@sha256:0e5e4a57c2499249aafc3b40fcd541e9a456aab7296681a3994d631587203f97 as base
 
 # Avoid stuck build due to user prompt
 ARG DEBIAN_FRONTEND=noninteractive
diff --git a/repo-converter/docker-compose.yaml b/repo-converter/docker-compose.yaml
index 9271e38..90aaf3f 100644
--- a/repo-converter/docker-compose.yaml
+++ b/repo-converter/docker-compose.yaml
@@ -9,7 +9,7 @@ services:
 
   repo-converter:
     container_name: repo-converter
-    image: ghcr.io/sourcegraph/implementation-bridge-repo-converter:latest
+    image: ghcr.io/sourcegraph/implementation-bridge-repo-converter:latest@sha256:5acfe53120ac4b34a7043c615998337e9e5b3cb94e89eca4faf45ed754b4c488
     volumes:
       - ../config/repos-to-convert.yaml:/sourcegraph/repos-to-convert.yaml:ro
       - ../config/toprc:/root/.config/procps/toprc