diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 4bb929904..50f0725f4 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -162,7 +162,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/newrelic/newrelic-python-agent-ci:latest
+      image: ghcr.io/newrelic/newrelic-python-agent-ci@sha256:041b7abe6f515c82b4167d1eb380af56252a648c0e8d58c6581ea141c2fd8fd9
       options: >-
         --add-host=host.docker.internal:host-gateway
     timeout-minutes: 30
@@ -211,7 +211,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/newrelic/newrelic-python-agent-ci:latest
+      image: ghcr.io/newrelic/newrelic-python-agent-ci@sha256:041b7abe6f515c82b4167d1eb380af56252a648c0e8d58c6581ea141c2fd8fd9
       options: >-
         --add-host=host.docker.internal:host-gateway
     timeout-minutes: 30
@@ -260,7 +260,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/newrelic/newrelic-python-agent-ci:latest
+      image: ghcr.io/newrelic/newrelic-python-agent-ci@sha256:041b7abe6f515c82b4167d1eb380af56252a648c0e8d58c6581ea141c2fd8fd9
       options: >-
         --add-host=host.docker.internal:host-gateway
     timeout-minutes: 30
@@ -324,7 +324,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/newrelic/newrelic-python-agent-ci:latest
+      image: ghcr.io/newrelic/newrelic-python-agent-ci@sha256:041b7abe6f515c82b4167d1eb380af56252a648c0e8d58c6581ea141c2fd8fd9
       options: >-
         --add-host=host.docker.internal:host-gateway
     timeout-minutes: 30
@@ -388,7 +388,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/newrelic/newrelic-python-agent-ci:latest
+      image: ghcr.io/newrelic/newrelic-python-agent-ci@sha256:041b7abe6f515c82b4167d1eb380af56252a648c0e8d58c6581ea141c2fd8fd9
       options: >-
         --add-host=host.docker.internal:host-gateway
     timeout-minutes: 30
@@ -455,7 +455,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/newrelic/newrelic-python-agent-ci:latest
+      image: ghcr.io/newrelic/newrelic-python-agent-ci@sha256:041b7abe6f515c82b4167d1eb380af56252a648c0e8d58c6581ea141c2fd8fd9
       options: >-
         --add-host=host.docker.internal:host-gateway
     timeout-minutes: 30
@@ -522,7 +522,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/newrelic/newrelic-python-agent-ci:latest
+      image: ghcr.io/newrelic/newrelic-python-agent-ci@sha256:041b7abe6f515c82b4167d1eb380af56252a648c0e8d58c6581ea141c2fd8fd9
       options: >-
         --add-host=host.docker.internal:host-gateway
     timeout-minutes: 30
@@ -625,7 +625,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/newrelic/newrelic-python-agent-ci:latest
+      image: ghcr.io/newrelic/newrelic-python-agent-ci@sha256:041b7abe6f515c82b4167d1eb380af56252a648c0e8d58c6581ea141c2fd8fd9
       options: >-
         --add-host=host.docker.internal:host-gateway
     timeout-minutes: 30
@@ -687,7 +687,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/newrelic/newrelic-python-agent-ci:latest
+      image: ghcr.io/newrelic/newrelic-python-agent-ci@sha256:041b7abe6f515c82b4167d1eb380af56252a648c0e8d58c6581ea141c2fd8fd9
       options: >-
         --add-host=host.docker.internal:host-gateway
     timeout-minutes: 30
@@ -751,7 +751,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/newrelic/newrelic-python-agent-ci:latest
+      image: ghcr.io/newrelic/newrelic-python-agent-ci@sha256:041b7abe6f515c82b4167d1eb380af56252a648c0e8d58c6581ea141c2fd8fd9
       options: >-
         --add-host=host.docker.internal:host-gateway
     timeout-minutes: 30
@@ -813,7 +813,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/newrelic/newrelic-python-agent-ci:latest
+      image: ghcr.io/newrelic/newrelic-python-agent-ci@sha256:041b7abe6f515c82b4167d1eb380af56252a648c0e8d58c6581ea141c2fd8fd9
       options: >-
         --add-host=host.docker.internal:host-gateway
     timeout-minutes: 30
@@ -876,7 +876,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/newrelic/newrelic-python-agent-ci:latest
+      image: ghcr.io/newrelic/newrelic-python-agent-ci@sha256:041b7abe6f515c82b4167d1eb380af56252a648c0e8d58c6581ea141c2fd8fd9
       options: >-
         --add-host=host.docker.internal:host-gateway
     timeout-minutes: 30
@@ -950,7 +950,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/newrelic/newrelic-python-agent-ci:latest
+      image: ghcr.io/newrelic/newrelic-python-agent-ci@sha256:041b7abe6f515c82b4167d1eb380af56252a648c0e8d58c6581ea141c2fd8fd9
       options: >-
         --add-host=host.docker.internal:host-gateway
     timeout-minutes: 30
@@ -1012,7 +1012,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/newrelic/newrelic-python-agent-ci:latest
+      image: ghcr.io/newrelic/newrelic-python-agent-ci@sha256:041b7abe6f515c82b4167d1eb380af56252a648c0e8d58c6581ea141c2fd8fd9
       options: >-
         --add-host=host.docker.internal:host-gateway
     timeout-minutes: 30
@@ -1076,7 +1076,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/newrelic/newrelic-python-agent-ci:latest
+      image: ghcr.io/newrelic/newrelic-python-agent-ci@sha256:041b7abe6f515c82b4167d1eb380af56252a648c0e8d58c6581ea141c2fd8fd9
       options: >-
         --add-host=host.docker.internal:host-gateway
     timeout-minutes: 30
@@ -1141,7 +1141,7 @@ jobs:
 
     runs-on: ubuntu-latest
     container:
-      image: ghcr.io/newrelic/newrelic-python-agent-ci:latest
+      image: ghcr.io/newrelic/newrelic-python-agent-ci@sha256:041b7abe6f515c82b4167d1eb380af56252a648c0e8d58c6581ea141c2fd8fd9
       options: >-
         --add-host=host.docker.internal:host-gateway
     timeout-minutes: 30