diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2cdc04c..dfd3ed5 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -163,7 +163,7 @@ performance_tests_dev:
     DEV_URL: "https://dev.libravatar.org"
   before_script:
     - apk add --no-cache curl
-    - pip install requests Pillow prettytable pyLibravatar
+    - pip install requests Pillow prettytable pyLibravatar dnspython py3dns
   script:
     - echo "Running performance tests against dev.libravatar.org..."
     - python3 scripts/performance_tests.py --base-url $DEV_URL --concurrent-users 5 --output performance_dev.json
@@ -187,7 +187,7 @@ performance_tests_prod:
     PROD_URL: "https://libravatar.org"
   before_script:
     - apk add --no-cache curl
-    - pip install requests Pillow prettytable pyLibravatar
+    - pip install requests Pillow prettytable pyLibravatar dnspython py3dns
   script:
     - echo "Running performance tests against libravatar.org..."
     - python3 scripts/performance_tests.py --base-url $PROD_URL --concurrent-users 3 --output performance_prod.json
@@ -211,7 +211,7 @@ performance_tests_prod_manual:
     PROD_URL: "https://libravatar.org"
   before_script:
     - apk add --no-cache curl
-    - pip install requests
+    - pip install requests Pillow prettytable pyLibravatar dnspython py3dns
   script:
     - echo "Running manual performance tests against libravatar.org..."
     - python3 scripts/performance_tests.py --base-url $PROD_URL --concurrent-users 5 --output performance_prod_manual.json