diff --git a/Dockerfile.bullseye b/Dockerfile.bullseye
index f7cd049813358e11ee084583e12c20bafbab0fe5..df97773b7e57f1bc8d7cf7363e940aeb39b1b7e8 100644
--- a/Dockerfile.bullseye
+++ b/Dockerfile.bullseye
@@ -7,7 +7,7 @@ RUN apt-get -qq update && \
         sqlite3 locales-all git \
         python3 python3-venv python3-coverage python3-ldap3 python3-flask python3-flask-sqlalchemy python3-flask-migrate \
         python3-pip python3-qrcode python3-fido2 python3-oauthlib python3-flask-babel python3-argon2 python3-pytest python3-all python3-pip \
-        git-buildpackage debhelper dh-python mariadb-server python3-mysqldb python3-requests-oauthlib python3-git libffi-dev && \
+        git-buildpackage debhelper dh-python mariadb-server python3-mysqldb python3-requests-oauthlib python3-git python3-prometheus-client libffi-dev && \
     pip3 install pylint html5validator twine build --upgrade && \
     apt-get -qq clean
 
diff --git a/Dockerfile.buster b/Dockerfile.buster
index bed7fb622b625ae7f7a06f4d58d30165bd5e2b5e..1df0f1ece9b2ce944478ac00a70fba770dba466d 100644
--- a/Dockerfile.buster
+++ b/Dockerfile.buster
@@ -7,7 +7,7 @@ RUN apt-get -qq update && \
         sqlite3 locales-all git \
         python3 python3-venv python3-coverage python3-ldap3 python3-flask python3-flask-sqlalchemy python3-flask-migrate \
         python3-pip python3-qrcode python3-fido2 python3-oauthlib python3-flask-babel python3-argon2 python3-pytest python3-all python3-pip \
-        git-buildpackage debhelper dh-python mariadb-server python3-mysqldb python3-flask-oauthlib python3-requests-oauthlib python3-git libffi-dev && \
+        git-buildpackage debhelper dh-python mariadb-server python3-mysqldb python3-flask-oauthlib python3-requests-oauthlib python3-git python3-prometheus-client libffi-dev && \
     pip3 install pylint html5validator twine build --upgrade && \
     apt-get -qq clean