diff --git a/ci/gha-runner-image/Dockerfile b/ci/gha-runner-image/Dockerfile
index 8eb3555..bedb3b3 100644
--- a/ci/gha-runner-image/Dockerfile
+++ b/ci/gha-runner-image/Dockerfile
@@ -11,6 +11,9 @@ RUN apt-get install -y --no-install-recommends dirmngr
 RUN apt-get install -y --no-install-recommends wget
 RUN apt-get install -y --no-install-recommends gnupg
 RUN apt-get install -y --no-install-recommends python3-pip
+RUN apt-get install -y --no-install-recommends locales && \
+    locale-gen en_US
+