diff --git a/docker/studip/Dockerfile b/docker/studip/Dockerfile
index fe9fc8cb0861888914b6d016d091645a97753725..92eb5b533652e8ba97fa64d08891ef10612f5efa 100644
--- a/docker/studip/Dockerfile
+++ b/docker/studip/Dockerfile
@@ -12,9 +12,15 @@ RUN apt update && apt install -y --no-install-recommends \
         libzip-dev \
         libicu-dev \
         libwebp-dev \
+        locales \
         vim \
     && rm -rf /var/lib/apt/lists/*
 
+# Install locales
+RUN sed -i -e 's/# en_GB.UTF-8 UTF-8/en_GB.UTF-8 UTF-8/' /etc/locale.gen \
+    && dpkg-reconfigure --frontend=noninteractive locales \
+    && update-locale
+
 # Install php extensions
 RUN docker-php-ext-configure gd --with-jpeg --with-webp
 RUN docker-php-ext-install gettext gd zip pdo_mysql mysqli intl
diff --git a/docker/studip/Dockerfile-Dev b/docker/studip/Dockerfile-Dev
index 112825a88581fecc79831678750b32d4ffaa6cb1..3c2b2c5b2230a6242af0d1da3d899bbc9f971af1 100644
--- a/docker/studip/Dockerfile-Dev
+++ b/docker/studip/Dockerfile-Dev
@@ -12,9 +12,15 @@ RUN apt update && apt install -y --no-install-recommends \
         libzip-dev \
         libicu-dev \
         libwebp-dev \
+        locales \
         vim \
     && rm -rf /var/lib/apt/lists/*
 
+# Install locales
+RUN sed -i -e 's/# en_GB.UTF-8 UTF-8/en_GB.UTF-8 UTF-8/' /etc/locale.gen \
+    && dpkg-reconfigure --frontend=noninteractive locales \
+    && update-locale
+
 # Install php extensions
 RUN docker-php-ext-configure gd --with-jpeg --with-webp
 RUN docker-php-ext-install pdo gettext curl gd mbstring zip pdo pdo_mysql mysqli intl json