diff --git a/7.4/Dockerfile b/7.4/Dockerfile
index f6307a1..33013e6 100644
--- a/7.4/Dockerfile
+++ b/7.4/Dockerfile
@@ -27,6 +27,7 @@ RUN apt install -y \
     unzip \
     libpng-dev \
     zlib1g-dev \
+    libgmp-dev \
     && docker-php-ext-configure gd \
     && docker-php-ext-install -j$(nproc) gd \
     && docker-php-ext-install pdo_mysql \