diff --git a/Dockerfile b/Dockerfile
index a7ccfc0..7b73010 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,5 +14,5 @@ FROM nextcloud:17
 
 # Mandatory for bookmark extension
 RUN apt-get update \
- && apt-get install -y php-gmp
+ && apt-get install -y php7.3-gmp