diff --git a/tests/dockerfiles/Dockerfile.alpine b/tests/dockerfiles/Dockerfile.alpine
index f7ce2abcf..5f2363058 100644
--- a/tests/dockerfiles/Dockerfile.alpine
+++ b/tests/dockerfiles/Dockerfile.alpine
@@ -96,6 +96,10 @@ RUN set -eux; \
 		openssl-dev \
 		readline-dev \
 		sqlite-dev \
+        libffi-dev \
+        gmp-dev \
+        icu-dev \
+        libzip-dev \
 	; \
 	\
 # make sure musl's iconv doesn't get used (https://www.php.net/manual/en/intro.iconv.php)
diff --git a/tests/dockerfiles/php.ini b/tests/dockerfiles/php.ini
index e058ed12d..9df8c4af3 100644
--- a/tests/dockerfiles/php.ini
+++ b/tests/dockerfiles/php.ini
@@ -5,6 +5,8 @@ display_startup_errors = On
 
 ffi.enable=true
 
+zend_extension=opcache
+
 [opcache]
 opcache.memory_consumption=256M
 opcache.enable=1