diff --git a/Dockerfile b/Dockerfile
index 1705370..f76d0c2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,7 +9,7 @@ RUN apk update \
 COPY pathfinder /app
 WORKDIR /app
 
-RUN composer self-update 1.6.3
+RUN composer self-update 2.1.8
 RUN composer install
 
 FROM trafex/alpine-nginx-php7:ba1dd422
diff --git a/development/Dockerfile.development b/development/Dockerfile.development
index 090f40f..8fe1dd6 100644
--- a/development/Dockerfile.development
+++ b/development/Dockerfile.development
@@ -9,7 +9,7 @@ RUN apk update \
 COPY pathfinder /app
 WORKDIR /app
 
-RUN composer self-update 1.6.3
+RUN composer self-update 2.1.8
 RUN composer install
 
 FROM trafex/alpine-nginx-php7:ba1dd422