diff --git a/Dockerfile b/Dockerfile
index 4719150..2f3bbbb 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.6.0
+FROM ruby:3.0.0
 
 RUN mkdir /app
 WORKDIR /app
diff --git a/Gemfile.lock b/Gemfile.lock
index bc03efb..0eca751 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -107,6 +107,8 @@ GEM
     nio4r (2.5.8)
     nokogiri (1.12.5-x86_64-darwin)
       racc (~> 1.4)
+    nokogiri (1.12.5-x86_64-linux)
+      racc (~> 1.4)
     parallel (1.21.0)
     parser (3.0.2.0)
       ast (~> 2.4.1)
@@ -224,6 +226,7 @@ GEM
 
 PLATFORMS
   x86_64-darwin-19
+  x86_64-linux
 
 DEPENDENCIES
   bootsnap (>= 1.4.2)
@@ -252,4 +255,4 @@ RUBY VERSION
    ruby 3.0.0p0
 
 BUNDLED WITH
-   2.2.30
+   2.2.3
diff --git a/docker-compose.yml b/docker-compose.yml
index 539b137..88c432b 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -4,6 +4,8 @@ services:
     image: postgres
     ports:
       - 5434:5432
+    environment:
+      POSTGRES_PASSWORD: password
   web:
     image: nginx
     volumes:
@@ -21,6 +23,6 @@ services:
     ports:
       - 3000:3000
     environment:
-      - DATABASE_URL=postgres://postgres@db
+      - DATABASE_URL=postgres://postgres:password@db
     links:
       - db