diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 116b439f1..6d4c1a2af 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -25,6 +25,6 @@ RUN curl https://packages.microsoft.com/keys/microsoft.asc | sudo tee /etc/apt/t
 RUN mkdir -p /tmp/activerecord-sqlserver-adapter
 COPY Gemfile VERSION activerecord-sqlserver-adapter.gemspec /tmp/activerecord-sqlserver-adapter/
 RUN cd /tmp/activerecord-sqlserver-adapter \
-    && bundle install \
+    && RAILS_BRANCH=main bundle install \
     && rm -rf /tmp/activerecord-sqlserver-adapter
 RUN chown -R vscode:vscode /usr/local/rvm
diff --git a/activerecord-sqlserver-adapter.gemspec b/activerecord-sqlserver-adapter.gemspec
index 4348bed4a..1ef711091 100644
--- a/activerecord-sqlserver-adapter.gemspec
+++ b/activerecord-sqlserver-adapter.gemspec
@@ -27,6 +27,6 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.add_dependency "activerecord", "~> 8.0.0"
+  spec.add_dependency "activerecord", "~> 8.0.0.alpha"
   spec.add_dependency "tiny_tds"
 end