diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 03e2abd..1f76d23 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,16 +6,17 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [2.5, 2.6, 2.7]
+        ruby: [2.7, 3.0]
         gemfile:
-          - activemodel-5.2
           - activemodel-6.0
           - activemodel-6.1
+          - activemodel-7.0
           - activemodel-main
         include:
           - { ruby: "2.3", gemfile: "activemodel-3.2" }
-          - { ruby: "2.3", gemfile: "activemodel-4.2" }
           - { ruby: "2.4", gemfile: "activemodel-4.2" }
+          - { ruby: "2.5", gemfile: "activemodel-5.2" }
+          - { ruby: "2.6", gemfile: "activemodel-6.1" }
 
     env:
       BUNDLE_GEMFILE: gemfiles/${{ matrix.gemfile }}.gemfile
diff --git a/gemfiles/activemodel-7.0.gemfile b/gemfiles/activemodel-7.0.gemfile
new file mode 100644
index 0000000..4691b92
--- /dev/null
+++ b/gemfiles/activemodel-7.0.gemfile
@@ -0,0 +1,5 @@
+source "https://rubygems.org"
+
+gem "activemodel", "~> 7.0.0"
+
+gemspec path: "../"
diff --git a/strip_attributes.gemspec b/strip_attributes.gemspec
index 0ab48d9..72f012b 100644
--- a/strip_attributes.gemspec
+++ b/strip_attributes.gemspec
@@ -17,8 +17,8 @@ Gem::Specification.new do |spec|
   spec.test_files    = `git ls-files -- {test,spec}/*`.split("\n")
   spec.require_paths = ["lib"]
 
-  spec.add_runtime_dependency "activemodel", ">= 3.0", "< 7.0"
-  spec.add_development_dependency "active_attr", "~> 0.10"
+  spec.add_runtime_dependency "activemodel", ">= 3.0", "< 8.0"
+  spec.add_development_dependency "active_attr", "~> 0.15"
   spec.add_development_dependency "minitest", ">= 5.0", "< 6.0"
   spec.add_development_dependency "minitest-matchers_vaccine", "~> 1.0" unless ENV["SKIP_VACCINE"]
   spec.add_development_dependency "minitest-reporters", ">= 0.14.24"