diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index a24f4d52..ffb31d80 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -33,6 +33,8 @@ jobs:
           - rails_7_2
           - rails_7_1
           - rails_7_0
+          - dalli5
+          - dalli4
           - dalli3
           - redis_5
           - redis_4
@@ -67,6 +69,18 @@ jobs:
             ruby: '3.0'
           - gemfile: active_support_8_0_redis_cache_store
             ruby: '2.7'
+          - gemfile: dalli5
+            ruby: '3.2'
+          - gemfile: dalli5
+            ruby: '3.1'
+          - gemfile: dalli5
+            ruby: '3.0'
+          - gemfile: dalli5
+            ruby: '2.7'
+          - gemfile: dalli4
+            ruby: '3.0'
+          - gemfile: dalli4
+            ruby: '2.7'
           - gemfile: rails_8_1
             ruby: '3.1'
           - gemfile: rails_8_1
diff --git a/Appraisals b/Appraisals
index 9ca0281a..e5fbcf26 100644
--- a/Appraisals
+++ b/Appraisals
@@ -28,6 +28,14 @@ appraise "rails_7-0" do
   gem "railties", "~> 7.0.0"
 end
 
+appraise "dalli5" do
+  gem "dalli", "~> 5.0"
+end
+
+appraise "dalli4" do
+  gem "dalli", "~> 4.0"
+end
+
 appraise "dalli3" do
   gem "dalli", "~> 3.0"
 end
diff --git a/gemfiles/dalli4.gemfile b/gemfiles/dalli4.gemfile
new file mode 100644
index 00000000..ab4d6d2d
--- /dev/null
+++ b/gemfiles/dalli4.gemfile
@@ -0,0 +1,12 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "dalli", "~> 4.0"
+
+group :maintenance, optional: true do
+  gem "bake"
+  gem "bake-gem"
+end
+
+gemspec path: "../"
diff --git a/gemfiles/dalli5.gemfile b/gemfiles/dalli5.gemfile
new file mode 100644
index 00000000..03d77b99
--- /dev/null
+++ b/gemfiles/dalli5.gemfile
@@ -0,0 +1,12 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "dalli", "~> 5.0"
+
+group :maintenance, optional: true do
+  gem "bake"
+  gem "bake-gem"
+end
+
+gemspec path: "../"
diff --git a/lib/rack/attack/store_proxy/dalli_proxy.rb b/lib/rack/attack/store_proxy/dalli_proxy.rb
index 48198bb2..fa1c59c6 100644
--- a/lib/rack/attack/store_proxy/dalli_proxy.rb
+++ b/lib/rack/attack/store_proxy/dalli_proxy.rb
@@ -34,7 +34,7 @@ def read(key)
         def write(key, value, options = {})
           rescuing do
             with do |client|
-              client.set(key, value, options.fetch(:expires_in, 0), raw: true)
+              client.set(key, value.to_s, options.fetch(:expires_in, 0), raw: true)
             end
           end
         end