diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index eabf505..a669c03 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -19,7 +19,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ["3.1", "3.2", "3.3", "3.4", "4.0"]
+        ruby: ["3.2", "3.3", "3.4", "4.0"]
     steps:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
diff --git a/.standard.yml b/.standard.yml
index d41defb..67be296 100644
--- a/.standard.yml
+++ b/.standard.yml
@@ -1,6 +1,6 @@
 # For available configuration options, see:
 #   https://github.com/standardrb/standard
-ruby_version: 3.0
+ruby_version: 3.2
 
 ignore:
   - 'pkg/**/*'
diff --git a/CHANGELOG.md b/CHANGELOG.md
index dbddda9..9f7a0d1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,5 @@
 ## [Unreleased]
+- Drop support for Ruby 3.1, which reached end-of-life on 2025-03-31. The gem now requires Ruby >= 3.2.
 
 ## [0.7.0] - 2025-04-12
 - Added a new (and better) way to organize your project with _tailwind.css and styles.tailwindcss files [#26](https://github.com/vormwald/jekyll-tailwindcss/pull/26) 
diff --git a/Gemfile b/Gemfile
index b0b6d95..cfce334 100644
--- a/Gemfile
+++ b/Gemfile
@@ -15,12 +15,6 @@ gem "csv"
 gem "logger"
 gem "base64"
 
-# transitive deps whose newer releases require ruby >= 3.2; CI still tests ruby 3.1
-gem "rdoc", "< 8" # rdoc 8 requires ruby >= 3.2 and pulls in rbs (also >= 3.2)
-gem "erb", "< 5" # erb >= 6 requires ruby >= 3.2
-gem "sass-embedded", "< 1.77.1" # sass-embedded >= 1.77.1 requires ruby >= 3.2
-gem "google-protobuf", "< 4.36" # google-protobuf >= 4.36 requires ruby >= 3.2
-
 group :development, :test do
   gem "irb", "~> 1.14"
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index c91ec0d..2205f41 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -12,29 +12,26 @@ GEM
     ast (2.4.2)
     base64 (0.2.0)
     bigdecimal (4.1.2)
-    cgi (0.5.2)
     colorator (1.1.0)
     concurrent-ruby (1.3.5)
     csv (3.3.2)
-    date (3.5.1)
     diff-lcs (1.5.1)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
-    erb (4.0.4.1)
-      cgi (>= 0.3.3)
+    erb (6.0.7)
     eventmachine (1.2.7)
     ffi (1.17.4)
     ffi (1.17.4-arm64-darwin)
     ffi (1.17.4-x86_64-linux-gnu)
     forwardable-extended (2.6.0)
-    google-protobuf (4.35.1)
+    google-protobuf (4.36.0)
       bigdecimal
       rake (~> 13.3)
-    google-protobuf (4.35.1-arm64-darwin)
+    google-protobuf (4.36.0-arm64-darwin)
       bigdecimal
       rake (~> 13.3)
-    google-protobuf (4.35.1-x86_64-linux-gnu)
+    google-protobuf (4.36.0-x86_64-linux-gnu)
       bigdecimal
       rake (~> 13.3)
     http_parser.rb (0.8.0)
@@ -92,9 +89,6 @@ GEM
       prettyprint
     prettyprint (0.2.0)
     prism (1.9.0)
-    psych (5.4.0)
-      date
-      stringio
     public_suffix (6.0.1)
     racc (1.8.1)
     rainbow (3.1.1)
@@ -102,9 +96,14 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rdoc (7.2.0)
+    rbs (4.1.3)
+      logger
+      prism (>= 1.6.0)
+      tsort
+    rdoc (8.0.0)
       erb
-      psych (>= 4.0.0)
+      prism (>= 1.6.0)
+      rbs (>= 4.0.0)
       tsort
     regexp_parser (2.10.0)
     reline (0.7.0)
@@ -141,13 +140,13 @@ GEM
       rubocop-ast (>= 1.31.1, < 2.0)
     ruby-progressbar (1.13.0)
     safe_yaml (1.0.5)
-    sass-embedded (1.77.0)
-      google-protobuf (>= 3.25, < 5.0)
-      rake (>= 13.0.0)
-    sass-embedded (1.77.0-arm64-darwin)
-      google-protobuf (>= 3.25, < 5.0)
-    sass-embedded (1.77.0-x86_64-linux-gnu)
-      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.103.1)
+      google-protobuf (~> 4.31)
+      rake (>= 13)
+    sass-embedded (1.103.1-arm64-darwin)
+      google-protobuf (~> 4.31)
+    sass-embedded (1.103.1-x86_64-linux-gnu)
+      google-protobuf (~> 4.31)
     standard (1.44.0)
       language_server-protocol (~> 3.17.0.2)
       lint_roller (~> 1.0)
@@ -160,7 +159,6 @@ GEM
     standard-performance (1.6.0)
       lint_roller (~> 1.1)
       rubocop-performance (~> 1.23.0)
-    stringio (3.2.0)
     tailwindcss-ruby (4.0.6)
     tailwindcss-ruby (4.0.6-arm64-darwin)
     tailwindcss-ruby (4.0.6-x86_64-linux-gnu)
@@ -178,16 +176,12 @@ PLATFORMS
 DEPENDENCIES
   base64
   csv
-  erb (< 5)
-  google-protobuf (< 4.36)
   irb (~> 1.14)
   jekyll (~> 4.3)
   jekyll-tailwindcss!
   logger
   rake (~> 13.0)
-  rdoc (< 8)
   rspec (~> 3.0)
-  sass-embedded (< 1.77.1)
   standard (~> 1.3)
 
 BUNDLED WITH
diff --git a/jekyll-tailwindcss.gemspec b/jekyll-tailwindcss.gemspec
index a5b15ce..bc091e5 100644
--- a/jekyll-tailwindcss.gemspec
+++ b/jekyll-tailwindcss.gemspec
@@ -10,7 +10,7 @@ Gem::Specification.new do |spec|
   spec.summary = "Integrate Tailwind CSS into your Jekyll site."
   spec.homepage = "https://github.com/vormwald/jekyll-tailwindcss"
   spec.license = "MIT"
-  spec.required_ruby_version = ">= 3.1.0"
+  spec.required_ruby_version = ">= 3.2.0"
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["changelog_uri"] = "https://github.com/vormwald/jekyll-tailwindcss/blob/main/CHANGELOG.md"
   spec.metadata["source_code_uri"] = "https://github.com/vormwald/jekyll-tailwindcss"