diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index da3c9ff..51a72dd 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -53,7 +53,7 @@ jobs:
           key: archives-ubuntu-${{hashFiles('ext/re2/extconf.rb')}}
       - run: |
           docker run --rm -v "$(pwd):/re2" -w /re2 \
-            "ghcr.io/rake-compiler/rake-compiler-dock-image:1.4.0.rc2-mri-${{matrix.platform}}" \
+            "ghcr.io/rake-compiler/rake-compiler-dock-image:1.4.0-mri-${{matrix.platform}}" \
             ./scripts/test-gem-build gems ${{matrix.platform}} ${{github.ref_type}}
       - uses: actions/upload-artifact@v4
         with:
diff --git a/re2.gemspec b/re2.gemspec
index 0f339c2..c2e2b27 100644
--- a/re2.gemspec
+++ b/re2.gemspec
@@ -39,7 +39,7 @@ Gem::Specification.new do |s|
     "spec/re2/scanner_spec.rb"
   ]
   s.add_development_dependency("rake-compiler", "~> 1.2.5")
-  s.add_development_dependency("rake-compiler-dock", "~> 1.4.0.rc2")
+  s.add_development_dependency("rake-compiler-dock", "~> 1.4.0")
   s.add_development_dependency("rspec", "~> 3.2")
   s.add_runtime_dependency("mini_portile2", "~> 2.8.5") # keep version in sync with extconf.rb
 end