diff --git a/bin/ruby-build b/bin/ruby-build
index 004225a4..bcd505d2 100755
--- a/bin/ruby-build
+++ b/bin/ruby-build
@@ -18,7 +18,7 @@
 #   -6, --ipv6      Resolve names to IPv6 addresses only
 #
 
-RUBY_BUILD_VERSION="20260501"
+RUBY_BUILD_VERSION="20260512"
 
 OLDIFS="$IFS"
 
@@ -1420,6 +1420,10 @@ resolve_version() {
 
   # Look for an exact match first.
   for DEFINITION_DIR in "${RUBY_BUILD_DEFINITIONS[@]}"; do
+    if [ -f "${DEFINITION_DIR}/$1" ]; then
+      echo "$1"
+      return 0
+    fi
     if [ -f "${DEFINITION_DIR}/${version}" ]; then
       echo "$version"
       return 0
diff --git a/share/man/man1/ruby-build.1 b/share/man/man1/ruby-build.1
index 000464e7..a215747d 100644
--- a/share/man/man1/ruby-build.1
+++ b/share/man/man1/ruby-build.1
@@ -2,12 +2,12 @@
 .\"     Title: ruby-build
 .\"    Author: Mislav Marohnić
 .\" Generator: Asciidoctor 2.0.26
-.\"      Date: 2026-05-01
+.\"      Date: 2026-05-07
 .\"    Manual: ruby-build Manual
-.\"    Source: ruby-build 20260501
+.\"    Source: ruby-build 20260512
 .\"  Language: English
 .\"
-.TH "RUBY\-BUILD" "1" "2026-05-01" "ruby\-build 20260501" "ruby\-build Manual"
+.TH "RUBY\-BUILD" "1" "2026-05-07" "ruby\-build 20260512" "ruby\-build Manual"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
diff --git a/share/ruby-build/4.0.4 b/share/ruby-build/4.0.4
new file mode 100644
index 00000000..33de3159
--- /dev/null
+++ b/share/ruby-build/4.0.4
@@ -0,0 +1,2 @@
+install_package "openssl-3.0.20" "https://github.com/openssl/openssl/releases/download/openssl-3.0.20/openssl-3.0.20.tar.gz#c80a01dfc70ece4dc21168932c37739042d404d46ccc81a5986dd75314ecda6f" openssl --if needs_openssl:1.1.1-3.x.x
+install_package "ruby-4.0.4" "https://cache.ruby-lang.org/pub/ruby/4.0/ruby-4.0.4.tar.gz#f35f6edfa3dabb3f723f9d0cf1906c6512ae77f4e412ab1e68cc6e91d230fa80" enable_shared standard
diff --git a/test/definitions.bats b/test/definitions.bats
index c507d79b..5bd7283b 100644
--- a/test/definitions.bats
+++ b/test/definitions.bats
@@ -113,6 +113,16 @@ NUM_DEFINITIONS="$(ls "$BATS_TEST_DIRNAME"/../share/ruby-build | wc -l)"
   assert_success "3.2.1"
 }
 
+@test "resolve definition by exact match for ruby-prefixed name" {
+  export RUBY_BUILD_DEFINITIONS="${TMP}/definitions"
+  mkdir -p "${TMP}/definitions"
+
+  touch "${TMP}/definitions/ruby-dev"
+
+  run bin/ruby-build --resolve "ruby-dev"
+  assert_success "ruby-dev"
+}
+
 @test "resolve definition with ruby prefix" {
   export RUBY_BUILD_DEFINITIONS="${TMP}/definitions"
   mkdir -p "${TMP}/definitions"