diff --git a/problems/1108-defanging-an-ip-address/main.rb b/problems/1108-defanging-an-ip-address/main.rb
new file mode 100644
index 0000000..f3c0532
--- /dev/null
+++ b/problems/1108-defanging-an-ip-address/main.rb
@@ -0,0 +1,6 @@
+# @param {String} address
+# @return {String}
+def defang_i_paddr(address)
+    new_addr = address.gsub(".", "[.]")
+    return new_addr
+end
diff --git a/problems/1108-defanging-an-ip-address/test.rb b/problems/1108-defanging-an-ip-address/test.rb
new file mode 100644
index 0000000..1447087
--- /dev/null
+++ b/problems/1108-defanging-an-ip-address/test.rb
@@ -0,0 +1,11 @@
+require_relative "main"
+require "test/unit"
+ 
+class TestDefangIpAddr < Test::Unit::TestCase
+ 
+  def test_simple
+    assert_equal("1[.]1[.]1[.]1", defang_i_paddr("1.1.1.1") )
+    assert_equal("255[.]100[.]50[.]0", defang_i_paddr("255.100.50.0") )
+  end
+ 
+end
diff --git a/readme.md b/readme.md
index 753afc0..84c014c 100644
--- a/readme.md
+++ b/readme.md
@@ -19,6 +19,13 @@ cd problems/random-problem
 cargo test
 ```
 
+For programs written in Ruby:
+
+```bash
+cd problems/random-problem
+ruby test.rb
+```
+
 ## Solution structure
 
 For programs written in C:
@@ -29,3 +36,8 @@ For programs written in C:
 For programs written in Rust:
 
 - `src/lib.rs` - solution and tests
+
+For programs written in Ruby:
+
+- `main.rb` - the solution itself
+- `test.rb` - tests