diff --git a/CHANGELOG.md b/CHANGELOG.md
index a48b01c..f9afcd4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## [0.4.4] - 2024-10-31
+- Define the Ruby version for the gem
+- Add Completion feature for Gemini
+
 ## [0.2.0] - 2023-10-22
 - Add image generation abilities
 
diff --git a/Gemfile.lock b/Gemfile.lock
index ae8382f..03283c2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    gen-ai (0.4.3)
+    gen-ai (0.4.4)
       activesupport (~> 7.1)
       faraday (~> 2.7)
       faraday-multipart (~> 1.0)
@@ -143,6 +143,7 @@ GEM
 PLATFORMS
   arm64-darwin-22
   arm64-darwin-23
+  x86_64-darwin-22
   x86_64-linux
 
 DEPENDENCIES
diff --git a/lib/gen_ai/language/gemini.rb b/lib/gen_ai/language/gemini.rb
index b9e2b22..4614988 100644
--- a/lib/gen_ai/language/gemini.rb
+++ b/lib/gen_ai/language/gemini.rb
@@ -21,29 +21,40 @@ def initialize(token:, options: {})
         )
       end
 
-      def complete(prompt, options = {}); end
+      def complete(prompt, options = {})
+        response = @client.generate_content(generate_completion_options(prompt, options))
+
+        build_result(model: model(options), raw: response, parsed: extract_completions(response))
+      end
 
       def chat(messages, options = {}, &block)
         if block_given?
           response = @client.stream_generate_content(
-            generate_options(messages, options), server_sent_events: true, &chunk_process_block(block)
+            generate_chat_options(messages, options), server_sent_events: true, &chunk_process_block(block)
           )
           build_result(model: model(options), raw: response.first, parsed: extract_completions(response).flatten)
         else
-          response = @client.generate_content(generate_options(messages, options))
+          response = @client.generate_content(generate_chat_options(messages, options))
           build_result(model: model(options), raw: response, parsed: extract_completions(response))
         end
       end
 
       private
 
-      def generate_options(messages, options)
+      def generate_chat_options(messages, options)
         {
           contents: format_messages(messages),
           generationConfig: options.except(:model)
         }
       end
 
+      def generate_completion_options(prompt, options)
+        {
+          contents: [{ role: DEFAULT_ROLE, parts: [text: prompt] }],
+          generationConfig: options.except(:model)
+        }
+      end
+
       def model(options)
         options[:model] || COMPLETION_MODEL
       end
diff --git a/lib/gen_ai/version.rb b/lib/gen_ai/version.rb
index 0c80090..1095d5a 100644
--- a/lib/gen_ai/version.rb
+++ b/lib/gen_ai/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module GenAI
-  VERSION = '0.4.3'
+  VERSION = '0.4.4'
 end
diff --git a/spec/fixtures/cassettes/gemini/language/complete_default_prompt.yml b/spec/fixtures/cassettes/gemini/language/complete_default_prompt.yml
new file mode 100644
index 0000000..bf471a5
--- /dev/null
+++ b/spec/fixtures/cassettes/gemini/language/complete_default_prompt.yml
@@ -0,0 +1,105 @@
+---
+http_interactions:
+- request:
+    method: post
+    uri: https://generativelanguage.googleapis.com/v1/models/gemini-pro:generateContent?key=FAKE_TOKEN
+    body:
+      encoding: UTF-8
+      string: '{"contents":[{"role":"user","parts":[{"text":"Hello"}]}],"generationConfig":{}}'
+    headers:
+      User-Agent:
+      - Faraday v2.9.0
+      Content-Type:
+      - application/json
+      Expect:
+      - ''
+  response:
+    status:
+      code: 200
+      message: OK
+    headers:
+      Content-Type:
+      - application/json; charset=UTF-8
+      Vary:
+      - Origin
+      - Referer
+      - X-Origin
+      Content-Encoding:
+      - gzip
+      Date:
+      - Wed, 31 Jan 2024 11:02:30 GMT
+      Server:
+      - scaffolding on HTTPServer2
+      Cache-Control:
+      - private
+      Content-Length:
+      - '317'
+      X-Xss-Protection:
+      - '0'
+      X-Frame-Options:
+      - SAMEORIGIN
+      X-Content-Type-Options:
+      - nosniff
+      Server-Timing:
+      - gfet4t7; dur=1860
+      Alt-Svc:
+      - h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
+    body:body:
+      encoding: ASCII-8BIT
+      string: |
+        {
+          "candidates": [
+            {
+              "content": {
+                "parts": [
+                  {
+                    "text": "Hi there! How can I assist you today?"
+                  }
+                ],
+                "role": "model"
+              },
+              "finishReason": "STOP",
+              "index": 0,
+              "safetyRatings": [
+                {
+                  "category": "HARM_CATEGORY_SEXUALLY_EXPLICIT",
+                  "probability": "NEGLIGIBLE"
+                },
+                {
+                  "category": "HARM_CATEGORY_HATE_SPEECH",
+                  "probability": "NEGLIGIBLE"
+                },
+                {
+                  "category": "HARM_CATEGORY_HARASSMENT",
+                  "probability": "NEGLIGIBLE"
+                },
+                {
+                  "category": "HARM_CATEGORY_DANGEROUS_CONTENT",
+                  "probability": "NEGLIGIBLE"
+                }
+              ]
+            }
+          ],
+          "promptFeedback": {
+            "safetyRatings": [
+              {
+                "category": "HARM_CATEGORY_SEXUALLY_EXPLICIT",
+                "probability": "NEGLIGIBLE"
+              },
+              {
+                "category": "HARM_CATEGORY_HATE_SPEECH",
+                "probability": "NEGLIGIBLE"
+              },
+              {
+                "category": "HARM_CATEGORY_HARASSMENT",
+                "probability": "NEGLIGIBLE"
+              },
+              {
+                "category": "HARM_CATEGORY_DANGEROUS_CONTENT",
+                "probability": "NEGLIGIBLE"
+              }
+            ]
+          }
+        }
+  recorded_at: Wed, 31 Jan 2024 11:02:30 GMT
+recorded_with: VCR 6.2.0
diff --git a/spec/language/gemini/completion_spec.rb b/spec/language/gemini/completion_spec.rb
new file mode 100644
index 0000000..b697e24
--- /dev/null
+++ b/spec/language/gemini/completion_spec.rb
@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+RSpec.describe GenAI::Language do
+  describe 'Gemini' do
+    describe '#completion' do
+      let(:provider) { :gemini }
+      let(:token) { ENV['API_ACCESS_TOKEN'] || 'FAKE_TOKEN' }
+      let(:instance) { described_class.new(provider, token) }
+      let(:cassette) { 'gemini/language/complete_default_prompt' }
+
+      subject { instance.complete('Hello') }
+
+      it 'returns completions' do
+        VCR.use_cassette(cassette) do
+          expect(subject).to be_a(GenAI::Result)
+
+          expect(subject.provider).to eq(:gemini)
+          expect(subject.model).to eq('gemini-pro')
+
+          expect(subject.value).to eq('Hi there! How can I assist you today?')
+          expect(subject.values).to eq(['Hi there! How can I assist you today?'])
+
+          expect(subject.prompt_tokens).to eq(nil)
+          expect(subject.completion_tokens).to eq(nil)
+          expect(subject.total_tokens).to eq(nil)
+        end
+      end
+    end
+  end
+end