diff --git a/CHANGELOG.md b/CHANGELOG.md
index 692476ebe..edf48c689 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,7 +10,9 @@
 
 ##### Bug Fixes
 
-* None.
+* Fix crash when specifying empty Swift version. Now correctly uses the default
+  Swift version.  
+  [JP Simard](https://github.com/jpsim)
 
 ## 0.9.2
 
diff --git a/lib/jazzy/config.rb b/lib/jazzy/config.rb
index 9e44fe621..e666e2764 100644
--- a/lib/jazzy/config.rb
+++ b/lib/jazzy/config.rb
@@ -180,9 +180,12 @@ def expand_path(path)
       command_line: '--swift-version VERSION',
       default: nil,
       parse: ->(v) do
-        return nil if v.to_s.empty?
-        raise 'jazzy only supports Swift 2.0 or later.' if v.to_f < 2
-        v
+        if v.to_s.empty?
+          nil
+        else
+          raise 'jazzy only supports Swift 2.0 or later.' if v.to_f < 2
+          v
+        end
       end
 
     # ──────── Metadata ────────
diff --git a/spec/integration_spec.rb b/spec/integration_spec.rb
index 24b74c27e..94dc03130 100644
--- a/spec/integration_spec.rb
+++ b/spec/integration_spec.rb
@@ -210,8 +210,9 @@ def configure_cocoapods
       behaves_like cli_spec 'document_siesta',
                             # Siesta already has Docs/
                             '--output api-docs',
-                            # Use Swift 4.1 rather than the specified 3.0.2
-                            '--swift-version=4.1'
+                            # Use the default Swift version rather than the
+                            # specified 4.0
+                            '--swift-version='
     end
 
     describe 'Creates docs for Swift project with a variety of contents' do
diff --git a/spec/integration_specs b/spec/integration_specs
index fb95556ef..0583493d8 160000
--- a/spec/integration_specs
+++ b/spec/integration_specs
@@ -1 +1 @@
-Subproject commit fb95556ef2522cfe3171b490fa2542e9f9709c40
+Subproject commit 0583493d8ff2d89f5a27d304ec67ed69f9e27a99