diff --git a/Changes b/Changes
index 00ac645..4977111 100644
--- a/Changes
+++ b/Changes
@@ -11,6 +11,9 @@ v0.6.0 - UNRELEASED
   * The action `ViewArround` has been renamed to `ViewAround` (fix typo).
     The old name still works but shows a deprecation notice. If you have
     `"ViewArround"` in your config, please update it to `"ViewAround"`.
+  * Removed `Use256Color` config field. After the tcell migration,
+    256-color and truecolor support is automatic via terminfo detection.
+    Existing configs with this field will continue to load without error.
 
   [Features]
   * Added YAML configuration file support. You can now use
diff --git a/README.md b/README.md
index 45b2338..9055ab0 100644
--- a/README.md
+++ b/README.md
@@ -455,7 +455,6 @@ Below are configuration sections that you may specify in your config file:
 * [Styles](#styles)
 * [CustomFilter](#customfilter)
 * [Prompt](#prompt)
-* [Use256Color](#use256color)
 * [ANSI](#ansi)
 
 ## Global
@@ -800,7 +799,7 @@ Styles can be customized in `config.json`.
 - `"magenta"` for `tcell.ColorMagenta`
 - `"cyan"` for `tcell.ColorCyan`
 - `"white"` for `tcell.ColorWhite`
-- `"0"`-`"255"` for 256color ([Use256Color](#use256color) must be enabled)
+- `"0"`-`"255"` for 256color (automatically supported via tcell)
 
 ### Background Colors
 
@@ -812,7 +811,7 @@ Styles can be customized in `config.json`.
 - `"on_magenta"` for `tcell.ColorMagenta`
 - `"on_cyan"` for `tcell.ColorCyan`
 - `"on_white"` for `tcell.ColorWhite`
-- `"on_0"`-`"on_255"` for 256color ([Use256Color](#use256color) must be enabled)
+- `"on_0"`-`"on_255"` for 256color (automatically supported via tcell)
 
 ### Attributes
 
@@ -896,18 +895,6 @@ See --layout.
 }
 ```
 
-## Use256Color
-
-Boolean value that determines whether or not to use 256color. The default is `false`.
-
-Note: This has no effect on Windows because Windows console does not support extra color modes.
-
-```json
-{
-    "Use256Color": true
-}
-```
-
 # FAQ
 
 ## Does peco work on (msys2|cygwin)?
diff --git a/config.go b/config.go
index 34d0114..0f717d0 100644
--- a/config.go
+++ b/config.go
@@ -45,7 +45,6 @@ type Config struct {
 	Style               StyleSet                      `json:"Style" yaml:"Style"`
 	Prompt              string                        `json:"Prompt" yaml:"Prompt"`
 	Layout              string                        `json:"Layout" yaml:"Layout"`
-	Use256Color         bool                          `json:"Use256Color" yaml:"Use256Color"`
 	OnCancel            OnCancelBehavior              `json:"OnCancel" yaml:"OnCancel"`
 	CustomFilter        map[string]CustomFilterConfig `json:"CustomFilter" yaml:"CustomFilter"`
 	QueryExecutionDelay int                           `json:"QueryExecutionDelay" yaml:"QueryExecutionDelay"`
@@ -153,7 +152,6 @@ func (c *Config) Init() error {
 	c.Style.Init()
 	c.Prompt = DefaultPrompt
 	c.Layout = LayoutTypeTopDown
-	c.Use256Color = false
 	return nil
 }
 
diff --git a/contrib/man/peco.1 b/contrib/man/peco.1
index 6d8a8fe..5d1155d 100644
--- a/contrib/man/peco.1
+++ b/contrib/man/peco.1
@@ -741,8 +741,6 @@ CustomFilter
 .IP \[bu] 2
 Prompt
 .IP \[bu] 2
-Use256Color
-.IP \[bu] 2
 ANSI
 .SS Global
 .PP
@@ -1578,8 +1576,8 @@ used.
 .IP \[bu] 2
 \f[V]\[dq]white\[dq]\f[R] for \f[V]tcell.ColorWhite\f[R]
 .IP \[bu] 2
-\f[V]\[dq]0\[dq]\f[R]-\f[V]\[dq]255\[dq]\f[R] for 256color (Use256Color
-must be enabled)
+\f[V]\[dq]0\[dq]\f[R]-\f[V]\[dq]255\[dq]\f[R] for 256color
+(automatically supported via tcell)
 .SS Background Colors
 .IP \[bu] 2
 \f[V]\[dq]on_black\[dq]\f[R] for \f[V]tcell.ColorBlack\f[R]
@@ -1599,7 +1597,7 @@ must be enabled)
 \f[V]\[dq]on_white\[dq]\f[R] for \f[V]tcell.ColorWhite\f[R]
 .IP \[bu] 2
 \f[V]\[dq]on_0\[dq]\f[R]-\f[V]\[dq]on_255\[dq]\f[R] for 256color
-(Use256Color must be enabled)
+(automatically supported via tcell)
 .SS Attributes
 .IP \[bu] 2
 \f[V]\[dq]bold\[dq]\f[R] for fg: \f[V]tcell.AttrBold\f[R]
@@ -1735,21 +1733,6 @@ See \[en]layout.
 }
 \f[R]
 .fi
-.SS Use256Color
-.PP
-Boolean value that determines whether or not to use 256color.
-The default is \f[V]false\f[R].
-.PP
-Note: This has no effect on Windows because Windows console does not
-support extra color modes.
-.IP
-.nf
-\f[C]
-{
-    \[dq]Use256Color\[dq]: true
-}
-\f[R]
-.fi
 .SH FAQ
 .SS Does peco work on (msys2|cygwin)?
 .PP
diff --git a/peco.go b/peco.go
index cd20ed6..588fa59 100644
--- a/peco.go
+++ b/peco.go
@@ -84,7 +84,6 @@ type Peco struct {
 	readConfigFn        func(*Config, string) error
 	styles              StyleSet
 	enableANSI          bool // Enable ANSI color code support
-	use256Color         bool
 	fuzzyLongestSort    bool
 
 	// Source is where we buffer input. It gets reused when a new query is
@@ -241,10 +240,6 @@ func (p *Peco) Styles() *StyleSet {
 	return &p.styles
 }
 
-func (p *Peco) Use256Color() bool {
-	return p.use256Color
-}
-
 func (p *Peco) Prompt() string {
 	return p.prompt
 }
@@ -738,8 +733,6 @@ func (p *Peco) ApplyConfig(opts CLIOptions) error {
 		p.prompt = v
 	}
 
-	p.use256Color = p.config.Use256Color
-
 	p.onCancel = p.config.OnCancel
 	if p.onCancel == "" {
 		p.onCancel = OnCancelSuccess
diff --git a/peco_test.go b/peco_test.go
index b154dc4..eb204b6 100644
--- a/peco_test.go
+++ b/peco_test.go
@@ -405,7 +405,6 @@ func TestApplyConfig(t *testing.T) {
 	t.Run("Config-level fields", func(t *testing.T) {
 		p := newPeco()
 		p.config.MaxScanBufferSize = 512
-		p.config.Use256Color = true
 		p.config.FuzzyLongestSort = true
 		p.config.ANSI = true
 
@@ -413,7 +412,6 @@ func TestApplyConfig(t *testing.T) {
 		require.NoError(t, p.ApplyConfig(opts), "p.ApplyConfig should succeed")
 
 		require.Equal(t, 512, p.maxScanBufferSize, "p.maxScanBufferSize should be equal to config.MaxScanBufferSize")
-		require.True(t, p.use256Color, "p.use256Color should be true when config.Use256Color is true")
 		require.True(t, p.fuzzyLongestSort, "p.fuzzyLongestSort should be true when config.FuzzyLongestSort is true")
 		require.True(t, p.enableANSI, "p.enableANSI should be true when config.ANSI is true")
 	})