diff --git a/CHANGELOG.md b/CHANGELOG.md
index b5e649340907..f254b95a8415 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fix generation of `div:not(.foo)` if `.foo` is never defined ([#7815](https://github.com/tailwindlabs/tailwindcss/pull/7815))
 - Allow for custom properties in `rgb`, `rgba`, `hsl` and `hsla` colors ([#7933](https://github.com/tailwindlabs/tailwindcss/pull/7933))
 - Remove autoprefixer as explicit peer-dependency to avoid invalid warnings in situations where it isn't actually needed ([#7949](https://github.com/tailwindlabs/tailwindcss/pull/7949))
+- Types: allow for arbitrary theme values (for 3rd party plugins) ([#7926](https://github.com/tailwindlabs/tailwindcss/pull/7926))
 
 ### Changed
 
diff --git a/types/config.d.ts b/types/config.d.ts
index 97c4dfd9c4f7..b033bc319ef6 100644
--- a/types/config.d.ts
+++ b/types/config.d.ts
@@ -15,7 +15,7 @@ type ResolvableTo<T> = T | ((utils: PluginUtils) => T)
 
 interface PluginUtils {
   colors: DefaultColors
-  theme(path: string, defaultValue: unknown): keyof ThemeConfig
+  theme(path: string, defaultValue?: unknown): any
   breakpoints<I = Record<string, unknown>, O = I>(arg: I): O
   rgb(arg: string): (arg: Partial<{ opacityVariable: string; opacityValue: number }>) => string
   hsl(arg: string): (arg: Partial<{ opacityVariable: string; opacityValue: number }>) => string
@@ -218,6 +218,9 @@ interface ThemeConfig {
   transitionDuration: ResolvableTo<KeyValuePair>
   willChange: ResolvableTo<KeyValuePair>
   content: ResolvableTo<KeyValuePair>
+
+  /** Custom */
+  [key: string]: any
 }
 
 // Core plugins related config
@@ -320,4 +323,3 @@ interface OptionalConfig {
 }
 
 export type Config = RequiredConfig & Partial<OptionalConfig>
-