diff --git a/config/config.go b/config/config.go
index 5b1a5d8f..4f3dfa67 100644
--- a/config/config.go
+++ b/config/config.go
@@ -133,13 +133,6 @@ func (c *Configuration) Setenv(key, value string) error {
 	return c.Env.(*EnvFetcher).Set(key, value)
 }
 
-// SetAllEnv is shorthand for `c.Env.SetAll(env)`.
-//
-// TODO(taylor): remove calls to this method and avoid cast.
-func (c *Configuration) SetAllEnv(env map[string]string) {
-	c.Env.(*EnvFetcher).SetAll(env)
-}
-
 // GetenvBool is shorthand for `c.Env.Bool(key, def)`.
 func (c *Configuration) GetenvBool(key string, def bool) bool {
 	return c.Env.Bool(key, def)
diff --git a/config/env_fetcher.go b/config/env_fetcher.go
index d3d1d543..e649026d 100644
--- a/config/env_fetcher.go
+++ b/config/env_fetcher.go
@@ -91,18 +91,3 @@ func (e *EnvFetcher) Set(key, val string) error {
 
 	return os.Setenv(key, val)
 }
-
-// SetAll replaces all key-value pairs with the given set, but does not modify
-// the system's environment.
-//
-// Note: this method is a temporary measure while some of the old tests still
-// rely on this mutable behavior.
-func (e *EnvFetcher) SetAll(env map[string]string) {
-	e.vmu.Lock()
-	defer e.vmu.Unlock()
-
-	e.vals = make(map[string]string)
-	for k, v := range env {
-		e.vals[k] = v
-	}
-}