diff --git a/src/taoensso/timbre.clj b/src/taoensso/timbre.clj
index aada6e7..00ba307 100644
--- a/src/taoensso/timbre.clj
+++ b/src/taoensso/timbre.clj
@@ -397,6 +397,11 @@
         }))
     nil))
 
+(def ^:dynamic *config-dynamic* nil)
+(defmacro with-logging-config
+  "Allows thread-local logging config override. Useful for dev & testing."
+  [config & body] `(binding [*config-dynamic* ~config] ~@body))
+
 (defmacro log* "Implementation detail."
   {:arglists '([base-appender-args msg-type level & log-args]
                [base-appender-args msg-type config level & log-args])}
@@ -412,7 +417,7 @@
     `(let [;;; Support [level & log-args], [config level & log-args] sigs:
            s1# ~s1
            default-config?# (levels-scored s1#)
-           config# (if default-config?# @config s1#)
+           config# (if default-config?# (or *config-dynamic* @config) s1#)
            level#  (if default-config?# s1#     ~s2)
            compile-time-ns# ~(str *ns*)]
        ;; (println "DEBUG: Runtime level check")
@@ -495,7 +500,8 @@
     '[taoensso.timbre :as timbre
       :refer (log  trace  debug  info  warn  error  fatal  report
               logf tracef debugf infof warnf errorf fatalf reportf
-              spy logged-future with-log-level sometimes)])
+              spy logged-future with-log-level with-logging-config
+              sometimes)])
   (require
     '[taoensso.timbre.profiling :as profiling
       :refer (pspy pspy* profile defnp p p*)])"
@@ -504,7 +510,8 @@
    '[taoensso.timbre :as timbre
      :refer (log  trace  debug  info  warn  error  fatal  report
              logf tracef debugf infof warnf errorf fatalf reportf
-             spy logged-future with-log-level sometimes)])
+             spy logged-future with-log-level with-logging-config
+             sometimes)])
   (require
    '[taoensso.timbre.profiling :as profiling
      :refer (pspy pspy* profile defnp p p*)]))