diff --git a/src/skuld/http.clj b/src/skuld/http.clj
index 4486914..e2c21c8 100644
--- a/src/skuld/http.clj
+++ b/src/skuld/http.clj
@@ -17,7 +17,7 @@
 (defn- encode-bytes
   "Encode a bytes to the json generator."
   [^Bytes b ^JsonGenerator jg]
-  (.writeString jg (-> ^Bytes b .bytes b64/encode String. (.replaceAll "\\+" "-") (.replaceAll "/" "_"))))
+  (.writeString jg (-> ^Bytes b .bytes b64/encode String.)))
 
 ;; Custom Cheshire encoder for the Bytes type
 (add-encoder Bytes encode-bytes)
@@ -62,7 +62,12 @@
 (defn- b64->id
   "Coerces a base64-encoded id into a Bytes type."
   [^String b64-id]
-  (-> b64-id (.replaceAll "-" "+") (.replaceAll "_" "/" ) .getBytes b64/decode Bytes.))
+  (-> b64-id (.replaceAll "-" "+") (.replaceAll "_" "/") .getBytes b64/decode Bytes.))
+
+(defn- b64->bytes
+  "Coerce a base64-encoded value into a Bytes type."
+  [^String b64-str]
+  (-> b64-str .getBytes b64/decode Bytes.))
 
 (defn- parse-int
   "Safely coerces a string into an integer. If the conversion is impossible,
@@ -99,6 +104,18 @@
         ret (node/complete! node msg)]
     (POST req (dissoc ret :responses))))
 
+(defn- update!
+  "Like `node/update!`, but wrapped around an HTTP request."
+  [node req id]
+  (let [id  (b64->id id)
+        cid (-> req :body :cid)
+        lid (-> req :body :lid)
+        msg (-> req :body :msg b64->bytes)
+        w   (-> req :query-params :w parse-int)
+        msg {:task-id id :claim-id cid :log-id lid :message msg :w w}
+        ret (node/update! node msg)]
+    (POST req (dissoc ret :responses))))
+
 (defn- count-tasks
   "Like `node/count-tasks`, but wrapped around an HTTP request."
   [node req]
@@ -145,6 +162,7 @@
     (condp route-matches req
       "/queue/count"        (count-queue node req)
       "/tasks/claim"        (claim! node req)
+      "/tasks/update/:id"   :>> (fn [{:keys [id]}] (update! node req id))
       "/tasks/complete/:id" :>> (fn [{:keys [id]}] (complete! node req id))
       "/tasks/count"        (count-tasks node req)
       "/tasks/enqueue"      (enqueue! node req)
diff --git a/src/skuld/node.clj b/src/skuld/node.clj
index fad8048..8936580 100644
--- a/src/skuld/node.clj
+++ b/src/skuld/node.clj
@@ -352,6 +352,29 @@
          (vnode node))
     msg))
 
+(defn update-local!
+  [node msg]
+  (let [part (->> msg :task-id (partition-name node))]
+    (if-let [vnode (vnode node part)]
+      (do (vnode/update! vnode msg)
+          {:w 1})
+      {:error (str "I don't have partition" part "for task" (:task-id msg))})))
+
+(defn update!
+  [node msg]
+  (let [w (or (:w msg) 2)
+        responses (net/sync-req! (:net node)
+                                 (preflist node (:task-id msg))
+                                 {:r w}
+                                 (merge msg {:type :update-local}))
+        acks (remove :error responses)
+        w'    (reduce + (map :w acks))]
+    (if (<= w w')
+      {:w w'}
+      {:w w'
+       :error "not enough nodes acknowledged request for update"
+       :responses responses})))
+
 (defn complete-local!
   "Completes a given task on a local vnode."
   [node msg]
@@ -431,6 +454,8 @@
        :claim              claim!
        :claim-local        claim-local!
        :request-claim      request-claim!
+       :update             update!
+       :update-local       update-local!
        :complete           complete!
        :complete-local     complete-local!
        :wipe               wipe!
diff --git a/src/skuld/task.clj b/src/skuld/task.clj
index 0565c65..1b20190 100644
--- a/src/skuld/task.clj
+++ b/src/skuld/task.clj
@@ -9,11 +9,11 @@
 
   {:start     (long) milliseconds in linear time
    :end       (long) milliseconds in linear time
-   :completed (long) milliseconds in linear time}"
+   :completed (long) milliseconds in linear time
+   :logs      [...]  a vector of logs}"
   (:refer-clojure :exclude [merge])
-  (:use skuld.util)
   (:require [skuld.flake :as flake]
-            [skuld.util :refer [fress-read fress-write]])
+            [skuld.util :refer [fress-read fress-write assocv]])
   (:import com.aphyr.skuld.Bytes))
 
 (def clock-skew-buffer
@@ -33,7 +33,8 @@
   (let [now (flake/linear-time)]
     {:start     now
      :end       (+ now dt)
-     :completed nil}))
+     :completed nil
+     :logs      []}))
 
 (defn valid-claim?
   "Is a claim currently valid?"
@@ -88,6 +89,11 @@
   [task claim-idx t]
   (assoc-in task [:claims claim-idx :completed] t))
 
+(defn update
+  "Return a copy of the task with the log updated. Takes a claim index, log index
+  and message."
+  [task claim-idx log-idx message]
+  (assoc-in task [:claims claim-idx :logs log-idx] message))
 
 (defn merge-by
   "Merges times by merge-fn"
@@ -97,6 +103,19 @@
       nil
       (apply merge-fn valid-times))))
 
+(defn merge-logs
+  "Merge logs vectors by picking the first non-nil value from each index"
+  [& logses]
+  (->> logses
+       (map count)
+       (apply max)
+       range
+       (mapv (fn [i]
+               (->> logses
+                    (map #(nth % i nil))
+                    (keep identity)
+                    first)))))
+
 (defn merge-claims
   "Merges a collection of vectors of claims together."
   [claims]
@@ -120,7 +139,9 @@
                                                      (:end claim))
                                 :completed (merge-by min
                                                      (:completed merged)
-                                                     (:completed claim))}
+                                                     (:completed claim))
+                                :logs      (merge-logs (:logs merged)
+                                                       (:logs claim))}
                                claim)
                              merged))
                          nil
diff --git a/src/skuld/util.clj b/src/skuld/util.clj
index c122562..01845a4 100644
--- a/src/skuld/util.clj
+++ b/src/skuld/util.clj
@@ -85,17 +85,17 @@
                   (list value))
           vec))))
 
-(defn update
-  "Like update-in, but takes a single key. Given a map, a key, a function, and
-  args, updates the value of (get map key) to be (f current-value arg1 arg2
-  ...)"
-  [m k f & args]
-  (assoc m k (apply f (get m k) args)))
-
-(defn update!
-  "Transient version of update"
-  [m k f & args]
-  (assoc! m k (apply f (get m k) args)))
+;(defn update
+;  "Like update-in, but takes a single key. Given a map, a key, a function, and
+;  args, updates the value of (get map key) to be (f current-value arg1 arg2
+;  ...)"
+;  [m k f & args]
+;  (assoc m k (apply f (get m k) args)))
+;
+;(defn update!
+;  "Transient version of update"
+;  [m k f & args]
+;  (assoc! m k (apply f (get m k) args)))
 
 (defmacro compare+
   "Expands into a comparison between a and b on the basis of function f1, then
diff --git a/src/skuld/vnode.clj b/src/skuld/vnode.clj
index 9a0b053..3132b99 100644
--- a/src/skuld/vnode.clj
+++ b/src/skuld/vnode.clj
@@ -571,6 +571,18 @@
         ; The ID in the queue did not exist in the database
         (recur vnode queue-name dt)))))
 
+(defn update!
+  "Updates the given task in the specified claim. Msg should contain:
+
+  :task-id  The task identifier
+  :claim-id The claim index
+  :log-id   The log index
+  :message  The log message contents as a byte array"
+  [vnode {:keys [task-id claim-id log-id message] :as msg}]
+  (merge-task! vnode
+               (-> vnode
+                   (get-task task-id)
+                   (task/update claim-id log-id message))))
 
 (defn complete!
   "Completes the given task in the specified claim. Msg should contain:
diff --git a/test/skuld/node_test.clj b/test/skuld/node_test.clj
index ba2bb54..56bc501 100644
--- a/test/skuld/node_test.clj
+++ b/test/skuld/node_test.clj
@@ -341,6 +341,20 @@
               (is (= id id*))
               (is (not= claims []))))))
 
+      ;; Add a log message
+      (let [uri (str "http://127.0.0.1:13100/tasks/update/" id)
+            cid 0
+            lid 0
+            resp (http/post uri {:form-params {:cid cid :lid lid :message "status=10"}
+                                 :content-type :json
+                                 :as :json})
+            content-type (get-in resp [:headers "content-type"])
+            resp* (http/get (str "http://127.0.0.1:13100/tasks/" id "?r=3")
+                            {:as :json})
+            logs (-> resp* :body :task :claims (nth cid) :logs)]
+        (is (= 200 (:status resp)))
+        (is (= "application/json;charset=utf-8" content-type))
+        (is (not (nil? logs))))
 
       ;; Finally let's complete it
       (let [uri (str "http://127.0.0.1:13100/tasks/complete/" id)
diff --git a/test/skuld/task_test.clj b/test/skuld/task_test.clj
index 20e3243..fda3591 100644
--- a/test/skuld/task_test.clj
+++ b/test/skuld/task_test.clj
@@ -45,14 +45,26 @@
     (let [t (task {:data :hi})]
       (is (= (merge (assoc t :claims [{:start 0 :end 1 :completed 100}])
                     (assoc t :claims [{:start 2 :end 4 :completed 50}]))
-             (assoc t :claims [{:start 0 :end 4 :completed 50}])))))
+             (assoc t :claims [{:start 0 :end 4 :completed 50 :logs []}])))))
 
   (testing "completed without start"
     (let [t (task {:data :hi})]
       (is (= (merge (assoc t :claims [{:start 0 :end 1 :completed 100}])
                     (assoc t :claims [{:start 2 :end 4}])
                     (assoc t :claims [{:completed 50}]))
-             (assoc t :claims [{:start 0 :end 4 :completed 50}]))))))
+             (assoc t :claims [{:start 0 :end 4 :completed 50 :logs []}])))))
+
+  (testing "a claim with different logs"
+    (let [t (task {:data :hi})]
+      (is (= (merge (assoc t :claims [{:start 0 :end 1 :logs ["one"]}])
+                    (assoc t :claims [{:start 0 :end 1 :logs [nil "two"]}]))
+             (assoc t :claims [{:start 0 :end 1 :completed nil :logs ["one" "two"]}])))))
+
+  (testing "a claim with some of the same logs"
+    (let [t (task {:data :hi})]
+      (is (= (merge (assoc t :claims [{:start 0 :end 1 :logs ["one"]}])
+                    (assoc t :claims [{:start 0 :end 1 :logs ["one" "two"]}]))
+             (assoc t :claims [{:start 0 :end 1 :completed nil :logs ["one" "two"]}]))))))
 
 
 (deftest claim-test