diff --git a/package.json b/package.json
index 3f8c0dbd4a8..ed5e66b3050 100644
--- a/package.json
+++ b/package.json
@@ -72,7 +72,7 @@
         "gulp-cached": "^1.1.1",
         "ignore": "^5.1.8",
         "jszip": "^3.5.0",
-        "mldoc": "0.5.5",
+        "mldoc": "0.5.6",
         "mousetrap": "^1.6.5",
         "path": "^0.12.7",
         "react": "^17.0.1",
diff --git a/src/main/frontend/components/block.cljs b/src/main/frontend/components/block.cljs
index 05775b887d5..3bafe790d48 100644
--- a/src/main/frontend/components/block.cljs
+++ b/src/main/frontend/components/block.cljs
@@ -572,22 +572,19 @@
     ["Subscript" l]
     (->elem :sub (map-inline config l))
     ["Tag" s]
-    (if (and s (util/tag-valid? s))
-      [:a.tag {:data-ref s
-               :href (rfe/href :page {:name s})
-               :on-click (fn [e]
-                           (let [repo (state/get-current-repo)
-                                 page (db/pull repo '[*] [:page/name (string/lower-case (util/url-decode s))])]
-                             (when (gobj/get e "shiftKey")
-                               (state/sidebar-add-block!
-                                repo
-                                (:db/id page)
-                                :page
-                                {:page page})
-                               (.preventDefault e))))}
-       (str "#" s)]
-      [:span.warning.mr-1 {:title "Invalid tag, tags only accept alphanumeric characters, \"-\", \"_\", \"@\" and \"%\"."}
-       (str "#" s)])
+    [:a.tag {:data-ref s
+             :href (rfe/href :page {:name s})
+             :on-click (fn [e]
+                         (let [repo (state/get-current-repo)
+                               page (db/pull repo '[*] [:page/name (string/lower-case (util/url-decode s))])]
+                           (when (gobj/get e "shiftKey")
+                             (state/sidebar-add-block!
+                              repo
+                              (:db/id page)
+                              :page
+                              {:page page})
+                             (.preventDefault e))))}
+     (str "#" s)]
     ["Emphasis" [[kind] data]]
     (let [elem (case kind
                  "Bold" :b
diff --git a/yarn.lock b/yarn.lock
index 87692e5c7ed..9ef37fa5216 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3853,10 +3853,10 @@ mkdirp@^0.5.4, mkdirp@~0.5.1:
   dependencies:
     minimist "^1.2.5"
 
-mldoc@0.5.5:
-  version "0.5.5"
-  resolved "https://registry.yarnpkg.com/mldoc/-/mldoc-0.5.5.tgz#cb7eea471adc94e1c7858d4ae772ddabe0a75753"
-  integrity sha512-acseZvvwzLNlvp6/fZzqP5rqS80keWOK1XCreem5eXJNxLtJm+xIqzEJVcsmeyFS1Leya1gPT7dMcCUOhEr26g==
+mldoc@0.5.6:
+  version "0.5.6"
+  resolved "https://registry.yarnpkg.com/mldoc/-/mldoc-0.5.6.tgz#aa4351791e11b9c8a8df359a9d87619d7ff02e5d"
+  integrity sha512-iRTuTmLUdR8OKiRrrM4dl+51jxAmOJ92+B3rsYuKZERaYcU0B9jiJBT9S2nDZldARNEwjhj8DKITdnJZMxArGQ==
   dependencies:
     yargs "^12.0.2"