diff --git a/notebooks/cards.clj b/notebooks/cards.clj
index a49fa949a..3daa274a4 100644
--- a/notebooks/cards.clj
+++ b/notebooks/cards.clj
@@ -11,7 +11,7 @@
 
 ;; ## Images
 (c/card
- (v/image "https://images.freeimages.com/images/large-previews/773/koldalen-4-1384902.jpg"))
+ (v/image "https://images.unsplash.com/photo-1532879311112-62b7188d28ce?w=1200&h=800&fit=crop"))
 
 ;; ## $\LaTeX$
 (c/card
diff --git a/notebooks/viewers/image.clj b/notebooks/viewers/image.clj
index 051de47a9..3c3186748 100644
--- a/notebooks/viewers/image.clj
+++ b/notebooks/viewers/image.clj
@@ -12,13 +12,13 @@
 ;; For convenience, you can use the `clerk/image` function to create a buffered image from a string or anything `java.awt.image.BufferedImage/read` takes. You can also use `clerk/figure` to show the image with a descriptive caption below it.
 
 ;; A large image with an aspect ratio smaller 2 is shown wider.
-(clerk/image "https://images.freeimages.com/images/large-previews/773/koldalen-4-1384902.jpg")
+(clerk/image "https://images.unsplash.com/photo-1532879311112-62b7188d28ce?w=1200&h=800&fit=crop")
 
 ;; Smaller images are centered and shown using their intrinsic dimensions. Here, we're using `clerk/figure`:
 (clerk/image "https://nextjournal.com/data/QmeyvaR3Q5XSwe14ZS6D5WBQGg1zaBaeG3SeyyuUURE2pq?filename=thermos.gif&content-type=image/gif")
 
 ;; Layout options are also available. For example, `{::clerk/width :full}` renders the image in full width.
-(clerk/image {::clerk/width :full} "https://images.freeimages.com/images/large-previews/773/koldalen-4-1384902.jpg")
+(clerk/image {::clerk/width :full} "https://images.unsplash.com/photo-1532879311112-62b7188d28ce?w=1200&h=800&fit=crop")
 
 ;; We also support local files for `clerk/image`:
 (clerk/image "trees.png")
diff --git a/notebooks/viewers/image_layouts.clj b/notebooks/viewers/image_layouts.clj
index 5c9631ac9..d8fcbe555 100644
--- a/notebooks/viewers/image_layouts.clj
+++ b/notebooks/viewers/image_layouts.clj
@@ -38,7 +38,7 @@
   [:figure
    [:img
     {:class "w-full"
-     :src "https://images.freeimages.com/images/large-previews/773/koldalen-4-1384902.jpg"}]
+     :src "https://images.unsplash.com/photo-1532879311112-62b7188d28ce?w=1200&h=800&fit=crop"}]
    [:figcaption.max-w-prose.text-sm.text-slate-500.sans-serif.mt-2
     "Content width, height based on aspect ratio"]])
 
@@ -46,7 +46,7 @@
   [:figure
    [:img
     {:class "w-full object-cover h-[300px]"
-     :src "https://images.freeimages.com/images/large-previews/773/koldalen-4-1384902.jpg"}]
+     :src "https://images.unsplash.com/photo-1532879311112-62b7188d28ce?w=1200&h=800&fit=crop"}]
    [:figcaption.text-sm.text-slate-500.sans-serif.mt-2
     "Content width, fixed height"]])
 
diff --git a/src/nextjournal/clerk/eval.clj b/src/nextjournal/clerk/eval.clj
index edd953614..46df9bd4a 100644
--- a/src/nextjournal/clerk/eval.clj
+++ b/src/nextjournal/clerk/eval.clj
@@ -273,8 +273,8 @@
           blocks))
 
 (defn cljs? [doc]
-  (boolean (and (string? (:file doc))
-                (str/ends-with? (:file doc) ".cljs"))))
+  (and (string? (:file doc))
+       (str/ends-with? (:file doc) ".cljs")))
 
 ;; TODO: used in builder to drop analyzer dependency, cfr. below
 (defn analyze-doc [doc] (-> doc analyzer/build-graph analyzer/hash))
diff --git a/test/nextjournal/clerk/render/hashing_test.clj b/test/nextjournal/clerk/render/hashing_test.clj
index c9b126e23..c2b049018 100644
--- a/test/nextjournal/clerk/render/hashing_test.clj
+++ b/test/nextjournal/clerk/render/hashing_test.clj
@@ -1,5 +1,6 @@
 (ns nextjournal.clerk.render.hashing-test
-  (:require [clojure.test :refer [deftest is testing]]
+  (:require [clojure.string :as str]
+            [clojure.test :refer [deftest is testing]]
             [nextjournal.clerk.render.hashing :as hashing]))
 
 (deftest front-end-hash
@@ -7,6 +8,6 @@
     (let [debug-dejavu (System/getProperty "nextjournal.dejavu.debug")]
       (when-not debug-dejavu
         (System/setProperty "nextjournal.dejavu.debug" "1"))
-      (is (hashing/front-end-hash))
+      (is (not (str/blank? (hashing/front-end-hash))))
       (when-not debug-dejavu
         (System/clearProperty "nextjournal.dejavu.debug")))))