diff --git a/Gemfile b/Gemfile
index 635433d2f..522a0c158 100644
--- a/Gemfile
+++ b/Gemfile
@@ -33,7 +33,7 @@ gem "bootstrap", ">= 5.0.0"
 gem 'material_icons'
 
 # icons
-gem 'font-awesome-sass'
+gem 'font-awesome-sass', '~> 6.7'
 
 gem 'terser'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 229b3dcc9..9763e67ff 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -276,8 +276,8 @@ GEM
     ffi (1.17.4)
     ffi (1.17.4-x86_64-linux-gnu)
     flickraw (0.9.10)
-    font-awesome-sass (5.15.1)
-      sassc (>= 1.11)
+    font-awesome-sass (6.7.2)
+      sassc (~> 2.0)
     friendly_id (5.7.0)
       activerecord (>= 4.0.0)
     gbifrb (0.2.0)
@@ -793,7 +793,7 @@ DEPENDENCIES
   faker
   faraday
   flickraw
-  font-awesome-sass
+  font-awesome-sass (~> 6.7)
   friendly_id
   gbifrb
   geocoder
diff --git a/app/assets/stylesheets/_garden_cards.scss b/app/assets/stylesheets/_garden_cards.scss
index 097bc60e0..e3fb60c3c 100644
--- a/app/assets/stylesheets/_garden_cards.scss
+++ b/app/assets/stylesheets/_garden_cards.scss
@@ -120,7 +120,10 @@ $garden-card-line: #e6e6e6;
     background: none;
     cursor: pointer;
 
-    .fa {
+    // The icon, whatever style prefix it carries. Keyed on the element rather
+    // than .fa, which stopped matching when Font Awesome 6 dropped the bare
+    // prefix and every icon became .fas, .far or .fab.
+    i {
       margin-left: 0.35rem;
       opacity: 0.5;
     }
@@ -129,7 +132,7 @@ $garden-card-line: #e6e6e6;
     &:focus-visible {
       color: var(--bs-link-color, #0a58ca);
 
-      .fa {
+      i {
         opacity: 1;
       }
     }
diff --git a/app/assets/stylesheets/application.scss b/app/assets/stylesheets/application.scss
index 209a832da..8fe464074 100644
--- a/app/assets/stylesheets/application.scss
+++ b/app/assets/stylesheets/application.scss
@@ -9,8 +9,13 @@
 @import "leaflet.markercluster/dist/MarkerCluster";
 @import "leaflet.markercluster/dist/MarkerCluster.Default";
 
-// Font Awesome
-@import "font-awesome-sprockets";
+// Font Awesome. The 6.x gem dropped its _font-awesome-sprockets.scss but its
+// @font-face rules still call fa-font-path(), so we define it here against
+// Sprockets' font-path helper. Its fonts live under assets/fonts/font-awesome.
+@function fa-font-path($path) {
+  @return font-path("font-awesome/#{$path}");
+}
+
 @import "font-awesome";
 @import "material_icons";
 @import "rails_bootstrap_forms";
diff --git a/app/helpers/icons_helper.rb b/app/helpers/icons_helper.rb
index 80c118d00..e51f398a8 100644
--- a/app/helpers/icons_helper.rb
+++ b/app/helpers/icons_helper.rb
@@ -76,7 +76,7 @@ module IconsHelper
   end
 
   def activity_icon
-    icon('fas', 'fa-truck-pickup')
+    icon('fas', 'truck-pickup')
   end
 
   def post_icon
diff --git a/app/javascript/components/AddPhotoModal.jsx b/app/javascript/components/AddPhotoModal.jsx
index c8e8f4590..60288a36e 100644
--- a/app/javascript/components/AddPhotoModal.jsx
+++ b/app/javascript/components/AddPhotoModal.jsx
@@ -141,7 +141,7 @@ export default function AddPhotoModal({label, newUrl, iconUrl, onClose, onAdded}
         </div>
       )}
       {!loadError && !data && (
-        <div className="modal-body" role="status"><i className="fa fa-spinner fa-spin" aria-hidden="true" /> Loading…</div>
+        <div className="modal-body" role="status"><i className="fas fa-spinner fa-spin" aria-hidden="true" /> Loading…</div>
       )}
       {data && (
         <>
@@ -161,7 +161,7 @@ export default function AddPhotoModal({label, newUrl, iconUrl, onClose, onAdded}
                 </button>
                 {waiting && (
                   <div className="photo-picker-waiting" role="status">
-                    <i className="fa fa-spinner fa-spin" aria-hidden="true" />{' '}
+                    <i className="fas fa-spinner fa-spin" aria-hidden="true" />{' '}
                     {blocked ? 'Your browser blocked the window.' : 'Waiting for you to allow access on Flickr…'}{' '}
                     {blocked && <a href={CONNECT_URL} target="_blank" rel="noopener noreferrer">Connect in a new tab</a>}
                     {!blocked && <span className="photo-picker-hint">This picks up on its own once you have.</span>}
@@ -216,7 +216,7 @@ export default function AddPhotoModal({label, newUrl, iconUrl, onClose, onAdded}
               <>
                 {errors.length > 0 && (
                   <div className="alert alert-danger" role="alert">
-                    <i className="fa fa-exclamation-triangle" aria-hidden="true" />{' '}
+                    <i className="fas fa-exclamation-triangle" aria-hidden="true" />{' '}
                     <strong>That didn&rsquo;t work.</strong>
                     <ul className="mb-0">{errors.map((message) => <li key={message}>{message}</li>)}</ul>
                     <span>Your choice is kept, so you can press Add photo to try again.</span>
@@ -232,7 +232,7 @@ export default function AddPhotoModal({label, newUrl, iconUrl, onClose, onAdded}
                       <img src={chosen.preview_url} alt={chosen.title || 'The photo you chose'} className="photo-picker-preview" />
                       <span className="photo-picker-title">{chosen.title}</span>
                       <button type="button" className="btn btn-sm btn-outline-secondary ms-3" onClick={() => setChosen(null)} disabled={saving}>
-                        <i className="fa fa-edit" aria-hidden="true" /> Change<span className="visually-hidden"> photo</span>
+                        <i className="fas fa-edit" aria-hidden="true" /> Change<span className="visually-hidden"> photo</span>
                       </button>
                     </dd>
                   </dl>
@@ -245,7 +245,7 @@ export default function AddPhotoModal({label, newUrl, iconUrl, onClose, onAdded}
             <div className="modal-footer">
               <button type="button" className="btn btn-link" onClick={() => setChosen(null)} disabled={saving}>Back</button>
               <button type="button" className="btn btn-success btn-plant" onClick={add} disabled={saving} aria-busy={saving} autoFocus>
-                {saving ? <><i className="fa fa-spinner fa-spin" aria-hidden="true" /> Adding…</> : 'Add photo'}
+                {saving ? <><i className="fas fa-spinner fa-spin" aria-hidden="true" /> Adding…</> : 'Add photo'}
               </button>
             </div>
           )}
diff --git a/app/javascript/components/CropPicker.jsx b/app/javascript/components/CropPicker.jsx
index 08799fb06..d6c59ce0b 100644
--- a/app/javascript/components/CropPicker.jsx
+++ b/app/javascript/components/CropPicker.jsx
@@ -95,7 +95,7 @@ export default function CropPicker({id, onChoose}) {
     <div className="crop-picker position-relative">
       <label htmlFor={id} className="crop-picker-label">What did you plant?</label>
       <div className="crop-picker-field">
-        <i className="fa fa-search crop-picker-icon" aria-hidden="true" />
+        <i className="fas fa-search crop-picker-icon" aria-hidden="true" />
         <input
           id={id}
           type="text"
@@ -113,14 +113,14 @@ export default function CropPicker({id, onChoose}) {
           onChange={(event) => setTerm(event.target.value)}
           onKeyDown={onKeyDown}
         />
-        {searching && <i className="fa fa-spinner fa-spin crop-picker-spinner" aria-hidden="true" />}
+        {searching && <i className="fas fa-spinner fa-spin crop-picker-spinner" aria-hidden="true" />}
       </div>
       <div id={`${id}-status`} className="crop-picker-hint" role="status">
         {hint(searching, open, results.length)}
       </div>
       {noMatch && (
         <div className="crop-picker-empty">
-          <i className="fa fa-info-circle" aria-hidden="true" />{' '}
+          <i className="fas fa-info-circle" aria-hidden="true" />{' '}
           No crops match &ldquo;{term}&rdquo;.{' '}
           <a href="/crops/new" target="_blank" rel="noopener noreferrer">Request a new crop</a>
         </div>
diff --git a/app/javascript/components/EditGardenModal.jsx b/app/javascript/components/EditGardenModal.jsx
index 0d719bef5..0bd91008f 100644
--- a/app/javascript/components/EditGardenModal.jsx
+++ b/app/javascript/components/EditGardenModal.jsx
@@ -76,7 +76,7 @@ export default function EditGardenModal({garden, onClose, onSaved}) {
         </div>
       )}
       {!loadError && !values && (
-        <div className="modal-body" role="status"><i className="fa fa-spinner fa-spin" aria-hidden="true" /> Loading…</div>
+        <div className="modal-body" role="status"><i className="fas fa-spinner fa-spin" aria-hidden="true" /> Loading…</div>
       )}
       {values && (
         <form onSubmit={save}>
@@ -146,7 +146,7 @@ export default function EditGardenModal({garden, onClose, onSaved}) {
           </div>
           <div className="modal-footer">
             <button type="submit" className="btn btn-success btn-plant" disabled={saving} aria-busy={saving}>
-              {saving ? <><i className="fa fa-spinner fa-spin" aria-hidden="true" /> Saving…</> : 'Save garden'}
+              {saving ? <><i className="fas fa-spinner fa-spin" aria-hidden="true" /> Saving…</> : 'Save garden'}
             </button>
           </div>
         </form>
diff --git a/app/javascript/components/EditPlantingModal.jsx b/app/javascript/components/EditPlantingModal.jsx
index eaeaafa13..db03287e2 100644
--- a/app/javascript/components/EditPlantingModal.jsx
+++ b/app/javascript/components/EditPlantingModal.jsx
@@ -91,7 +91,7 @@ export default function EditPlantingModal({planting, onClose, onSaved}) {
         </div>
       )}
       {!loadError && !values && (
-        <div className="modal-body" role="status"><i className="fa fa-spinner fa-spin" aria-hidden="true" /> Loading…</div>
+        <div className="modal-body" role="status"><i className="fas fa-spinner fa-spin" aria-hidden="true" /> Loading…</div>
       )}
       {values && (
         <form onSubmit={save}>
@@ -114,7 +114,7 @@ export default function EditPlantingModal({planting, onClose, onSaved}) {
                 <>
                   <strong>{values.crop.name}</strong>{' '}
                   <button type="button" className="btn btn-sm btn-outline-secondary" onClick={() => setChangingCrop(true)}>
-                    <i className="fa fa-edit" aria-hidden="true" /> Change<span className="visually-hidden"> crop</span>
+                    <i className="fas fa-edit" aria-hidden="true" /> Change<span className="visually-hidden"> crop</span>
                   </button>
                 </>
               )}
@@ -183,7 +183,7 @@ export default function EditPlantingModal({planting, onClose, onSaved}) {
           <div className="modal-footer">
             <button type="button" className="btn btn-link" onClick={onClose} disabled={saving}>Cancel</button>
             <button type="submit" className="btn btn-success" disabled={saving} aria-busy={saving}>
-              {saving ? <><i className="fa fa-spinner fa-spin" aria-hidden="true" /> Saving…</> : 'Save'}
+              {saving ? <><i className="fas fa-spinner fa-spin" aria-hidden="true" /> Saving…</> : 'Save'}
             </button>
           </div>
         </form>
diff --git a/app/javascript/components/GardenCard.jsx b/app/javascript/components/GardenCard.jsx
index 6c92523ec..613f0a2a2 100644
--- a/app/javascript/components/GardenCard.jsx
+++ b/app/javascript/components/GardenCard.jsx
@@ -36,14 +36,14 @@ export default function GardenCard({garden, defaultIconUrl, onPlant, highlighted
         <div className="garden-card-header-actions">
           {plantUrl && (
             <a href={plantUrl} className="btn btn-success btn-sm garden-add-planting" onClick={plant}>
-              <i className="fa fa-plus" aria-hidden="true" /> Add planting
+              <i className="fas fa-plus" aria-hidden="true" /> Add planting
               <span className="visually-hidden"> to {name}</span>
             </a>
           )}
           <ActionsMenu
             id={`garden-${id}`}
             actions={actions}
-            label={<i className="fa fa-ellipsis-v" aria-hidden="true" />}
+            label={<i className="fas fa-ellipsis-v" aria-hidden="true" />}
             ariaLabel={`Actions for ${name}`}
             className="btn btn-sm btn-link actions-toggle-dots"
             onSelect={(action, event) => {
diff --git a/app/javascript/components/GardenCards.jsx b/app/javascript/components/GardenCards.jsx
index 549ab93ef..2a6791a06 100644
--- a/app/javascript/components/GardenCards.jsx
+++ b/app/javascript/components/GardenCards.jsx
@@ -108,7 +108,7 @@ export default function GardenCards({gardens: initialGardens, default_icon_url:
     <>
       {notice && (
         <div className="alert alert-success alert-dismissible" role="status">
-          <i className="fa fa-check-circle" aria-hidden="true" /> {notice}
+          <i className="fas fa-check-circle" aria-hidden="true" /> {notice}
           <button type="button" className="btn-close" aria-label="Dismiss" onClick={() => setNotice(null)} />
         </div>
       )}
diff --git a/app/javascript/components/MarkFinishedModal.jsx b/app/javascript/components/MarkFinishedModal.jsx
index 5773f9eb8..ca497be30 100644
--- a/app/javascript/components/MarkFinishedModal.jsx
+++ b/app/javascript/components/MarkFinishedModal.jsx
@@ -72,7 +72,7 @@ export default function MarkFinishedModal({planting, iconUrl, onClose, onSaved})
         <div className="modal-body plant-dialog-body">
           {errors.length > 0 && (
             <div className="alert alert-danger" role="alert">
-              <i className="fa fa-exclamation-triangle" aria-hidden="true" />{' '}
+              <i className="fas fa-exclamation-triangle" aria-hidden="true" />{' '}
               <strong>That didn&rsquo;t save.</strong>
               <ul className="mb-0">{errors.map((message) => <li key={message}>{message}</li>)}</ul>
               <span>What you entered is kept, so you can press Mark as finished to try again.</span>
@@ -118,7 +118,7 @@ export default function MarkFinishedModal({planting, iconUrl, onClose, onSaved})
         </div>
         <div className="modal-footer">
           <button type="submit" className="btn btn-success btn-plant" disabled={saving || !finishedAt} aria-busy={saving}>
-            {saving ? <><i className="fa fa-spinner fa-spin" aria-hidden="true" /> Saving…</> : 'Mark as finished'}
+            {saving ? <><i className="fas fa-spinner fa-spin" aria-hidden="true" /> Saving…</> : 'Mark as finished'}
           </button>
         </div>
       </form>
diff --git a/app/javascript/components/PlantPartPicker.jsx b/app/javascript/components/PlantPartPicker.jsx
index bc979b70f..fe4300fd0 100644
--- a/app/javascript/components/PlantPartPicker.jsx
+++ b/app/javascript/components/PlantPartPicker.jsx
@@ -65,7 +65,7 @@ export default function PlantPartPicker({id, parts, suggestedId, onChoose}) {
     <div className="crop-picker position-relative">
       <label htmlFor={id} className="crop-picker-label">What part did you harvest?</label>
       <div className="crop-picker-field">
-        <i className="fa fa-search crop-picker-icon" aria-hidden="true" />
+        <i className="fas fa-search crop-picker-icon" aria-hidden="true" />
         <input
           id={id}
           type="text"
@@ -95,7 +95,7 @@ export default function PlantPartPicker({id, parts, suggestedId, onChoose}) {
       </div>
       {noMatch && (
         <div className="crop-picker-empty">
-          <i className="fa fa-info-circle" aria-hidden="true" /> No plant parts match &ldquo;{term}&rdquo;.
+          <i className="fas fa-info-circle" aria-hidden="true" /> No plant parts match &ldquo;{term}&rdquo;.
         </div>
       )}
       {showing && (
diff --git a/app/javascript/components/PlantSomethingModal.jsx b/app/javascript/components/PlantSomethingModal.jsx
index 0eff9a2f1..6bd9239bc 100644
--- a/app/javascript/components/PlantSomethingModal.jsx
+++ b/app/javascript/components/PlantSomethingModal.jsx
@@ -66,7 +66,7 @@ export default function PlantSomethingModal({garden, iconUrl, onClose, onCreated
         <Steps steps={STEPS} current={crop ? 2 : 1} />
         {errors.length > 0 && (
           <div className="alert alert-danger" role="alert">
-            <i className="fa fa-exclamation-triangle" aria-hidden="true" />{' '}
+            <i className="fas fa-exclamation-triangle" aria-hidden="true" />{' '}
             <strong>That didn&rsquo;t work.</strong>
             <ul className="mb-0">{errors.map((message) => <li key={message}>{message}</li>)}</ul>
             <span>Your choice is kept, so you can press Plant it to try again.</span>
@@ -80,7 +80,7 @@ export default function PlantSomethingModal({garden, iconUrl, onClose, onCreated
               <dd className="crop-confirm-name">
                 {crop.name}
                 <button type="button" className="btn btn-sm btn-outline-secondary" onClick={() => setCrop(null)} disabled={saving}>
-                  <i className="fa fa-edit" aria-hidden="true" /> Change<span className="visually-hidden"> crop</span>
+                  <i className="fas fa-edit" aria-hidden="true" /> Change<span className="visually-hidden"> crop</span>
                 </button>
               </dd>
               <dt>Garden</dt>
@@ -98,7 +98,7 @@ export default function PlantSomethingModal({garden, iconUrl, onClose, onCreated
         <button type="button" className="btn btn-link" onClick={onClose} disabled={saving}>Cancel</button>
         {crop && (
           <button ref={confirmButton} type="button" className="btn btn-success btn-plant" onClick={confirm} disabled={saving} aria-busy={saving}>
-            {saving ? <><i className="fa fa-spinner fa-spin" aria-hidden="true" /> Planting…</> : 'Plant it'}
+            {saving ? <><i className="fas fa-spinner fa-spin" aria-hidden="true" /> Planting…</> : 'Plant it'}
           </button>
         )}
       </div>
diff --git a/app/javascript/components/PlantedDate.jsx b/app/javascript/components/PlantedDate.jsx
index ccec8aa1d..722023778 100644
--- a/app/javascript/components/PlantedDate.jsx
+++ b/app/javascript/components/PlantedDate.jsx
@@ -73,7 +73,7 @@ export default function PlantedDate({planting, onUpdated}) {
     return (
       <button type="button" className="planting-row-planted planting-date-button" onClick={open} title="Change the planted date">
         {plantedAt ? `Planted ${formatDate(plantedAt)}` : 'Set planted date'}
-        <i className="fa fa-pencil" aria-hidden="true" />
+        <i className="fas fa-pencil" aria-hidden="true" />
       </button>
     );
   }
@@ -91,10 +91,10 @@ export default function PlantedDate({planting, onUpdated}) {
         onKeyDown={onKeyDown}
       />
       <button type="button" className="btn btn-sm btn-link" onClick={save} disabled={saving || !value} aria-label="Save planted date">
-        <i className="fa fa-check" aria-hidden="true" />
+        <i className="fas fa-check" aria-hidden="true" />
       </button>
       <button type="button" className="btn btn-sm btn-link" onClick={cancel} disabled={saving} aria-label="Cancel">
-        <i className="fa fa-times" aria-hidden="true" />
+        <i className="fas fa-times" aria-hidden="true" />
       </button>
       {error && <small className="planting-date-error" role="alert">{error}</small>}
     </span>
diff --git a/app/javascript/components/PlantingRow.jsx b/app/javascript/components/PlantingRow.jsx
index b0798c3b5..f91388a42 100644
--- a/app/javascript/components/PlantingRow.jsx
+++ b/app/javascript/components/PlantingRow.jsx
@@ -17,7 +17,7 @@ export default function PlantingRow({planting, defaultIconUrl, highlighted, high
         <div className="planting-row-chip">
           <PlantingChip planting={planting} defaultIconUrl={defaultIconUrl} highlighted={highlighted && highlightKind === 'added'} handlers={handlers} />
           {highlighted && highlightKind === 'harvested' && (
-            <span className="harvest-recorded-tag"><i className="fa fa-check" aria-hidden="true" /> Harvest recorded</span>
+            <span className="harvest-recorded-tag"><i className="fas fa-check" aria-hidden="true" /> Harvest recorded</span>
           )}
         </div>
         <PlantedDate planting={planting} onUpdated={onUpdated} />
diff --git a/app/javascript/components/RecordHarvestModal.jsx b/app/javascript/components/RecordHarvestModal.jsx
index 0067565d3..050eb6417 100644
--- a/app/javascript/components/RecordHarvestModal.jsx
+++ b/app/javascript/components/RecordHarvestModal.jsx
@@ -146,7 +146,7 @@ export default function RecordHarvestModal({planting, iconUrl, onClose, onSaved}
         </div>
       )}
       {!loadError && !values && (
-        <div className="modal-body" role="status"><i className="fa fa-spinner fa-spin" aria-hidden="true" /> Loading…</div>
+        <div className="modal-body" role="status"><i className="fas fa-spinner fa-spin" aria-hidden="true" /> Loading…</div>
       )}
       {values && step === 1 && (
         <div className="modal-body plant-dialog-body">
@@ -160,7 +160,7 @@ export default function RecordHarvestModal({planting, iconUrl, onClose, onSaved}
             <Steps steps={STEPS} current={step} />
             {errors.length > 0 && (
               <div className="alert alert-danger" role="alert">
-                <i className="fa fa-exclamation-triangle" aria-hidden="true" />{' '}
+                <i className="fas fa-exclamation-triangle" aria-hidden="true" />{' '}
                 <strong>That didn&rsquo;t save.</strong>
                 <ul className="mb-0">{errors.map((message) => <li key={message}>{message}</li>)}</ul>
                 <span>What you entered is kept, so you can press Save harvest to try again.</span>
@@ -175,7 +175,7 @@ export default function RecordHarvestModal({planting, iconUrl, onClose, onSaved}
                 <dd className={step === 2 ? 'crop-confirm-name' : undefined}>
                   {part.name}
                   <button type="button" className="btn btn-sm btn-outline-secondary ms-3" onClick={() => setStep(1)} disabled={saving}>
-                    <i className="fa fa-edit" aria-hidden="true" /> Change<span className="visually-hidden"> plant part</span>
+                    <i className="fas fa-edit" aria-hidden="true" /> Change<span className="visually-hidden"> plant part</span>
                   </button>
                 </dd>
                 {step > 2 && (
@@ -184,7 +184,7 @@ export default function RecordHarvestModal({planting, iconUrl, onClose, onSaved}
                     <dd>
                       {amount()}
                       <button type="button" className="btn btn-sm btn-outline-secondary ms-3" onClick={() => setStep(2)} disabled={saving}>
-                        <i className="fa fa-edit" aria-hidden="true" /> Change<span className="visually-hidden"> amount</span>
+                        <i className="fas fa-edit" aria-hidden="true" /> Change<span className="visually-hidden"> amount</span>
                       </button>
                     </dd>
                   </>
@@ -195,7 +195,7 @@ export default function RecordHarvestModal({planting, iconUrl, onClose, onSaved}
                     <dd>
                       {whenLabel()}
                       <button type="button" className="btn btn-sm btn-outline-secondary ms-3" onClick={() => setStep(3)} disabled={saving}>
-                        <i className="fa fa-edit" aria-hidden="true" /> Change<span className="visually-hidden"> when</span>
+                        <i className="fas fa-edit" aria-hidden="true" /> Change<span className="visually-hidden"> when</span>
                       </button>
                     </dd>
                   </>
@@ -316,7 +316,7 @@ export default function RecordHarvestModal({planting, iconUrl, onClose, onSaved}
             {step < STEPS.length && <button type="submit" className="btn btn-success btn-plant">Next</button>}
             {step === STEPS.length && (
               <button type="submit" className="btn btn-success btn-plant" disabled={saving || !harvestedAt} aria-busy={saving}>
-                {saving ? <><i className="fa fa-spinner fa-spin" aria-hidden="true" /> Saving…</> : 'Save harvest'}
+                {saving ? <><i className="fas fa-spinner fa-spin" aria-hidden="true" /> Saving…</> : 'Save harvest'}
               </button>
             )}
           </div>
diff --git a/app/javascript/components/SaveSeedsModal.jsx b/app/javascript/components/SaveSeedsModal.jsx
index 394f21401..f9baf9d6d 100644
--- a/app/javascript/components/SaveSeedsModal.jsx
+++ b/app/javascript/components/SaveSeedsModal.jsx
@@ -88,7 +88,7 @@ export default function SaveSeedsModal({planting, iconUrl, onClose, onSaved}) {
 
   const change = (toStep, what) => (
     <button type="button" className="btn btn-sm btn-outline-secondary ms-3" onClick={() => setStep(toStep)} disabled={saving}>
-      <i className="fa fa-edit" aria-hidden="true" /> Change<span className="visually-hidden"> {what}</span>
+      <i className="fas fa-edit" aria-hidden="true" /> Change<span className="visually-hidden"> {what}</span>
     </button>
   );
 
@@ -100,7 +100,7 @@ export default function SaveSeedsModal({planting, iconUrl, onClose, onSaved}) {
         </div>
       )}
       {!loadError && !values && (
-        <div className="modal-body" role="status"><i className="fa fa-spinner fa-spin" aria-hidden="true" /> Loading…</div>
+        <div className="modal-body" role="status"><i className="fas fa-spinner fa-spin" aria-hidden="true" /> Loading…</div>
       )}
       {values && (
         <form onSubmit={save}>
@@ -108,7 +108,7 @@ export default function SaveSeedsModal({planting, iconUrl, onClose, onSaved}) {
             <Steps steps={STEPS} current={step} />
             {errors.length > 0 && (
               <div className="alert alert-danger" role="alert">
-                <i className="fa fa-exclamation-triangle" aria-hidden="true" />{' '}
+                <i className="fas fa-exclamation-triangle" aria-hidden="true" />{' '}
                 <strong>That didn&rsquo;t save.</strong>
                 <ul className="mb-0">{errors.map((message) => <li key={message}>{message}</li>)}</ul>
                 <span>What you entered is kept, so you can press Save seeds to try again.</span>
@@ -136,7 +136,7 @@ export default function SaveSeedsModal({planting, iconUrl, onClose, onSaved}) {
               <div className="crop-picker">
                 <label htmlFor="save-seeds-quantity" className="crop-picker-label">About how many seeds?</label>
                 <div className="crop-picker-field">
-                  <i className="fa fa-seedling crop-picker-icon" aria-hidden="true" />
+                  <i className="fas fa-seedling crop-picker-icon" aria-hidden="true" />
                   <input
                     id="save-seeds-quantity"
                     type="number"
@@ -226,7 +226,7 @@ export default function SaveSeedsModal({planting, iconUrl, onClose, onSaved}) {
             {step < STEPS.length && <button type="submit" className="btn btn-success btn-plant">Next</button>}
             {step === STEPS.length && (
               <button type="submit" className="btn btn-success btn-plant" disabled={saving} aria-busy={saving}>
-                {saving ? <><i className="fa fa-spinner fa-spin" aria-hidden="true" /> Saving…</> : 'Save seeds'}
+                {saving ? <><i className="fas fa-spinner fa-spin" aria-hidden="true" /> Saving…</> : 'Save seeds'}
               </button>
             )}
           </div>
diff --git a/app/javascript/components/StarRating.jsx b/app/javascript/components/StarRating.jsx
index f9ff7d5b3..131077f76 100644
--- a/app/javascript/components/StarRating.jsx
+++ b/app/javascript/components/StarRating.jsx
@@ -31,7 +31,7 @@ export default function StarRating({id, label, value, onChange}) {
               title={WORDS[number] ? `${number} – ${WORDS[number]}` : `${number} of 5`}
               onMouseEnter={() => setHovered(number)}
             >
-              <i className={`${number <= lit ? 'fa' : 'far'} fa-star`} aria-hidden="true" />
+              <i className={`${number <= lit ? 'fas' : 'far'} fa-star`} aria-hidden="true" />
               <span className="visually-hidden">{number} of 5{WORDS[number] ? `, ${WORDS[number]}` : ''}</span>
             </label>
           </React.Fragment>
diff --git a/app/javascript/components/Steps.jsx b/app/javascript/components/Steps.jsx
index 6f2fa835f..35bb3b6ba 100644
--- a/app/javascript/components/Steps.jsx
+++ b/app/javascript/components/Steps.jsx
@@ -11,7 +11,7 @@ export default function Steps({steps, current}) {
         return (
           <li key={label} className={`plant-step plant-step-${state}`} aria-current={state === 'current' ? 'step' : undefined}>
             <span className="plant-step-number">
-              {state === 'done' ? <i className="fa fa-check" aria-hidden="true" /> : number}
+              {state === 'done' ? <i className="fas fa-check" aria-hidden="true" /> : number}
             </span>
             {label}
             {state === 'done' && <span className="visually-hidden"> (done)</span>}
diff --git a/app/views/crops/_predictions.html.haml b/app/views/crops/_predictions.html.haml
index a1f19d0d1..93b160917 100644
--- a/app/views/crops/_predictions.html.haml
+++ b/app/views/crops/_predictions.html.haml
@@ -29,7 +29,7 @@
       .card-body.text-center
         %h3 Median lifespan
         %strong= in_weeks(crop.median_lifespan)
-        %i.fas.fa-sun-o.fa-5x.pt-3.amber-text
+        %i.fas.fa-sun.fa-5x.pt-3.amber-text
         %span #{'week'.pluralize(in_weeks(crop.median_lifespan))}
 
   - if crop.median_days_to_first_harvest.present?