diff --git a/oni/gexp.scm b/oni/gexp.scm
index 388c7a2..b0d9258 100644
--- a/oni/gexp.scm
+++ b/oni/gexp.scm
@@ -12,7 +12,7 @@ executable bit set. TEXT is a sequence of strings and file-like objects, as in:
   (define build
     (let ((text (if guile (drop text 2) text)))
       (gexp (call-with-output-file (ungexp output "out")
-              (lambda (port)
+              (λ (port)
                 (set-port-encoding! port "UTF-8")
                 (display (string-append (ungexp-splicing text)) port)
                 (chmod port #o555))))))
diff --git a/oni/home/services/dunst.scm b/oni/home/services/dunst.scm
index ae80be4..0f33637 100644
--- a/oni/home/services/dunst.scm
+++ b/oni/home/services/dunst.scm
@@ -218,7 +218,7 @@ horizontal axis.")
 (define (home-dunst-config-dunstrc config)
   (computed-file "dunstrc"
                  #~(call-with-output-file #$output
-                     (lambda (port)
+                     (λ (port)
                        (display #$(serialize-dunst-configuration config)
                                 port)))))
 
diff --git a/oni/home/services/guile.scm b/oni/home/services/guile.scm
index f6f2580..372741f 100644
--- a/oni/home/services/guile.scm
+++ b/oni/home/services/guile.scm
@@ -45,7 +45,7 @@
 (define (home-guile-config-file config)
   (computed-file "guile"
                  #~(call-with-output-file #$output
-                     (lambda (port)
+                     (λ (port)
                        (display #$(serialize-guile-configuration config) port)))))
 
 (define (home-guile-config-files config)
diff --git a/oni/home/services/herbstluftwm.scm b/oni/home/services/herbstluftwm.scm
index 70aa916..306e497 100644
--- a/oni/home/services/herbstluftwm.scm
+++ b/oni/home/services/herbstluftwm.scm
@@ -55,7 +55,7 @@
 (define (build-keybindings bindings)
   (append
    (list "herbstclient keyunbind --all\n")
-   (map (lambda (binding)
+   (map (λ (binding)
           (format #f "herbstclient keybind ~a ~a\n"
                   (kbd (car binding)) (cdr binding)))
         bindings)))
@@ -70,18 +70,16 @@
                     (home-herbstluftwm-configuration-key-bindings config))
 
                    (list "herbstclient mouseunbind --all\n")
-                   (map (lambda (binding)
+                   (map (λ (binding)
                           (format #f "herbstclient mousebind ~a ~a\n"
                                   (kbd (car binding)) (cdr binding)))
                         (home-herbstluftwm-configuration-mouse-bindings config))
-                   (map (lambda (setting)
+                   (map (λ (setting)
                           (format #f "herbstclient set ~s ~s\n"
                                   (car setting) (cdr setting)))
                         (home-herbstluftwm-configuration-settings config))
-                   (map (lambda (tag)
-                          (format #f "herbstclient add ~s\n" tag))
-                        tags)
-                   (map (lambda (key tag)
+                   (map (λ (tag) (format #f "herbstclient add ~s\n" tag)) tags)
+                   (map (λ (key tag)
                           (format #f "herbstclient keybind Mod4-~a use ~s\n" key tag))
                         (take (home-herbstluftwm-configuration-tag-keys config)
                               (length tags))
@@ -89,26 +87,25 @@
                    (if (> (length tags) 0)
                        (list (format #f "herbstclient use ~s\nherbstclient merge_tag default ~s\n" (car tags) (car tags)))
                        '())
-                   (map (lambda (attribute-pair)
+                   (map (λ (attribute-pair)
                           (format #f "herbstclient attr ~a ~s\n"
                                   (string-join (map symbol->string (car attribute-pair)) ".")
                                   (cdr attribute-pair)))
                         (home-herbstluftwm-configuration-attributes config))
                    (list "herbstclient unrule -F\n")
-                   (map (lambda (rule)
+                   (map (λ (rule)
                           (format #f "herbstclient rule ~a\n"
                                   (string-join rule " ")))
                         (home-herbstluftwm-configuration-rules config))
                    (list "herbstclient unlock\n"
                          (format #f "herbstclient pad ~a\n"
                                  (string-join (map number->string (home-herbstluftwm-configuration-padding config)) " ")))
-                   (map (lambda (layout-pair)
+                   (map (λ (layout-pair)
                           (format #f "herbstclient load ~s '~s'\n"
                                   (car layout-pair)
                                   (cdr layout-pair)))
                         (home-herbstluftwm-configuration-layouts config))
-                   (map (lambda (line)
-                          (format #f "herbstclient ~a\n" line))
+                   (map (λ (line) (format #f "herbstclient ~a\n" line))
                         (home-herbstluftwm-configuration-extra config))))))
 
 (define (add-herbstluftwm-executable config)
diff --git a/oni/home/services/mpd.scm b/oni/home/services/mpd.scm
index 682d988..b59cb41 100644
--- a/oni/home/services/mpd.scm
+++ b/oni/home/services/mpd.scm
@@ -52,7 +52,7 @@
 
 (define (home-mpd-audio-output-list? value)
   (and (list? value)
-       (every (lambda (v) (is-a? v <home-mpd-audio-output>)) value)))
+       (every (λ (v) (is-a? v <home-mpd-audio-output>)) value)))
 
 (define-maybe string)
 (define-maybe home-mpd-audio-output-list)
diff --git a/oni/home/services/picom.scm b/oni/home/services/picom.scm
index 332ad89..723895d 100644
--- a/oni/home/services/picom.scm
+++ b/oni/home/services/picom.scm
@@ -34,7 +34,7 @@
    (symbol->string field)
    ": {\n"
    (apply string-append
-          (map (lambda (type)
+          (map (λ (type)
                  (string-append
                   "  "
                   (symbol->string (car type))
@@ -44,7 +44,7 @@
                     (string-append
                      "{ "
                      (apply string-append
-                            (map (lambda (option)
+                            (map (λ (option)
                                    (string-append (symbol->string (car option)) " = " (if (cdr option) "true" "false")))
                                  (cdr type)))
                      " },"))
@@ -61,7 +61,7 @@
 
 (define (serialize-list field value)
   (string-append (symbol->string field) " = [\n"
-                 (apply string-append (map (lambda (item)
+                 (apply string-append (map (λ (item)
                                              (string-append "  \"" item "\",\n"))
                                            value))
                  "];\n"))
@@ -166,7 +166,7 @@
   (computed-file
    "picom.conf"
    #~(call-with-output-file #$output
-       (lambda (port)
+       (λ (port)
          (display #$(serialize-configuration config home-picom-configuration-fields) port)))))
 
 (define (home-picom-files-service config)
diff --git a/oni/home/services/rofi.scm b/oni/home/services/rofi.scm
index 2cb85df..b3fa65f 100644
--- a/oni/home/services/rofi.scm
+++ b/oni/home/services/rofi.scm
@@ -95,18 +95,18 @@
    "\n}\n")))
 
 (define (format-rofi-theme theme)
-  (let ((keys (map (lambda (s)
+  (let ((keys (map (λ (s)
                      (if (symbol? s)
                          (symbol->string s)
                          (object->string s)))
                    (butlast theme 1)))
         (values (car (list-tail theme (- (length theme) 1)))))
-   (string-append (string-join keys ", ")
-                  " {\n  "
-                  (string-join
-                   (map format-rofi-config values)
-                   "\n  ")
-                  "\n}\n")))
+    (string-append (string-join keys ", ")
+                   " {\n  "
+                   (string-join
+                    (map format-rofi-config values)
+                    "\n  ")
+                   "\n}\n")))
 
 (define (serialize-rofi-theme theme)
   (string-join (map format-rofi-theme theme) "\n"))
diff --git a/oni/home/services/unclutter.scm b/oni/home/services/unclutter.scm
index 2230673..ba69d20 100644
--- a/oni/home/services/unclutter.scm
+++ b/oni/home/services/unclutter.scm
@@ -61,7 +61,7 @@
               (if (> (length buttons) 0)
                   (list
                    "--ignore-buttons"
-                   (string-join (map (lambda (i) (format #f "~s" i)) buttons) ","))
+                   (string-join (map (λ (i) (format #f "~s" i)) buttons) ","))
                   '())))
         #:log-file (format #f "~a/.local/var/log/unclutter.log" (getenv "HOME"))))
     (stop #~(make-kill-destructor)))))
diff --git a/oni/home/services/xbindkeys.scm b/oni/home/services/xbindkeys.scm
index f361594..67baad6 100644
--- a/oni/home/services/xbindkeys.scm
+++ b/oni/home/services/xbindkeys.scm
@@ -28,11 +28,11 @@
 
 (define (serialize-keymap parent keymap)
   (string-join
-   (let* ((prefixes (filter (lambda (pair) (list? (cdr pair))) keymap))
-          (others (filter (lambda (pair) (not (list? (cdr pair)))) keymap))
-          (names (map (lambda (_) (gensym)) prefixes)))
+   (let* ((prefixes (filter (λ (pair) (list? (cdr pair))) keymap))
+          (others (filter (λ (pair) (not (list? (cdr pair)))) keymap))
+          (names (map (λ (_) (gensym)) prefixes)))
      (append
-      (map (lambda (key-pair sym)
+      (map (λ (key-pair sym)
              (format #f "  (define (~s)\n  (ungrab-all-keys)\n  (remove-all-keys)\n  ~a\n  (xbindkey-function '(control g) (reset-higher-level-binding ~a))\n  (xbindkey-function '(Return) (reset-higher-level-binding ~a))\n  (xbindkey-function '(Escape) (reset-higher-level-binding ~a))\n  (grab-all-keys))\n"
                      sym
                      (serialize-keymap sym (cdr key-pair))
@@ -40,7 +40,7 @@
                      parent
                      parent))
            prefixes names)
-      (map (lambda (key-pair)
+      (map (λ (key-pair)
              (let ((key (car key-pair)))
                (format #f "  (xbindkey ~s ~s)\n  (xbindkey-function '(release ~s) (reset-higher-level-binding ~a))\n"
                        (if (string? key) key `(quote ,key))
@@ -54,27 +54,27 @@
   (apply mixed-text-file
          "xbindkeysrc.scm"
          "(define (reset-higher-level-binding level) (lambda () (ungrab-all-keys) (remove-all-keys) (level) (grab-all-keys)))\n"
-         (let* ((prefixes (filter (lambda (pair) (list? (cdr pair)))
+         (let* ((prefixes (filter (λ (pair) (list? (cdr pair)))
                                   (home-xbindkeys-configuration-keybindings config)))
-                (others (filter (lambda (pair) (not (list? (cdr pair))))
+                (others (filter (λ (pair) (not (list? (cdr pair))))
                                 (home-xbindkeys-configuration-keybindings config)))
-                (names (map (lambda (_) (gensym)) prefixes)))
+                (names (map (λ (_) (gensym)) prefixes)))
            (append
-            (map (lambda (key-pair sym)
+            (map (λ (key-pair sym)
                    (format #f "  (define (~s)\n  (ungrab-all-keys)\n  (remove-all-keys)\n  ~a\n  (xbindkey-function '(control g) (reset-higher-level-binding ~a))\n  (xbindkey-function '(Return) (reset-higher-level-binding ~a))\n  (xbindkey-function '(Escape) (reset-higher-level-binding ~a))\n  (grab-all-keys))\n"
-                     sym
-                     (serialize-keymap "first-binding" (cdr key-pair))
-                     'first-binding
-                     'first-binding
-                     'first-binding))
+                           sym
+                           (serialize-keymap "first-binding" (cdr key-pair))
+                           'first-binding
+                           'first-binding
+                           'first-binding))
                  prefixes names)
             (list "(define (first-binding)\n"
                   "  \"Top-level bindings\"\n")
-            (map (lambda (key-pair sym)
+            (map (λ (key-pair sym)
                    (let ((key (car key-pair)))
                      (format #f "(xbindkey-function ~s ~s)\n" (if (string? key) key `(quote ,key)) sym)))
                  prefixes names)
-            (map (lambda (key-pair)
+            (map (λ (key-pair)
                    (format #f "  (xbindkey (quote ~s) ~s) \n" (car key-pair) (cdr key-pair)))
                  others)
             (list "  )\n"
diff --git a/oni/kbd.scm b/oni/kbd.scm
index eb7f8d7..f6956f4 100644
--- a/oni/kbd.scm
+++ b/oni/kbd.scm
@@ -21,7 +21,7 @@
 (define (kbd str)
   (let ((parts (string-split str #\-)))
     (string-join
-     (fold-right (lambda (key previous)
+     (fold-right (λ (key previous)
                    (if (null? previous)
                        (list (convert-key key))
                        (cons (convert-modifier key) previous)))
diff --git a/oni/packages/emacs-config.scm b/oni/packages/emacs-config.scm
index 1e25de7..f1ddc88 100644
--- a/oni/packages/emacs-config.scm
+++ b/oni/packages/emacs-config.scm
@@ -290,8 +290,7 @@ Emacs")))
      `(#:phases
        (modify-phases %standard-phases
          (add-after 'unpack 'chdir-oni-bats
-           (lambda _
-             (chdir "oni-bats"))))
+           (λ _ (chdir "oni-bats"))))
        #:include '("\\.el$" "^snippets\\/bats-mode\\/")))
     (propagated-inputs
      `(("emacs-bats" ,emacs-bats)
@@ -309,8 +308,7 @@ Emacs")))
     `(#:phases
       (modify-phases %standard-phases
                      (add-after 'unpack 'chdir-oni-org
-                                (lambda _
-                                  (chdir "oni-org"))))
+                                (λ _ (chdir "oni-org"))))
       #:include '("\\.el$"
                   "^snippets\\/org-mode\\/"
                   "^capture-templates\\/"
@@ -458,7 +456,7 @@ Emacs")))
     `(#:phases
       (modify-phases %standard-phases
                      (add-after 'unpack 'chdir-oni-conf
-                                (lambda _ (chdir "oni-conf"))))
+                                (λ _ (chdir "oni-conf"))))
       #:include '("\\.el$"
                   "^snippets\\/conf-mode\\/")))
    (propagated-inputs
@@ -498,7 +496,7 @@ Emacs")))
     '(#:phases
       (modify-phases %standard-phases
                      (add-after 'unpack 'chdir-oni-csharp
-                                (lambda _ (chdir "oni-csharp"))))
+                                (λ _ (chdir "oni-csharp"))))
       #:include '("\\.el$" "^snippets\\/")))
    (propagated-inputs
     `(("emacs-csharp-mode" ,emacs-csharp-mode)
@@ -519,7 +517,7 @@ Emacs")))
     '(#:phases
       (modify-phases %standard-phases
                      (add-after 'unpack 'chdir-oni-css
-                                (lambda _ (chdir "oni-css"))))
+                                (λ _ (chdir "oni-css"))))
       #:include '("\\.el$" "^snippets\\/")))
    (propagated-inputs
     `(("emacs-oni-company" ,emacs-oni-company)
@@ -548,7 +546,7 @@ Emacs")))
      '(#:phases
        (modify-phases %standard-phases
          (add-after 'unpack 'chdir-oni-elisp
-           (lambda _ (chdir "oni-elisp"))))
+           (λ _ (chdir "oni-elisp"))))
        #:include '("\\.el$" "^snippets\\/")))
     (propagated-inputs
      `(("emacs-oni-company" ,emacs-oni-company)