diff --git a/init.d/basics/appearance.el b/init.d/basics/appearance.el
index 724aff9..44f2534 100644
--- a/init.d/basics/appearance.el
+++ b/init.d/basics/appearance.el
@@ -33,7 +33,7 @@
 
 ;; Icon font (required by doom and others).
 (use-package all-the-icons
-  :pin melpa            ; We need > 3.2.0 for all-the-icons-ivy-rich (issue #4).
+  ;; :pin melpa            ; We need > 3.2.0 for all-the-icons-ivy-rich (issue #4).
   :init (defun my/font-installed-p (font-name)
           "Check if font with FONT-NAME is available."
           (if (find-font (font-spec :name font-name))
diff --git a/init.d/basics/buffers.el b/init.d/basics/buffers.el
index dd7879d..d868d61 100644
--- a/init.d/basics/buffers.el
+++ b/init.d/basics/buffers.el
@@ -1,6 +1,6 @@
 ;;; buffers.el --- Default settings for buffers. -*- lexical-binding: t; -*-
 
-;; Time-stamp: <2020-03-10T14:01:00+0100>
+;; Time-stamp: <2020-03-15T14:28:55+0100>
 
 ;;; Commentary:
 ;; * Setup scratch buffer.
@@ -11,7 +11,6 @@
 ;;; Code:
 
 (use-package emacs
-  :ensure nil
   :custom ((initial-scratch-message nil)   ; Make scratch buffer empty,
            (initial-major-mode 'gfm-mode)) ; and select mode.
   :config (progn
@@ -67,7 +66,7 @@
 
 ;; Dedicate windows to “purposes”.
 (use-package window-purpose
-  :pin melpa  ; We need > 1.7 <https://github.com/bmag/emacs-purpose/issues/158>
+  ;; :pin melpa  ; We need > 1.7 <https://github.com/bmag/emacs-purpose/issues/158>
   :defer nil
   :config (progn
             (purpose-mode)
@@ -98,7 +97,7 @@
 
 ;; Highlight which buffer is active by dimming the others.
 (use-package dimmer
-  :pin melpa                            ; We need > 0.4.2 for configure-magit.
+  ;; :pin melpa                            ; We need > 0.4.2 for configure-magit.
   :config (progn
             (dimmer-configure-which-key)
             (dimmer-configure-magit)
diff --git a/init.d/basics/global-variables.el b/init.d/basics/global-variables.el
index c227a42..563e84a 100644
--- a/init.d/basics/global-variables.el
+++ b/init.d/basics/global-variables.el
@@ -1,6 +1,6 @@
 ;;; global-variables.el --- Set some global variables. -*- lexical-binding: t; -*-
 
-;; Time-stamp: <2020-03-13T11:17:28+0100>
+;; Time-stamp: <2020-03-15T14:28:25+0100>
 
 ;;; Commentary:
 ;; * Banish customizations.
@@ -14,7 +14,6 @@
 ;;; Code:
 
 (use-package emacs
-  :ensure nil
   :diminish abbrev-mode
   :diminish auto-fill-function
   ;; Banish customizations to another file.
diff --git a/init.d/basics/input.el b/init.d/basics/input.el
index a3432cf..8c43622 100644
--- a/init.d/basics/input.el
+++ b/init.d/basics/input.el
@@ -1,6 +1,6 @@
 ;;; input.el --- Configure behaviour of input devices. -*- lexical-binding: t; -*-
 
-;; Time-stamp: <2020-03-10T13:42:34+0100>
+;; Time-stamp: <2020-03-15T14:28:13+0100>
 
 ;;; Commentary:
 ;; * Setup mouse & keyboard behaviour.
@@ -9,7 +9,6 @@
 ;;; Code:
 
 (use-package emacs
-  :ensure nil
   :custom ((mouse-wheel-scroll-amount '(1 ((shift) . 1))) ; Scroll 1 line.
            ;; Paste text where the cursor is, not where the mouse is.
            (mouse-yank-at-point t)
diff --git a/init.d/basics/package-management.el b/init.d/basics/package-management.el
index 733890e..805a78e 100644
--- a/init.d/basics/package-management.el
+++ b/init.d/basics/package-management.el
@@ -1,6 +1,6 @@
 ;;; package-management.el --- Initialize package management.  -*- lexical-binding: t; -*-
 
-;; Time-stamp: <2020-03-11T16:10:53+0100>
+;; Time-stamp: <2020-03-15T15:39:49+0100>
 
 ;;; Commentary:
 ;; * Set up package sources and their priorities.
@@ -12,40 +12,50 @@
 
 ;;; Code:
 
-(require 'package)
-(add-to-list 'package-archives
-             '("melpa-stable" . "https://stable.melpa.org/packages/") t)
-(add-to-list 'package-archives
-             '("melpa" . "https://melpa.org/packages/") t)
-(setq package-archive-priorities '(("melpa-stable" . 30)
-                                   ("gnu"          . 20)
-                                   ("melpa"        . 10)))
+(setq straight-repository-branch "develop")
+(customize-set-variable
+ 'straight-use-package-by-default t
+ "Makes use-package invoke straight.el to install the package.")
+(customize-set-variable 'straight-cache-autoloads t
+                        "Cache the autoloads of all packages in a single file.")
+
+(defvar bootstrap-version)
+(let ((bootstrap-file
+       (expand-file-name "straight/repos/straight.el/bootstrap.el" user-emacs-directory))
+      (bootstrap-version 5))
+  (unless (file-exists-p bootstrap-file)
+    (with-current-buffer
+        (url-retrieve-synchronously
+         "https://raw.githubusercontent.com/raxod502/straight.el/develop/install.el"
+         'silent 'inhibit-cookies)
+      (goto-char (point-max))
+      (eval-print-last-sexp)))
+  (load bootstrap-file nil 'nomessage))
+
+(add-hook 'after-init-hook #'straight-prune-build)
 
 ;; Workaround for 26.2 <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34341>.
 (when (< emacs-major-version 27)
   (defvar gnutls-algorithm-priority "NORMAL:-VERS-TLS1.3"))
 
-(when (< emacs-major-version 27)
-  (package-initialize))
+;; Isolate package configurations.
+(straight-use-package 'use-package)
 
-;; Add path for custom packages.
-(add-to-list 'load-path (concat user-emacs-directory "custom-packages/"))
+(defun my/straight-pull-all-maybe ()
+  "Run `straight-pull-all' if 7 days have passed since the build cache was modified."
+  (let ((days 7))
+    (if (> (- (time-to-seconds)
+              (time-to-seconds
+               (file-attribute-modification-time
+                (file-attributes (expand-file-name "straight/build-cache.el"
+                                                   user-emacs-directory)))))
+           (* 60 60 24 days))
+        (straight-pull-all))))
 
-;; Install use-package if necessary.
-(unless (package-installed-p 'use-package)
-  (package-refresh-contents)
-  (package-install 'use-package))
-(eval-when-compile
-  (require 'use-package))
-
-;; Always install packages if they are not present.
-(use-package use-package
-  :custom (use-package-always-ensure t))
-
-;; Autocompile files on load.
-(use-package auto-compile
-  :custom (load-prefer-newer t)         ; Use uncompiled file if it is newer.
-  :config (auto-compile-on-load-mode))
+;; ;; Autocompile files on load.
+;; (use-package auto-compile
+;;   :custom (load-prefer-newer t)         ; Use uncompiled file if it is newer.
+;;   :config (auto-compile-on-load-mode))
 
 ;; Tool for updating the GNU ELPA keyring.
 (use-package gnu-elpa-keyring-update
@@ -60,47 +70,5 @@
   (if (> (- (time-to-seconds) my/keyring-last-access) (* 60 60 24 7))
       (gnu-elpa-keyring-update)))
 
-;; Update packages if at least 7 days have passed.
-(use-package auto-package-update
-  :after (quelpa)
-  :demand t
-  :defines (quelpa-cache)
-  :custom ((auto-package-update-delete-old-versions t)
-           (auto-package-update-interval 7)
-           (auto-package-update-hide-results nil))
-  :config (progn
-            (auto-package-update-maybe)
-            (defvar my/tmp--package-activated-list nil)
-            (defun my/apu-delete-quelpa-packages ()
-              "Delete quelpa packages from `package-activated-list'."
-              (setq my/tmp--package-activated-list package-activated-list)
-              (dolist (package quelpa-cache)
-                (let ((package-name (car package)))
-                  (setq package-activated-list
-                        (delq package-name package-activated-list)))))
-            (defun my/apu-restore-quelpa-packages ()
-              "Restore quelpa packages to `package-activated-list'."
-              (if my/tmp--package-activated-list
-                  (setq package-activated-list my/tmp--package-activated-list)
-                (message "Error: Could not restore `package-activated-list'."))
-              (setq my/tmp--package-activated-list nil)))
-  :hook ((auto-package-update-before . my/apu-delete-quelpa-packages)
-         (auto-package-update-after  . my/apu-restore-quelpa-packages)))
-
-;; Install Emacs packages directly from source.
-(use-package quelpa
-  :demand t
-  :custom ((quelpa-self-upgrade-p nil)
-           (quelpa-update-melpa-p nil)
-           (quelpa-checkout-melpa-p nil)
-           (quelpa-upgrade-interval 7))
-  :hook (after-init . quelpa-upgrade-all-maybe))
-
-;; Use :quelpa in use-package configurations.
-(use-package quelpa-use-package
-  :after (use-package quelpa)
-  ; Override `use-package-always-ensure' for quelpa-packages.
-  :config (quelpa-use-package-activate-advice))
-
 (provide 'basics/package-management)
 ;;; package-management.el ends here
diff --git a/init.d/basics/ui.el b/init.d/basics/ui.el
index 094644c..9acfce1 100644
--- a/init.d/basics/ui.el
+++ b/init.d/basics/ui.el
@@ -1,6 +1,6 @@
 ;;; ui.el --- Configure user interfaces. -*- lexical-binding: t; -*-
 
-;; Time-stamp: <2020-03-10T23:26:19+0100>
+;; Time-stamp: <2020-03-15T15:21:36+0100>
 
 ;;; Commentary:
 ;; * treemacs
@@ -10,7 +10,7 @@
 
 ;; Directory tree.
 (use-package treemacs
-  :pin melpa                            ; We need > 2.6 for lsp-treemacs.
+  ;; :pin melpa                            ; We need > 2.6 for lsp-treemacs.
   :demand t
   :after (display-line-numbers)
   :custom ((treemacs-project-follow-cleanup t) ; Collapse projects when leaving.
@@ -26,8 +26,8 @@
   :after (treemacs projectile))
 
 (use-package treemacs-magit
-  :after (treemacs magit)
-  :pin melpa)                           ; Compatibility with treemacs-vcs.
+  ;; :pin melpa                            ; See treemacs.
+  :after (treemacs magit))
 
 ;; Completion in many Emacs commands.
 (use-package ivy
diff --git a/init.d/net/server.el b/init.d/net/server.el
index 11d72ad..77e9049 100644
--- a/init.d/net/server.el
+++ b/init.d/net/server.el
@@ -1,6 +1,6 @@
 ;;; server.el --- Set up network stuff.. -*- lexical-binding: t; -*-
 
-;; Time-stamp: <2020-02-27T06:05:32+0100>
+;; Time-stamp: <2020-03-15T16:40:58+0100>
 
 ;;; Commentary:
 
@@ -11,6 +11,7 @@
 ;; Edit remote files.
 (unless slow-computer
   (use-package tramp
+    :straight nil
     :defer 5
 
     :custom
diff --git a/init.d/programming/c++.el b/init.d/programming/c++.el
index 8b1a23a..5286073 100644
--- a/init.d/programming/c++.el
+++ b/init.d/programming/c++.el
@@ -1,6 +1,6 @@
 ;;; c++.el --- C++ settings. -*- lexical-binding: t; -*-
 
-;; Time-stamp: <2020-02-18T17:04:30+0100>
+;; Time-stamp: <2020-03-15T14:29:24+0100>
 
 ;;; Commentary:
 
@@ -11,7 +11,7 @@
 
 (unless slow-computer
   (use-package flycheck-clang-tidy
-    :pin melpa
+    ;; :pin melpa
     :after (flycheck projectile lsp-ui)
     :if (executable-find "clang-tidy")
     ;; clang-tidy is built into clangd >= 9.
@@ -126,7 +126,7 @@
 
 ;; Add #include directives for missing symbols.
 (use-package clang-include-fixer
-  :ensure nil                           ; Installed by clang.
+  :straight nil                         ; Installed by clang.
   :if (executable-find "clang-include-fixer")
   :functions (clang-include-fixer--start clang-include-fixer--add-header)
 
diff --git a/init.d/programming/common.el b/init.d/programming/common.el
index 0be838e..d77803d 100644
--- a/init.d/programming/common.el
+++ b/init.d/programming/common.el
@@ -1,6 +1,6 @@
 ;;; common.el --- Common programming settings. -*- lexical-binding: t; -*-
 
-;; Time-stamp: <2020-03-10T12:56:35+0100>
+;; Time-stamp: <2020-03-15T14:29:38+0100>
 
 ;;; Commentary:
 
@@ -9,7 +9,6 @@
 (require 'basics/global-variables)
 
 (use-package emacs
-  :ensure nil
   :defines (compilation-mode-map)
   :custom (compilation-scroll-output 'first-error)
   :config (progn
diff --git a/init.d/programming/elisp.el b/init.d/programming/elisp.el
index 675e857..9c8dcc0 100644
--- a/init.d/programming/elisp.el
+++ b/init.d/programming/elisp.el
@@ -9,7 +9,7 @@
 ;; Checker for the metadata in Emacs Lisp files.
 (use-package flycheck-package
   :after (flycheck)
-  :pin melpa
+  ;; :pin melpa
   :config (flycheck-package-setup))
 
 (provide 'programming/elisp)
diff --git a/init.d/programming/git.el b/init.d/programming/git.el
index de070d3..3cb394e 100644
--- a/init.d/programming/git.el
+++ b/init.d/programming/git.el
@@ -11,12 +11,12 @@
 ;; Git integration.
 (use-package git-commit
   :defer 5
-  :pin melpa
+  ;; :pin melpa
   )
 
 (unless slow-computer
   (use-package magit
-    :pin melpa
+    ;; :pin melpa
 
     :custom
     (magit-diff-refine-hunk 'all)       ; Show word-granularity differences.
@@ -45,7 +45,7 @@
 
   ;; Use libgit rather than git.
   (use-package magit-libgit
-    :pin melpa
+    ;; :pin melpa
     )
 
   ;; Show TODOs in magit-status.
@@ -62,7 +62,7 @@
 
   ;; Work with Git forges from Magit.
   (use-package forge
-    :pin melpa                       ; <https://github.com/magit/forge/issues/8>
+    ;; :pin melpa                       ; <https://github.com/magit/forge/issues/8>
 
     :after magit
 
diff --git a/init.d/text/common.el b/init.d/text/common.el
index 9c6c8bf..6e59b36 100644
--- a/init.d/text/common.el
+++ b/init.d/text/common.el
@@ -1,6 +1,6 @@
 ;;; common.el --- Common settings for text files. -*- lexical-binding: t; -*-
 
-;; Time-stamp: <2020-03-08T07:34:25+0100>
+;; Time-stamp: <2020-03-15T23:37:37+0100>
 
 ;;; Commentary:
 
@@ -9,8 +9,6 @@
 (require 'basics/global-variables)
 
 (use-package emacs
-  :ensure nil
-
   :custom
   (require-final-newline t)            ; Always add newline at end of file.
   (fill-column 80)                     ; Documents are 80 chars wide by default.
@@ -21,7 +19,7 @@
   ("C-S-r" . point-to-register)         ; Store location of point in register.
   ("M-W" . copy-to-register)            ; Store text in register.
   ("C-S-y" . insert-register)           ; Insert text from register.
-  ("C-<f7>" . list-registers)           ; List all registers.
+  ("M-<f7>" . list-registers)           ; List all registers.
 
   :hook
   (text-mode . auto-fill-mode)          ; Enable word-wrapping at fill-column.
@@ -29,13 +27,16 @@
 
 ;; Quickly jump to next/previous register.
 (use-package register-quicknav
-  :quelpa (register-quicknav
-           :fetcher git
-           :url "https://schlomp.space/tastytea/register-quicknav.git")
+  :straight (register-quicknav
+             :type git
+             :repo "https://schlomp.space/tastytea/register-quicknav.git"
+             :branch "main")
+  ;;         ^^^^^^^ See <https://github.com/raxod502/straight.el/issues/279>.
   :custom (register-quicknav-buffer-only t)
-  :bind (("C-<f5>" . register-quicknav-prev-register)
-         ("C-<f6>" . register-quicknav-next-register)
-         ("M-r"    . register-quicknav-clear-current-register))
+  :bind (("C-<f5>"   . register-quicknav-prev-register)
+         ("C-<f6>"   . register-quicknav-next-register)
+         ("C-<f7>"   . register-quicknav-point-to-unused-register)
+         ("C-S-<f7>" . register-quicknav-clear-current-register))
   )
 
 ;; Save cursor position.
@@ -175,7 +176,7 @@
   :after (yasnippet)
 
   :init
-  (defun my/autoinsert-yas-expand()
+  (defun my/autoinsert-yas-expand ()
     "Replace text in yasnippet template."
     (yas-minor-mode t)
     (yas-expand-snippet (buffer-string) (point-min) (point-max)))
diff --git a/init.d/text/latex.el b/init.d/text/latex.el
index f8e3e22..df2358e 100644
--- a/init.d/text/latex.el
+++ b/init.d/text/latex.el
@@ -1,13 +1,13 @@
 ;;; latex.el --- Settings for LaTeX. -*- lexical-binding: t; -*-
 
-;; Time-stamp: <2020-02-18T17:18:01+0100>
+;; Time-stamp: <2020-03-15T14:27:07+0100>
 
 ;;; Commentary:
 
 ;;; Code:
 
 (use-package tex-site
-  :ensure auctex
+  :straight auctex
   :if (executable-find "xetex")
   :functions (TeX-revert-document-buffer)
 
diff --git a/init.el b/init.el
index 10d72d8..a38186a 100644
--- a/init.el
+++ b/init.el
@@ -1,6 +1,6 @@
 ;;; init.el --- tastytea's Emacs init file. -*- lexical-binding: t; -*-
 
-;; Time-stamp: <2020-03-13T11:23:01+0100>
+;; Time-stamp: <2020-03-15T12:48:57+0100>
 
 ;;; Commentary:
 ;; Requires at least Emacs 26. Most of it will probably work with Emacs 24 and
@@ -8,8 +8,13 @@
 
 ;;; Code:
 
-;; Set garbage collection threshold to 20 MiB to speed up init.
-(setq gc-cons-threshold (* 20 1024 1024))
+;; early-init.el is automatically loaded in Emacs 27+.
+(when (< emacs-major-version 27)
+  (require 'early-init (expand-file-name "early-init.el" user-emacs-directory)))
+
+(customize-set-variable
+ 'gc-cons-threshold (* 20 1024 1024)
+ "Set garbage collection threshold to 20 MiB to speed up init.")
 
 ;; Add path to init files.
 (push (concat user-emacs-directory "init.d") load-path)
@@ -38,8 +43,9 @@
 (require 'net/server)
 (require 'net/client)
 
-;; Set garbage collection threshold to original value.
-(setq gc-cons-threshold (car (get 'gc-cons-threshold 'standard-value)))
+(customize-set-variable 'gc-cons-threshold
+                        (car (get 'gc-cons-threshold 'standard-value))
+                        "Set garbage collection threshold to original value.")
 
 (provide 'init)
 ;;; init.el ends here