diff --git a/README.md b/README.md
index ead6af6..40163fa 100644
--- a/README.md
+++ b/README.md
@@ -73,14 +73,6 @@ version is **4.3.11**.
 
 05. Open a new Zsh terminal window or tab.
 
-### [Fig](https://fig.io)
-
-Fig adds apps, shortcuts, and autocomplete to your existing terminal.
-
-Install `prezto` in just one click.
-
-<a href="https://fig.io/plugins/other/prezto" target="_blank"><img src="https://fig.io/badges/install-with-fig.svg" /></a>
-
 ### Troubleshooting
 
 If you are not able to find certain commands after switching to Prezto, modify
diff --git a/modules/history-substring-search/external b/modules/history-substring-search/external
index 400e58a..8dd05bf 160000
--- a/modules/history-substring-search/external
+++ b/modules/history-substring-search/external
@@ -1 +1 @@
-Subproject commit 400e58a87f72ecec14f783fbd29bc6be4ff1641c
+Subproject commit 8dd05bfcc12b0cd1ee9ea64be725b3d9f713cf64
diff --git a/modules/homebrew/init.zsh b/modules/homebrew/init.zsh
index 7899258..dd2b565 100644
--- a/modules/homebrew/init.zsh
+++ b/modules/homebrew/init.zsh
@@ -21,7 +21,17 @@ fi
 # Load 'HOMEBREW_' prefixed variables only. Avoid loading 'PATH' related
 # variables as they are already handled in standard zsh configuration.
 if (( $+commands[brew] )); then
-  eval "${(@M)${(f)"$(brew shellenv 2> /dev/null)"}:#export HOMEBREW*}"
+  cache_file="${XDG_CACHE_HOME:-$HOME/.cache}/prezto/brew-shellenv-cache.zsh"
+  if [[ "$commands[brew]" -nt "$cache_file" \
+      || "${ZDOTDIR:-$HOME}/.zpreztorc" -nt "$cache_file" \
+      || ! -s "$cache_file" ]]; then
+    mkdir -p "$cache_file:h"
+    # Cache the result.
+    echo "${(@M)${(f)"$(brew shellenv 2> /dev/null)"}:#export HOMEBREW*}" >! "$cache_file" 2> /dev/null
+  fi
+
+  source "$cache_file"
+  unset cache_file
 fi
 
 #
diff --git a/modules/osx/functions/trash b/modules/osx/functions/trash
new file mode 100644
index 0000000..0efa215
--- /dev/null
+++ b/modules/osx/functions/trash
@@ -0,0 +1,31 @@
+#
+# Moves files to the macOS trash.
+#
+
+# function trash {
+
+emulate -L zsh
+setopt LOCAL_OPTIONS EXTENDED_GLOB
+
+local file
+local -a files=()
+for file in $@; do
+  if [[ -e $file ]]; then
+    # ':a' gets the full path (do not use ':A', which would resolve symlinks)
+    files+=("the POSIX file \"${file:a}\"")
+  else
+    print "trash: No such file or directory '$file'." >&2
+    return 1
+  fi
+done
+
+if (( $#files == 0 )); then
+  print 'usage: trash <files...>' >&2
+  return 64  # Match rm's return code.
+fi
+
+# Join file list with commas, and tell Finder to trash that list.
+local file_list="${(pj., .)files}"
+osascript 2>&1 > /dev/null -e "tell app \"Finder\" to move { "${file_list}" } to trash"
+
+# }
diff --git a/modules/python/README.md b/modules/python/README.md
index 2e3b2ee..b7a3230 100644
--- a/modules/python/README.md
+++ b/modules/python/README.md
@@ -2,9 +2,6 @@
 
 Enables local Python and local Python package installation.
 
-This module must be loaded _before_ the _`completion`_ module so that the
-provided completion definitions are loaded.
-
 ## Settings
 
 This module supports virtual environments from conda and
@@ -13,7 +10,7 @@ disable _virtualenvwrapper_, add the following to
 _`${ZDOTDIR:-$HOME}/.zpreztorc`_.
 
 ```sh
-zstyle ':prezto:module:python' skip-virtualenvwrapper-init 'on'
+zstyle ':prezto:module:python:virtualenv' initialize 'no'
 ```
 
 Conda support can be enabled by adding the following to
diff --git a/modules/screen/init.zsh b/modules/screen/init.zsh
index 4dea566..1a3908d 100644
--- a/modules/screen/init.zsh
+++ b/modules/screen/init.zsh
@@ -22,7 +22,7 @@ if [[ -z "$STY" && -z "$EMACS" && -z "$VIM" ]] && ( \
   session="$(
     screen -list 2> /dev/null \
       | sed '1d;$d' \
-      | awk '{print $1}' \
+      | awk '!/Dead/ {print $1}' \
       | head -1)"
 
   if [[ -n "$session" ]]; then
diff --git a/modules/ssh/init.zsh b/modules/ssh/init.zsh
index f870997..6bf237c 100644
--- a/modules/ssh/init.zsh
+++ b/modules/ssh/init.zsh
@@ -16,8 +16,8 @@ _ssh_dir="$HOME/.ssh"
 # Set the path to the environment file if not set by another module.
 _ssh_agent_env="${_ssh_agent_env:-${XDG_CACHE_HOME:-$HOME/.cache}/prezto/ssh-agent.env}"
 
-# Set the path to the persistent authentication socket.
-_ssh_agent_sock="${XDG_CACHE_HOME:-$HOME/.cache}/prezto/ssh-agent.sock"
+# Set the path to the persistent authentication socket if not set by another module.
+_ssh_agent_sock="${_ssh_agent_sock:-${XDG_CACHE_HOME:-$HOME/.cache}/prezto/ssh-agent.sock}"
 
 # Start ssh-agent if not started.
 if [[ ! -S "$SSH_AUTH_SOCK" ]]; then
diff --git a/modules/utility/init.zsh b/modules/utility/init.zsh
index e10c4fe..5b4bf80 100644
--- a/modules/utility/init.zsh
+++ b/modules/utility/init.zsh
@@ -88,7 +88,7 @@ if [[ ${(@M)${(f)"$(ls --version 2>&1)"}:#*(GNU|lsd) *} ]]; then
     if (( ! $+LS_COLORS )); then
       # Try dircolors when available
       if is-callable 'dircolors'; then
-        eval "$(dircolors --sh $HOME/.dir_colors(.N))"
+        eval "$(dircolors --sh $HOME/.dir_colors(N))"
       else
         export LS_COLORS='di=34:ln=35:so=32:pi=33:ex=31:bd=36;01:cd=33;01:su=31;40;07:sg=36;40;07:tw=32;40;07:ow=33;40;07:'
       fi