diff --git a/srcpkgs/delta/patches/bump-git2.patch b/srcpkgs/delta/patches/downgrade-git2.patch
similarity index 55%
rename from srcpkgs/delta/patches/bump-git2.patch
rename to srcpkgs/delta/patches/downgrade-git2.patch
index 05255c23c9c..2f1e88ea6e3 100644
--- a/srcpkgs/delta/patches/bump-git2.patch
+++ b/srcpkgs/delta/patches/downgrade-git2.patch
@@ -1,12 +1,12 @@
 diff --git a/Cargo.toml b/Cargo.toml
-index 8c0c6d8..4fdaa9d 100644
+index d55c68e..b80247b 100644
 --- a/Cargo.toml
 +++ b/Cargo.toml
-@@ -46,7 +46,7 @@ vte = "0.11.0"
- xdg = "2.4.1"
+@@ -57,7 +57,7 @@ clap_complete = "4.4.4"
+ terminal-colorsaurus = "0.3.1"
  
  [dependencies.git2]
--version = "0.16.1"
+-version = "0.18.2"
 +version = "0.17"
  default-features = false
  features = []
diff --git a/srcpkgs/delta/template b/srcpkgs/delta/template
index e0e2c44370d..d32063d2489 100644
--- a/srcpkgs/delta/template
+++ b/srcpkgs/delta/template
@@ -1,8 +1,11 @@
 # Template file for 'delta'
 pkgname=delta
-version=0.16.5
-revision=2
+version=0.17.0
+revision=1
 build_style=cargo
+build_helper=qemu
+# https://github.com/dandavison/delta/issues/1637
+make_check_args="-- --test-threads=1"
 hostmakedepends="pkg-config"
 makedepends="libgit2-devel oniguruma-devel"
 checkdepends="git"
@@ -11,12 +14,17 @@ maintainer="Andrew Benson <abenson+void@gmail.com>"
 license="MIT"
 homepage="https://github.com/dandavison/delta"
 distfiles="https://github.com/dandavison/delta/archive/refs/tags/${version}.tar.gz"
-checksum=00d4740e9da4f543f34a2a0503615f8190d307d1180dfb753b6911aa6940197f
+checksum=1abd21587bcc1f2ef0cd342784ce990da9978bc345578e45506419e0952de714
 
 post_patch() {
-	cargo update --package git2@0.16.1 --precise 0.17.2
+	cargo update --package git2@0.18.2 --precise 0.17.2
 }
 
 post_install() {
 	vlicense LICENSE
+
+	for _shell in bash fish zsh; do
+		vtargetrun ${DESTDIR}/usr/bin/delta --generate-completion ${_shell} > delta.${_shell}
+		vcompletion delta.${_shell} ${_shell}
+	done
 }