diff --git a/.github/workflows/abicheck.yml b/.github/workflows/abicheck.yml
index 3ac39146..6149f050 100644
--- a/.github/workflows/abicheck.yml
+++ b/.github/workflows/abicheck.yml
@@ -4,7 +4,7 @@ env:
   build_options: -Dbuildtype=debug -Denable-true-color=yes -Dwith-proxy=yes -Dc_args=-DPERL_EUPXS_ALWAYS_EXPORT
   prefix: /usr/local
   apt_build_deps: ninja-build libutf8proc-dev libperl-dev libotr5-dev
-  get_pip_build_deps: pip3 install setuptools; pip3 install wheel; pip3 install 'meson<0.59.0'
+  get_pip_build_deps: pip3 install 'setuptools<66'; pip3 install wheel; pip3 install 'meson<0.59.0'
   getabidef_def: getabidef() { awk '$1=="#define" && $2=="IRSSI_ABI_VERSION" { print $3 }' "$1"/include/irssi/src/common.h; }
 jobs:
   build-base-ref:
diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 2fee4b8b..c771504e 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -38,6 +38,7 @@ jobs:
         builder: [meson]
         compiler: [clang, gcc]
         flags: [regular]
+        setuptools_ver: [<66]
         include:
           - os: ubuntu-20.04
             builder: meson