diff --git a/Dockerfile.dapper b/Dockerfile.dapper
index 216981d9..c735df1e 100644
--- a/Dockerfile.dapper
+++ b/Dockerfile.dapper
@@ -1,4 +1,4 @@
-FROM golang:1.19-alpine3.16 AS dapper
+FROM golang:1.20-alpine3.17 AS dapper
 
 ARG ARCH=amd64
 
diff --git a/Dockerfile.test.dapper b/Dockerfile.test.dapper
index da69b475..56fa4811 100644
--- a/Dockerfile.test.dapper
+++ b/Dockerfile.test.dapper
@@ -1,8 +1,8 @@
-FROM golang:1.19-alpine3.16 AS dapper
+FROM golang:1.20-alpine3.17 AS dapper
 
 ARG ARCH=amd64
 
-RUN apk -U add bash coreutils git gcc musl-dev docker-cli vim less file curl wget ca-certificates
+RUN apk -U add bash ca-certificates coreutils curl docker-cli file findutils gcc git less musl-dev vim wget
 RUN apk -U add py3-pip && pip install kubernetes termplotlib==v0.3.4
 
 ENV DAPPER_RUN_ARGS --privileged -v kine-cache:/go/src/github.com/k3s-io/kine/.cache
diff --git a/scripts/test-helpers b/scripts/test-helpers
index 9e5a482c..7e291784 100755
--- a/scripts/test-helpers
+++ b/scripts/test-helpers
@@ -114,13 +114,12 @@ export -f run-test
 
 # ---
 
-inc-count() {(
-    shopt -s extglob
-    local count=$(exec 2>/dev/null; ls -1d $TEST_DIR/$1/+([0-9]) | xargs -n1 basename | sort -n -r | head -1)
+inc-count() {
+    local count=$(find $TEST_DIR -mindepth 2 -maxdepth 2 -type d -regex ".*/$1/[0-9]+" -printf '%f\n' | sort -nr | head -1)
     count=$((count+1))
     mkdir -p $TEST_DIR/$1/$count/metadata
     echo $count
-)}
+}
 export -f inc-count
 
 # ---