diff --git a/.github/workflows/debian9.yml b/.github/workflows/debian9.yml
index 1d6fa66..498bff7 100644
--- a/.github/workflows/debian9.yml
+++ b/.github/workflows/debian9.yml
@@ -6,6 +6,8 @@
 # See also analysis at: https://github.com/ooni/backend/issues/446#issuecomment-697172389
 #
 # Status as of 2020-11-13: https://github.com/ooni/backend/issues/461#issuecomment-726587481.
+#
+# See comments below for more info.
 name: debian9
 on:
   pull_request:
@@ -21,10 +23,9 @@ jobs:
       fail-fast: false
       matrix:
         version:
-        - "ooniprobe_2.0.2" # (< 1%) re-added on 2020-12-07 for investigation purposes
-        - "ooniprobe_2.1.0" # ~36% of measurements as of 2021-03-04
-        - "ooniprobe_2.2.0" # ~4.5% of measurements as of 2021-03-04
-        - "ooniprobe_2.3.0" # ~11% of measurements as of 2021-03-04
+        - "ooniprobe_2.1.0" # ~34% of measurements as of 2021-04-07
+        - "ooniprobe_2.2.0" # ~4.3% of measurements as of 2021-04-07
+        - "ooniprobe_2.3.0" # ~7.5% of measurements as of 2021-03-04
     steps:
       - uses: actions/setup-go@v1
         with:
diff --git a/.github/workflows/linuxmk0.10.11.yml b/.github/workflows/linuxmk0.10.11.yml
index 816eb73..7ba34c3 100644
--- a/.github/workflows/linuxmk0.10.11.yml
+++ b/.github/workflows/linuxmk0.10.11.yml
@@ -4,7 +4,7 @@
 #
 # See also analysis at https://github.com/ooni/backend/issues/446#issuecomment-697172389.
 #
-# We still see 1% of measurements as of 2021-03-04 coming from
+# We still see 1% of measurements as of 2021-04-07 coming from
 # cli v3.0.0. which includes MK v0.10.11.
 name: libmk0.10.11
 on:
diff --git a/.github/workflows/probecli.yml b/.github/workflows/probecli.yml
index 5619411..a0c70eb 100644
--- a/.github/workflows/probecli.yml
+++ b/.github/workflows/probecli.yml
@@ -13,8 +13,9 @@ jobs:
       fail-fast: false
       matrix:
         version:
-        - "v3.5.2"  # cli v3.5.2 [2021-03-04; 15.99%]
-        - "v3.5.1"  # android v2.9.3 [2021-03-04; 5.95%]
+        - "v3.9.0"  # cli v3.9.0 [2021-04-07; 1.3%]
+        - "v3.8.0"  # cli v3.8.0 and v2.10.1 [2021-04-07; 8% and 5.2%]
+        - "v3.5.2"  # cli v3.5.2 [2021-04-07; 2.8%]
         options:
         - "-o output/miniooni.jsonl"
         - "--probe-services=https://dvp6h0xblpcqp.cloudfront.net -o output/miniooni.jsonl"
diff --git a/.github/workflows/probeengine1.yml b/.github/workflows/probeengine1.yml
deleted file mode 100644
index cbdfe8b..0000000
--- a/.github/workflows/probeengine1.yml
+++ /dev/null
@@ -1,32 +0,0 @@
-name: "probeengine1"
-on:
-  pull_request:
-  push:
-    branches:
-      - master
-  schedule:
-    - cron: "30 */8 * * *"
-jobs:
-  test:
-    runs-on: "ubuntu-18.04"
-    strategy:
-      fail-fast: false
-      matrix:
-        version:
-        - "v0.18.0"  # cli v3.0.9 [2021-03-04; ~0% remove next time]
-        options:
-        - "-o output/miniooni.jsonl"
-        - "--probe-services=https://dvp6h0xblpcqp.cloudfront.net -o output/miniooni.jsonl"
-        - "--probe-services=https://ams-pg-test.ooni.org -o output/miniooni.jsonl"
-    steps:
-      - uses: actions/setup-go@v1
-        with:
-          go-version: "1.14"
-      - uses: actions/checkout@v2
-      - run: git clone https://github.com/ooni/probe-engine
-      - run: cd probe-engine && git checkout "${{ matrix.version }}"
-      - run: cd probe-engine && go build -o ../miniooni -v ./cmd/miniooni
-      - run: ./miniooni ${{ matrix.options }} -i http://mail.google.com web_connectivity
-      - run: ./miniooni ${{ matrix.options }} tor
-      - run: ./miniooni ${{ matrix.options }} psiphon
-      - run: go run ./script/postprocess.go -expected 3
diff --git a/.github/workflows/probeengine2.yml b/.github/workflows/probeengine2.yml
index 722659f..bb508f8 100644
--- a/.github/workflows/probeengine2.yml
+++ b/.github/workflows/probeengine2.yml
@@ -16,7 +16,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-        - "v0.16.0" # 1.13% of measurements (cli v3.0.7-beta.1) [2021-03-04]
+        - "v0.16.0" # 0.56% of measurements (cli v3.0.7-beta.1) [2021-04-07]
         options:
         - "-o output/miniooni.jsonl"
         - "--probe-services-url=https://ams-pg-test.ooni.org/ -o output/miniooni.jsonl"
diff --git a/.github/workflows/probeengine3.yml b/.github/workflows/probeengine3.yml
index 909d937..812a750 100644
--- a/.github/workflows/probeengine3.yml
+++ b/.github/workflows/probeengine3.yml
@@ -16,7 +16,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-        - "v0.10.0" # 1% of measurements as of 2021-03-21 (cli v3.0.0)
+        - "v0.10.0" # ~1% of measurements as of 2021-04-07 (cli v3.0.0)
         options:
         - "-o output/miniooni.jsonl"
         - "--bouncer=https://ams-pg-test.ooni.org/ -o output/miniooni.jsonl"