diff --git a/.github/workflows/dev_labeler.yml b/.github/workflows/dev_labeler.yml
index dbdaae8ddba..3cd0f44e781 100644
--- a/.github/workflows/dev_labeler.yml
+++ b/.github/workflows/dev_labeler.yml
@@ -16,8 +16,10 @@
 # under the License.
 
 name: PR labeler
-on:
-- pull_request_target
+on: pull_request_target
+  types: [opened, reopened]
+  paths:
+    - 'rust/**'
 
 jobs:
   assign-rust-labels:
diff --git a/.github/workflows/dev_labeler/labeler.yml b/.github/workflows/dev_labeler/labeler.yml
index 679f46b3525..1753caa733f 100644
--- a/.github/workflows/dev_labeler/labeler.yml
+++ b/.github/workflows/dev_labeler/labeler.yml
@@ -18,5 +18,5 @@
 lang-rust:
   - rust/**/*
 
-datafusion: 
+datafusion:
   - rust/datafusion/**/*
diff --git a/.github/workflows/r.yml b/.github/workflows/r.yml
index 29ffd444370..6f782c22063 100644
--- a/.github/workflows/r.yml
+++ b/.github/workflows/r.yml
@@ -53,7 +53,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        r: ["3.6", "4.0"]
+        r: ["3.6"]
         ubuntu: [18.04]
     env:
       R: ${{ matrix.r }}
@@ -100,7 +100,7 @@ jobs:
       fail-fast: false
       matrix:
         # See https://hub.docker.com/r/rstudio/r-base
-        r_version: ["3.6", "4.0"]
+        r_version: ["4.0"]
         r_image:
           - centos7
     env: