diff --git a/.github/workflows/32-bit-linux.yml b/.github/workflows/32-bit-linux.yml
index 8c9f0b594f321..cf8a0fe0da91c 100644
--- a/.github/workflows/32-bit-linux.yml
+++ b/.github/workflows/32-bit-linux.yml
@@ -5,12 +5,10 @@ on:
     branches:
       - main
       - 1.5.x
-      - 1.4.x
   pull_request:
     branches:
       - main
       - 1.5.x
-      - 1.4.x
     paths-ignore:
       - "doc/**"
 
diff --git a/.github/workflows/code-checks.yml b/.github/workflows/code-checks.yml
index 6aff77c708378..738263369409c 100644
--- a/.github/workflows/code-checks.yml
+++ b/.github/workflows/code-checks.yml
@@ -5,12 +5,10 @@ on:
     branches:
       - main
       - 1.5.x
-      - 1.4.x
   pull_request:
     branches:
       - main
       - 1.5.x
-      - 1.4.x
 
 env:
   ENV_FILE: environment.yml
diff --git a/.github/workflows/docbuild-and-upload.yml b/.github/workflows/docbuild-and-upload.yml
index cfb4966847721..48a08d4febbaf 100644
--- a/.github/workflows/docbuild-and-upload.yml
+++ b/.github/workflows/docbuild-and-upload.yml
@@ -5,14 +5,12 @@ on:
     branches:
       - main
       - 1.5.x
-      - 1.4.x
     tags:
       - '*'
   pull_request:
     branches:
       - main
       - 1.5.x
-      - 1.4.x
 
 env:
   ENV_FILE: environment.yml
diff --git a/.github/workflows/macos-windows.yml b/.github/workflows/macos-windows.yml
index 63c065fa3d701..81c798c9d86c3 100644
--- a/.github/workflows/macos-windows.yml
+++ b/.github/workflows/macos-windows.yml
@@ -5,12 +5,10 @@ on:
     branches:
       - main
       - 1.5.x
-      - 1.4.x
   pull_request:
     branches:
       - main
       - 1.5.x
-      - 1.4.x
     paths-ignore:
       - "doc/**"
 
diff --git a/.github/workflows/python-dev.yml b/.github/workflows/python-dev.yml
index b725f6812bc3b..7c4b36dab109d 100644
--- a/.github/workflows/python-dev.yml
+++ b/.github/workflows/python-dev.yml
@@ -25,12 +25,10 @@ on:
     branches:
       - main
       - 1.5.x
-      - 1.4.x
   pull_request:
     branches:
       - main
       - 1.5.x
-      - 1.4.x
     paths-ignore:
       - "doc/**"
 
diff --git a/.github/workflows/sdist.yml b/.github/workflows/sdist.yml
index 7c20545105009..9957fc72e9f51 100644
--- a/.github/workflows/sdist.yml
+++ b/.github/workflows/sdist.yml
@@ -5,12 +5,10 @@ on:
     branches:
       - main
       - 1.5.x
-      - 1.4.x
   pull_request:
     branches:
       - main
       - 1.5.x
-      - 1.4.x
     types: [labeled, opened, synchronize, reopened]
     paths-ignore:
       - "doc/**"
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 072e2523c9727..69bde1d812e07 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -5,12 +5,10 @@ on:
     branches:
       - main
       - 1.5.x
-      - 1.4.x
   pull_request:
     branches:
       - main
       - 1.5.x
-      - 1.4.x
     paths-ignore:
       - "doc/**"