diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 982369e..31c1808 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -46,7 +46,7 @@ jobs:
       fail-fast: false
       matrix:
         php: [ '7.4', '8.1', '8.3' ]
-        mediawiki: [ REL1_39, REL1_43 ]
+        mediawiki: [ REL1_43 ]
         # Ideally we would also add Phan for MW 1.35 and PHP 7.4, but it
         # crashes when analyzing the AlwaysSafeRunner.php file and that version
         # of phan is so old (3.2.6) that it isn't going to be supported
@@ -54,11 +54,6 @@ jobs:
           # MW 1.43 requires PHP 8.1+
           - php: '7.4'
             mediawiki: REL1_43
-          # MW 1.39 requires mediawiki/mediawiki-phan-config@0.12.1 which
-          # requires mediawiki/phan-taint-check-plugin@4.0.0 which crashes
-          # on PHP 8.2+ due to use of deprecated string interpolation
-          - php: '8.3'
-            mediawiki: REL1_39
     steps:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
@@ -115,7 +110,7 @@ jobs:
       fail-fast: false
       matrix:
         php: [ '7.4', '8.1', '8.3' ]
-        mediawiki: [ REL1_39, REL1_43 ]
+        mediawiki: [ REL1_43 ]
         include:
           # Only test MW 1.35 with PHP 7.4
           - php: '7.4'