diff --git a/.github/workflows/build-psql.yml b/.github/workflows/build-psql.yml
index e6bbbab0..cebe1d8c 100644
--- a/.github/workflows/build-psql.yml
+++ b/.github/workflows/build-psql.yml
@@ -11,7 +11,7 @@ jobs:
 
     services:
       postgres:
-        image: postgres
+        image: postgres:17
         env:
           POSTGRES_PASSWORD: postgres
         options: >-
diff --git a/.github/workflows/concepts-psql.yml b/.github/workflows/concepts-psql.yml
index f89ba244..320342eb 100644
--- a/.github/workflows/concepts-psql.yml
+++ b/.github/workflows/concepts-psql.yml
@@ -12,7 +12,7 @@ jobs:
 
     services:
       postgres:
-        image: postgres
+        image: postgres:17
         env:
           POSTGRES_PASSWORD: postgres
         options: >-
diff --git a/.github/workflows/equivalence.yml b/.github/workflows/equivalence.yml
index 0f41bda2..e47c1a14 100644
--- a/.github/workflows/equivalence.yml
+++ b/.github/workflows/equivalence.yml
@@ -16,7 +16,7 @@ jobs:
 
     services:
       postgres:
-        image: postgres
+        image: postgres:17
         env:
           POSTGRES_PASSWORD: postgres
         options: >-
diff --git a/.github/workflows/sqlite.yml b/.github/workflows/sqlite.yml
index 97c583a6..e4867604 100644
--- a/.github/workflows/sqlite.yml
+++ b/.github/workflows/sqlite.yml
@@ -7,7 +7,7 @@ jobs:
   mimic-iv-sqlite:
     # only run if PR is approved
     if: github.event.review.state == 'approved'
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     container: python:3.10
 
     steps: