diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index fa41ec2..5ce2beb 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -27,8 +27,6 @@ jobs:
           - { os: ubuntu-latest, r: "devel", http-user-agent: "release" }
           - { os: ubuntu-latest, r: "release" }
           - { os: ubuntu-latest, r: "oldrel-1" }
-          - { os: ubuntu-latest, r: "oldrel-2" }
-          - { os: ubuntu-latest, r: "oldrel-3" }
 
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
diff --git a/DESCRIPTION b/DESCRIPTION
index 9022d8d..2c45d91 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -23,7 +23,7 @@ URL: https://github.com/remlapmot/OneSampleMR,
     https://remlapmot.github.io/OneSampleMR/
 BugReports: https://github.com/remlapmot/OneSampleMR/issues/
 Depends:
-    R (>= 4.1.0)
+    R (>= 4.3)
 Imports:
     ellipsis,
     Formula,
diff --git a/NEWS.md b/NEWS.md
index 3406709..9eacfdb 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -12,6 +12,8 @@
 
 * Made use of ellipsis `...` in several function definitions safer using the **ellipsis** package
 
+* Bumped required version of R to 4.3.0 because the **Matrix** package, which is a dependency of **ivreg** now requires R 4.4.0. CRAN retain a binary version of **Matrix** 1.6-5 for the previous release of R, and so the minimum version of R can be 4.3.0 rather than 4.4.0.
+
 # OneSampleMR 0.1.3
 
 * Update **roxygen2** version used to generate documentation