diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index 0f2fe08..f4a4f91 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -22,9 +22,8 @@ jobs:
         config:
           - {os: macos-latest,   r: 'release'}
           - {os: windows-latest, r: 'release'}
-          - {os: ubuntu-latest,   r: 'devel', http-user-agent: 'release'}
-          - {os: ubuntu-latest,   r: 'release'}
-          - {os: ubuntu-latest,   r: 'oldrel-1'}
+          - {os: ubuntu-latest,  r: 'release'}
+          - {os: ubuntu-latest,  r: 'devel', http-user-agent: 'release'}
 
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/R-CMD-tests.yaml b/.github/workflows/R-CMD-tests.yaml
index 81c0b8d..76fb3eb 100644
--- a/.github/workflows/R-CMD-tests.yaml
+++ b/.github/workflows/R-CMD-tests.yaml
@@ -22,9 +22,8 @@ jobs:
         config:
           - {os: macos-latest,   r: 'release'}
           - {os: windows-latest, r: 'release'}
-          - {os: ubuntu-latest,   r: 'devel', http-user-agent: 'release'}
-          - {os: ubuntu-latest,   r: 'release'}
-          - {os: ubuntu-latest,   r: 'oldrel-1'}
+          - {os: ubuntu-latest,  r: 'release'}
+          - {os: ubuntu-latest,  r: 'devel', http-user-agent: 'release'}
 
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
diff --git a/tests/testthat/_snaps/zcurve/z-curve-kd2-ggplot.svg b/tests/testthat/_snaps/zcurve/z-curve-kd2-ggplot.svg
index 83ea8dc..32ca38d 100644
--- a/tests/testthat/_snaps/zcurve/z-curve-kd2-ggplot.svg
+++ b/tests/testthat/_snaps/zcurve/z-curve-kd2-ggplot.svg
@@ -56,10 +56,10 @@
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diff --git a/tests/testthat/test-zcurve.R b/tests/testthat/test-zcurve.R
index e8a45eb..62e3606 100644
--- a/tests/testthat/test-zcurve.R
+++ b/tests/testthat/test-zcurve.R
@@ -79,7 +79,7 @@ test_that("z-curve KD2 can be fitted and reproduces OSC results", {
       ""                                                       ,
       "Estimates:"                                             ,
       "      ERR       EDR "                                   ,
-      "0.6133950 0.5064392 "    
+      "0.6133975 0.5064694 "    
     ))
   
   # basic summary
@@ -94,7 +94,7 @@ test_that("z-curve KD2 can be fitted and reproduces OSC results", {
       "ERR    0.613 0.496 0.745"                                                                ,
       "EDR    0.506 0.141 0.714"                                                                ,
       ""                                                                                        ,
-      "Model converged in 47 iterations"                                                        ,
+      "Model converged in 46 iterations"                                                        ,
       "Fitted using 73 z-values. 90 supplied, 85 significant (ODR = 0.94, 95% CI [0.87, 0.98]).",
       "RMSE = 0.11, 95% CI[0.09, 0.19]"
     ))