diff --git a/gnu/tests/docker.scm b/gnu/tests/docker.scm
index 3f98a1e316..10882b9d1f 100644
--- a/gnu/tests/docker.scm
+++ b/gnu/tests/docker.scm
@@ -171,7 +171,7 @@ (define (build-tarball&run-docker-test)
           (home-page #f)
           (license license:public-domain)))
        (profile (profile-derivation (packages->manifest
-                                     (list guile-2.2 guile-json
+                                     (list guile-2.2 guile-json-3
                                            guest-script-package))
                                     #:hooks '()
                                     #:locales? #f))
diff --git a/gnu/tests/singularity.scm b/gnu/tests/singularity.scm
index 2f3a6f289d..1fc2773a00 100644
--- a/gnu/tests/singularity.scm
+++ b/gnu/tests/singularity.scm
@@ -138,7 +138,7 @@ (define (build-tarball&run-singularity-test)
        ;; 'singularity exec' insists on having /bin/sh in the image.
        (profile  (profile-derivation (packages->manifest
                                       (list bash-minimal
-                                            guile-2.2 guile-json))
+                                            guile-2.2 guile-json-3))
                                      #:hooks '()
                                      #:locales? #f))
        (tarball  (squashfs-image "singularity-pack" profile