diff --git a/.github/workflows/docs.yaml b/.github/workflows/docs.yaml
index 2b5a51377a..daf7c3a446 100644
--- a/.github/workflows/docs.yaml
+++ b/.github/workflows/docs.yaml
@@ -8,7 +8,7 @@ jobs:
   docs:
     name: Generate docs (upon new release)
     runs-on: ubuntu-latest
-    container: hexpm/elixir:1.17.3-erlang-27.1-alpine-3.20.3
+    container: hexpm/elixir:1.17.3-erlang-27.1.2-alpine-3.20.3
     # TODO: compute this ^ from .tool-versions.env
     env:
       FLAVOUR: classic
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index a3c3bab2d4..d0c057792c 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -21,7 +21,7 @@ jobs:
       FLAVOUR: ${{ matrix.flavour }}
       DOCKER_REPO: bonfire
       ALPINE_VERSION: "3.20.3" 
-      ERLANG_VERSION: "27.1"
+      ERLANG_VERSION: "27.1.2"
       ELIXIR_VERSION: "1.17.3"
       # TODO: read these ^ from .tool-versions.env
       WITH_IMAGE_VIX: "0"
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 70950594f1..0f0a3982ae 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         flavour: ['classic'] # 'community', 'cooperation'
-        otp: ['27.1', '25.2.3'] 
+        otp: ['27.1.2', '25.2.3'] 
         elixir: ['1.17.3'] # '1.14.5' 
         test_only: ['backend', 'ui'] # 'federation' - FIXME: federation results in  (Ecto.ConstraintError) constraint error when attempting to insert struct: "bonfire_data_access_control_encircle_circle_id_fkey" (foreign_key_constraint) in `fake_user` 
         # ^ test with latest versions + oldest supported (i.e. versions available in debian stable)
diff --git a/.tool-versions b/.tool-versions
index 34af46385a..2d1234b401 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,6 +1,6 @@
 # You can use asdf or [mise](https://mise.jdx.dev/) to install these
 # NOTE: see upgrade instructions in .tool-versions.env
-erlang       27.1
+erlang       27.1.2
 elixir       1.17.3-otp-27
 # erlang       25.3.2.8
 # elixir       1.13.4-otp-25
diff --git a/.tool-versions.env b/.tool-versions.env
index 43a38f906d..aa2b9da780 100644
--- a/.tool-versions.env
+++ b/.tool-versions.env
@@ -8,4 +8,4 @@
 # The version of Alpine to use for the final image - should match a version used in the Elixir docker image, which can be checked on Docker Hub: https://hub.docker.com/r/hexpm/elixir/tags?name=alpine
 ALPINE_VERSION="3.20.3"
 ELIXIR_VERSION="1.17.3"
-ERLANG_VERSION="27.1"
+ERLANG_VERSION="27.1.2"