diff --git a/ci/conda/environments/clang_env.yml b/ci/conda/environments/clang_env.yml
index 9c8867ae4..50d6cc655 100644
--- a/ci/conda/environments/clang_env.yml
+++ b/ci/conda/environments/clang_env.yml
@@ -19,11 +19,11 @@ name: mrc
 channels:
     - conda-forge
 dependencies:
-    - clang=15
-    - clang-tools=15
-    - clangdev=15
-    - clangxx=15
-    - libclang=15
-    - libclang-cpp=15
-    - llvmdev=15
-    - include-what-you-use=0.19
+    - clang=16
+    - clang-tools=16
+    - clangdev=16
+    - clangxx=16
+    - libclang=16
+    - libclang-cpp=16
+    - llvmdev=16
+    - include-what-you-use
diff --git a/ci/conda/environments/dev_env.yml b/ci/conda/environments/dev_env.yml
index 5af8a91c9..58d83d9a7 100644
--- a/ci/conda/environments/dev_env.yml
+++ b/ci/conda/environments/dev_env.yml
@@ -25,7 +25,7 @@ dependencies:
   - autoconf>=2.69
   - bash-completion
   - benchmark=1.6.0
-  - boost-cpp=1.82
+  - boost-cpp=1.74
   - ccache
   - cmake=3.24
   - cuda-toolkit # Version comes from the channel above
@@ -46,7 +46,7 @@ dependencies:
   - isort
   - jinja2=3.0
   - lcov=1.15
-  - libhwloc=2.9.2
+  - libhwloc=2.5
   - libprotobuf=3.21
   - librmm=23.06
   - libtool