diff --git a/tests/testthat/test-condition-pr-matrix.R b/tests/testthat/test-condition-pr-matrix.R
index 01cb9d3..69bda84 100644
--- a/tests/testthat/test-condition-pr-matrix.R
+++ b/tests/testthat/test-condition-pr-matrix.R
@@ -25,6 +25,7 @@ test_that("Complete randomization", {
 })
 
 test_that("declaration to condition_pr_mat errors", {
+  skip_if_not_installed("randomizr")
 
   expect_error(
     declaration_to_condition_pr_mat(randomizr::declare_ra(N = n), 1, NULL),
@@ -41,6 +42,7 @@ test_that("declaration to condition_pr_mat errors", {
 })
 
 test_that("condition args work properly", {
+  skip_if_not_installed("randomizr")
 
   # Condition args work properly
   mat01 <- declaration_to_condition_pr_mat(
@@ -61,6 +63,7 @@ test_that("condition args work properly", {
 })
 
 test_that("Complete randomization with number of treated units not fixed", {
+  skip_if_not_installed("randomizr")
 
   #
   comp_odd_ra <- randomizr::declare_ra(N = 3, prob = 0.5)
@@ -83,6 +86,7 @@ test_that("Complete randomization with number of treated units not fixed", {
 })
 
 test_that("Complete randomization with non 0.5 as remainder", {
+  skip_if_not_installed("randomizr")
   comp_odd_ra <- randomizr::declare_ra(N = 3, prob = 0.4)
   decl_cond_pr_mat <- declaration_to_condition_pr_mat(comp_odd_ra)
 
@@ -95,6 +99,7 @@ test_that("Complete randomization with non 0.5 as remainder", {
   )
 })
 test_that("Simple ra", {
+  skip_if_not_installed("randomizr")
 
   # Simple randomization
   prs <- rep(0.4, times = n)
@@ -113,6 +118,7 @@ test_that("Simple ra", {
   )
 })
 test_that("Blocked complete ra", {
+  skip_if_not_installed("randomizr")
 
   # Blocked case
   dat <- data.frame(
@@ -129,6 +135,8 @@ test_that("Blocked complete ra", {
   )
 })
 test_that("Blocked complete ra with remainder", {
+  skip_if_not_installed("randomizr")
+
   dat <- data.frame(
     bl = c("A", "B", "A", "B", "B", "B"),
     pr = c(0.5, 0.25, 0.5, 0.25, 0.25, 0.25)
@@ -147,6 +155,7 @@ test_that("Blocked complete ra with remainder", {
   )
 })
 test_that("Clustered complete ra", {
+  skip_if_not_installed("randomizr")
 
   # Cluster complete case
   dat <- data.frame(
@@ -173,6 +182,7 @@ test_that("Clustered complete ra", {
 })
 
 test_that("Clustered ra", {
+  skip_if_not_installed("randomizr")
 
   # Cluster simple ? Should this be simple or no? --NJF
   dat <- data.frame(
@@ -204,6 +214,7 @@ test_that("Clustered ra", {
 })
 
 test_that("Blocked and Clustered ra", {
+  skip_if_not_installed("randomizr")
 
   # Blocked and clustered
   dat <- data.frame(
@@ -221,6 +232,7 @@ test_that("Blocked and Clustered ra", {
 })
 
 test_that("Blocked and clusted ra with remainder", {
+  skip_if_not_installed("randomizr")
 
   # with remainder
   dat <- data.frame(
@@ -238,6 +250,8 @@ test_that("Blocked and clusted ra with remainder", {
 })
 
 test_that("Custom ra", {
+  skip_if_not_installed("randomizr")
+
   cust_perms <- cbind(c(1, 0, 1, 0), c(1, 1, 0, 0))
   cust_ra <- randomizr::declare_ra(permutation_matrix = cust_perms)
 
@@ -248,6 +262,7 @@ test_that("Custom ra", {
 })
 
 test_that("Errors for things that we can't support", {
+  skip_if_not_installed("randomizr")
 
   #
   # multiple armed experiments
@@ -275,6 +290,8 @@ test_that("Errors for things that we can't support", {
 })
 
 test_that("probability not fixed within blocks", {
+  skip_if_not_installed("randomizr")
+
   bl_small <- randomizr::declare_ra(
     blocks = c(1, 1, 2, 2),
     prob = 0.4
@@ -295,6 +312,7 @@ test_that("probability not fixed within blocks", {
 })
 
 test_that("N=2, m=1", {
+  skip_if_not_installed("randomizr")
 
   comp <- randomizr::declare_ra(N = 2, m = 1)
   assign(
diff --git a/tests/testthat/test-difference-in-means.R b/tests/testthat/test-difference-in-means.R
index a0f4d08..263c515 100644
--- a/tests/testthat/test-difference-in-means.R
+++ b/tests/testthat/test-difference-in-means.R
@@ -472,6 +472,8 @@ test_that("DIM works with character args", {
 })
 
 test_that("DIM unbiased", {
+  skip_if_not_installed("randomizr")
+
   dat <- data.frame(
     i = 1:10,
     Y0 = c(
diff --git a/tests/testthat/test-horvitz-thompson.R b/tests/testthat/test-horvitz-thompson.R
index d89eca2..f9d803e 100644
--- a/tests/testthat/test-horvitz-thompson.R
+++ b/tests/testthat/test-horvitz-thompson.R
@@ -26,6 +26,8 @@ test_that("Horvitz-Thompson matches d-i-m under certain conditions", {
 })
 
 test_that("Horvitz-Thompson works in simple case", {
+  skip_if_not_installed("randomizr")
+
   n <- 40
   dat <- data.frame(
     y = rnorm(n)
@@ -167,6 +169,8 @@ test_that("Horvitz-Thompson works in simple case", {
 })
 
 test_that("Horvitz-Thompson works with clustered data", {
+  skip_if_not_installed("randomizr")
+
   n <- 8
   dat <- data.frame(
     y = rnorm(n),
@@ -339,6 +343,8 @@ test_that("Horvitz-Thompson works with clustered data", {
 })
 
 test_that("Horvitz-Thompson works with missingness", {
+  skip_if_not_installed("randomizr")
+
   n <- 40
   dat <- data.frame(
     y = rnorm(n),
@@ -386,6 +392,8 @@ test_that("Horvitz-Thompson works with missingness", {
 
 # test blocks in the data
 test_that("Estimating Horvitz-Thompson can be done two ways with blocks", {
+  skip_if_not_installed("randomizr")
+
   n <- 40
   dat <- data.frame(
     y = rnorm(n),
@@ -449,6 +457,8 @@ test_that("Estimating Horvitz-Thompson can be done two ways with blocks", {
 
 # errors when arguments are passed that shouldn't be together
 test_that("Horvitz-Thompson properly checks arguments and data", {
+  skip_if_not_installed("randomizr")
+
   n <- 8
   dat <- data.frame(
     y = rnorm(n),
@@ -618,6 +628,8 @@ test_that("Works without variation in treatment", {
 })
 
 test_that("multi-valued treatments not allowed in ra_declaration", {
+  skip_if_not_installed("randomizr")
+
   dat <- data.frame(
     y = rnorm(20),
     ps = 0.4
diff --git a/tests/testthat/test-lm-cluster.R b/tests/testthat/test-lm-cluster.R
index 2f1a432..5c1ced3 100644
--- a/tests/testthat/test-lm-cluster.R
+++ b/tests/testthat/test-lm-cluster.R
@@ -63,6 +63,7 @@ test_that("lm cluster se", {
 
   lm_interact_simple <- lm(Y ~ Z * X, data = dat)
 
+  skip_if_not_installed("sandwich")
   bm_interact <-
     BMlmSE(
       lm_interact_simple,
@@ -357,6 +358,8 @@ test_that("lm works with quoted or unquoted vars and withor without factor clust
 })
 
 test_that("Clustered SEs work with clusters of size 1", {
+  skip_if_not_installed("sandwich")
+
   dat <- data.frame(
     Y = rnorm(100),
     X = rnorm(100),
diff --git a/tests/testthat/test-lm-robust.R b/tests/testthat/test-lm-robust.R
index 6c774d7..cce4285 100644
--- a/tests/testthat/test-lm-robust.R
+++ b/tests/testthat/test-lm-robust.R
@@ -569,6 +569,7 @@ test_that("multiple outcomes", {
     vcov(lmro)
   )
 
+  skip_if_not_installed("sandwich")
   for (se_type in setdiff(se_types, "classical")) {
     expect_equal(
       sandwich::vcovHC(lmo, type = se_type),
diff --git a/tests/testthat/test-replicate-HT-middleton.R b/tests/testthat/test-replicate-HT-middleton.R
index 5885e17..046ca91 100644
--- a/tests/testthat/test-replicate-HT-middleton.R
+++ b/tests/testthat/test-replicate-HT-middleton.R
@@ -1,6 +1,7 @@
 context("Verification - HT matches Joel Middleton code")
 
 test_that("We match Joel's estimator", {
+  skip_if_not_installed("randomizr")
 
   # Code from Joel Middleton
   n <- 400
diff --git a/tests/testthat/test-s3-methods.R b/tests/testthat/test-s3-methods.R
index 49b2a97..97b5496 100644
--- a/tests/testthat/test-s3-methods.R
+++ b/tests/testthat/test-s3-methods.R
@@ -183,6 +183,7 @@ test_that("tidy, glance, summary, and print work", {
   )
 
   ## lh_robust
+  skip_if_not_installed("car")
   lho <- lh_robust(
     mpg ~ cyl + am,
     data = mtcars,
@@ -1078,6 +1079,7 @@ test_that("update works", {
 })
 
 test_that("setting different alpha in lm_robust call leads to different CIs in tidy", {
+  skip_if_not_installed("fabricatr")
 
   set.seed(15)
   library(fabricatr)
@@ -1103,6 +1105,7 @@ test_that("setting different alpha in lm_robust call leads to different CIs in t
 })
 
 test_that("conf int for lh_robust works", {
+  skip_if_not_installed("fabricatr")
 
   set.seed(15)
   library(fabricatr)